Attachment 305161 Details for Bug 445348 – mtrr change from bug 438960

[patch] mtrr change from bug 438960

mtrr2.diff (text/plain), 54.11 KB, created by Linda Wang on 2008-05-12 19:17:55 UTC

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Creator: Linda Wang

Created: 2008-05-12 19:17:55 UTC

Size: 54.11 KB

patch

obsolete

>commit 2d2ee8de5f6d26ef2942e0b449aa68d9236d5777
>Author: Paul Jimenez <pj@place.org>
>Date:   Wed Jan 30 13:30:31 2008 +0100
>
>    x86: mtrr use type bool [RESEND AGAIN]
>    
>    This is a janitorish patch to 1) remove private TRUE/FALSE #def's in
>    favor of using the standard enum from linux/stddef.h and 2) switch the
>    variables holding those values to type 'bool' (from linux/types.h)
>    since it both seems more appropriate and allows for potentially better
>    optimization.
>    
>    As a truly minor aside, I removed a couple of comments documenting
>    a 'do_safe' parameter that seems to no longer exist.
>    
>    Signed-off-by: Paul Jimenez <pj@place.org>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/arch/x86/kernel/cpu/mtrr/amd.c b/arch/x86/kernel/cpu/mtrr/amd.c
>index 0949cdb..ee2331b 100644
>--- a/arch/x86/kernel/cpu/mtrr/amd.c
>+++ b/arch/x86/kernel/cpu/mtrr/amd.c
>@@ -53,8 +53,6 @@ static void amd_set_mtrr(unsigned int reg, unsigned long base,
>     <base> The base address of the region.
>     <size> The size of the region. If this is 0 the region is disabled.
>     <type> The type of the region.
>-    <do_safe> If TRUE, do the change safely. If FALSE, safety measures should
>-    be done externally.
>     [RETURNS] Nothing.
> */
> {
>diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
>index 992f08d..1c331c3 100644
>--- a/arch/x86/kernel/cpu/mtrr/generic.c
>+++ b/arch/x86/kernel/cpu/mtrr/generic.c
>@@ -188,7 +188,7 @@ static inline void k8_enable_fixed_iorrs(void)
>  * \param changed pointer which indicates whether the MTRR needed to be changed
>  * \param msrwords pointer to the MSR values which the MSR should have
>  */
>-static void set_fixed_range(int msr, int * changed, unsigned int * msrwords)
>+static void set_fixed_range(int msr, bool *changed, unsigned int *msrwords)
> {
> 	unsigned lo, hi;
> 
>@@ -200,7 +200,7 @@ static void set_fixed_range(int msr, int * changed, unsigned int * msrwords)
> 		    ((msrwords[0] | msrwords[1]) & K8_MTRR_RDMEM_WRMEM_MASK))
> 			k8_enable_fixed_iorrs();
> 		mtrr_wrmsr(msr, msrwords[0], msrwords[1]);
>-		*changed = TRUE;
>+		*changed = true;
> 	}
> }
> 
>@@ -260,7 +260,7 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base,
> static int set_fixed_ranges(mtrr_type * frs)
> {
> 	unsigned long long *saved = (unsigned long long *) frs;
>-	int changed = FALSE;
>+	bool changed = false;
> 	int block=-1, range;
> 
> 	while (fixed_range_blocks[++block].ranges)
>@@ -273,17 +273,17 @@ static int set_fixed_ranges(mtrr_type * frs)
> 
> /*  Set the MSR pair relating to a var range. Returns TRUE if
>     changes are made  */
>-static int set_mtrr_var_ranges(unsigned int index, struct mtrr_var_range *vr)
>+static bool set_mtrr_var_ranges(unsigned int index, struct mtrr_var_range *vr)
> {
> 	unsigned int lo, hi;
>-	int changed = FALSE;
>+	bool changed = false;
> 
> 	rdmsr(MTRRphysBase_MSR(index), lo, hi);
> 	if ((vr->base_lo & 0xfffff0ffUL) != (lo & 0xfffff0ffUL)
> 	    || (vr->base_hi & (size_and_mask >> (32 - PAGE_SHIFT))) !=
> 		(hi & (size_and_mask >> (32 - PAGE_SHIFT)))) {
> 		mtrr_wrmsr(MTRRphysBase_MSR(index), vr->base_lo, vr->base_hi);
>-		changed = TRUE;
>+		changed = true;
> 	}
> 
> 	rdmsr(MTRRphysMask_MSR(index), lo, hi);
>@@ -292,7 +292,7 @@ static int set_mtrr_var_ranges(unsigned int index, struct mtrr_var_range *vr)
> 	    || (vr->mask_hi & (size_and_mask >> (32 - PAGE_SHIFT))) !=
> 		(hi & (size_and_mask >> (32 - PAGE_SHIFT)))) {
> 		mtrr_wrmsr(MTRRphysMask_MSR(index), vr->mask_lo, vr->mask_hi);
>-		changed = TRUE;
>+		changed = true;
> 	}
> 	return changed;
> }
>@@ -417,8 +417,6 @@ static void generic_set_mtrr(unsigned int reg, unsigned long base,
>     <base> The base address of the region.
>     <size> The size of the region. If this is 0 the region is disabled.
>     <type> The type of the region.
>-    <do_safe> If TRUE, do the change safely. If FALSE, safety measures should
>-    be done externally.
>     [RETURNS] Nothing.
> */
> {
>diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
>index c7d8f17..1453568 100644
>--- a/arch/x86/kernel/cpu/mtrr/if.c
>+++ b/arch/x86/kernel/cpu/mtrr/if.c
>@@ -37,7 +37,7 @@ const char *mtrr_attrib_to_str(int x)
> 
> static int
> mtrr_file_add(unsigned long base, unsigned long size,
>-	      unsigned int type, char increment, struct file *file, int page)
>+	      unsigned int type, bool increment, struct file *file, int page)
> {
> 	int reg, max;
> 	unsigned int *fcount = FILE_FCOUNT(file); 
>@@ -55,7 +55,7 @@ mtrr_file_add(unsigned long base, unsigned long size,
> 		base >>= PAGE_SHIFT;
> 		size >>= PAGE_SHIFT;
> 	}
>-	reg = mtrr_add_page(base, size, type, 1);
>+	reg = mtrr_add_page(base, size, type, true);
> 	if (reg >= 0)
> 		++fcount[reg];
> 	return reg;
>@@ -141,7 +141,7 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
> 		size >>= PAGE_SHIFT;
> 		err =
> 		    mtrr_add_page((unsigned long) base, (unsigned long) size, i,
>-				  1);
>+				  true);
> 		if (err < 0)
> 			return err;
> 		return len;
>@@ -217,7 +217,7 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
> 		if (!capable(CAP_SYS_ADMIN))
> 			return -EPERM;
> 		err =
>-		    mtrr_file_add(sentry.base, sentry.size, sentry.type, 1,
>+		    mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
> 				  file, 0);
> 		break;
> 	case MTRRIOC_SET_ENTRY:
>@@ -226,7 +226,7 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
> #endif
> 		if (!capable(CAP_SYS_ADMIN))
> 			return -EPERM;
>-		err = mtrr_add(sentry.base, sentry.size, sentry.type, 0);
>+		err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
> 		break;
> 	case MTRRIOC_DEL_ENTRY:
> #ifdef CONFIG_COMPAT
>@@ -270,7 +270,7 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
> 		if (!capable(CAP_SYS_ADMIN))
> 			return -EPERM;
> 		err =
>-		    mtrr_file_add(sentry.base, sentry.size, sentry.type, 1,
>+		    mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
> 				  file, 1);
> 		break;
> 	case MTRRIOC_SET_PAGE_ENTRY:
>@@ -279,7 +279,8 @@ mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
> #endif
> 		if (!capable(CAP_SYS_ADMIN))
> 			return -EPERM;
>-		err = mtrr_add_page(sentry.base, sentry.size, sentry.type, 0);
>+		err =
>+		    mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
> 		break;
> 	case MTRRIOC_DEL_PAGE_ENTRY:
> #ifdef CONFIG_COMPAT
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index beb45c9..60af5ed 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -311,7 +311,7 @@ static void set_mtrr(unsigned int reg, unsigned long base,
>  */
> 
> int mtrr_add_page(unsigned long base, unsigned long size, 
>-		  unsigned int type, char increment)
>+		  unsigned int type, bool increment)
> {
> 	int i, replace, error;
> 	mtrr_type ltype;
>@@ -394,7 +394,9 @@ int mtrr_add_page(unsigned long base, unsigned long size,
> 		if (likely(replace < 0))
> 			usage_table[i] = 1;
> 		else {
>-			usage_table[i] = usage_table[replace] + !!increment;
>+			usage_table[i] = usage_table[replace];
>+			if (increment)
>+				usage_table[i]++;
> 			if (unlikely(replace != i)) {
> 				set_mtrr(replace, 0, 0, 0);
> 				usage_table[replace] = 0;
>@@ -460,7 +462,7 @@ static int mtrr_check(unsigned long base, unsigned long size)
> 
> int
> mtrr_add(unsigned long base, unsigned long size, unsigned int type,
>-	 char increment)
>+	 bool increment)
> {
> 	if (mtrr_check(base, size))
> 		return -EINVAL;
>diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.h b/arch/x86/kernel/cpu/mtrr/mtrr.h
>index 289dfe6..54347e9 100644
>--- a/arch/x86/kernel/cpu/mtrr/mtrr.h
>+++ b/arch/x86/kernel/cpu/mtrr/mtrr.h
>@@ -2,10 +2,8 @@
>  * local mtrr defines.
>  */
> 
>-#ifndef TRUE
>-#define TRUE  1
>-#define FALSE 0
>-#endif
>+#include <linux/types.h>
>+#include <linux/stddef.h>
> 
> #define MTRRcap_MSR     0x0fe
> #define MTRRdefType_MSR 0x2ff
>diff --git a/include/asm-x86/mtrr.h b/include/asm-x86/mtrr.h
>index e8320e4..262670e 100644
>--- a/include/asm-x86/mtrr.h
>+++ b/include/asm-x86/mtrr.h
>@@ -89,9 +89,9 @@ struct mtrr_gentry
> extern void mtrr_save_fixed_ranges(void *);
> extern void mtrr_save_state(void);
> extern int mtrr_add (unsigned long base, unsigned long size,
>-		     unsigned int type, char increment);
>+		     unsigned int type, bool increment);
> extern int mtrr_add_page (unsigned long base, unsigned long size,
>-		     unsigned int type, char increment);
>+		     unsigned int type, bool increment);
> extern int mtrr_del (int reg, unsigned long base, unsigned long size);
> extern int mtrr_del_page (int reg, unsigned long base, unsigned long size);
> extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
>@@ -101,12 +101,12 @@ extern void mtrr_bp_init(void);
> #define mtrr_save_fixed_ranges(arg) do {} while (0)
> #define mtrr_save_state() do {} while (0)
> static __inline__ int mtrr_add (unsigned long base, unsigned long size,
>-				unsigned int type, char increment)
>+				unsigned int type, bool increment)
> {
>     return -ENODEV;
> }
> static __inline__ int mtrr_add_page (unsigned long base, unsigned long size,
>-				unsigned int type, char increment)
>+				unsigned int type, bool increment)
> {
>     return -ENODEV;
> }
>commit 99fc8d424bc5d803fe92cad56c068fe64e73747a
>Author: Jesse Barnes <jesse.barnes@intel.com>
>Date:   Wed Jan 30 13:33:18 2008 +0100
>
>    x86, 32-bit: trim memory not covered by wb mtrrs
>    
>    On some machines, buggy BIOSes don't properly setup WB MTRRs to cover all
>    available RAM, meaning the last few megs (or even gigs) of memory will be
>    marked uncached.  Since Linux tends to allocate from high memory addresses
>    first, this causes the machine to be unusably slow as soon as the kernel
>    starts really using memory (i.e.  right around init time).
>    
>    This patch works around the problem by scanning the MTRRs at boot and
>    figuring out whether the current end_pfn value (setup by early e820 code)
>    goes beyond the highest WB MTRR range, and if so, trimming it to match.  A
>    fairly obnoxious KERN_WARNING is printed too, letting the user know that
>    not all of their memory is available due to a likely BIOS bug.
>    
>    Something similar could be done on i386 if needed, but the boot ordering
>    would be slightly different, since the MTRR code on i386 depends on the
>    boot_cpu_data structure being setup.
>    
>    This patch fixes a bug in the last patch that caused the code to run on
>    non-Intel machines (AMD machines apparently don't need it and it's untested
>    on other non-Intel machines, so best keep it off).
>    
>    Further enhancements and fixes from:
>    
>      Yinghai Lu <Yinghai.Lu@Sun.COM>
>      Andi Kleen <ak@suse.de>
>    
>    Signed-off-by: Jesse Barnes <jesse.barnes@intel.com>
>    Tested-by: Justin Piszcz <jpiszcz@lucidpixels.com>
>    Cc: Andi Kleen <andi@firstfloor.org>
>    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
>    Cc: Yinghai Lu <yhlu.kernel@gmail.com>
>    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
>index 860a908..b8fadf5 100644
>--- a/Documentation/kernel-parameters.txt
>+++ b/Documentation/kernel-parameters.txt
>@@ -570,6 +570,12 @@ and is between 256 and 4096 characters. It is defined in the file
> 			See drivers/char/README.epca and
> 			Documentation/digiepca.txt.
> 
>+	disable_mtrr_trim [X86-64, Intel only]
>+			By default the kernel will trim any uncacheable
>+			memory out of your available memory pool based on
>+			MTRR settings.  This parameter disables that behavior,
>+			possibly causing your machine to run very slowly.
>+
> 	dmasound=	[HW,OSS] Sound subsystem buffers
> 
> 	dscc4.setup=	[NET]
>diff --git a/arch/x86/kernel/bugs_64.c b/arch/x86/kernel/bugs_64.c
>index 9a189ce..8f520f9 100644
>--- a/arch/x86/kernel/bugs_64.c
>+++ b/arch/x86/kernel/bugs_64.c
>@@ -13,7 +13,6 @@
> void __init check_bugs(void)
> {
> 	identify_cpu(&boot_cpu_data);
>-	mtrr_bp_init();
> #if !defined(CONFIG_SMP)
> 	printk("CPU: ");
> 	print_cpu_info(&boot_cpu_data);
>diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
>index 55d31ff..103d61a 100644
>--- a/arch/x86/kernel/cpu/mtrr/generic.c
>+++ b/arch/x86/kernel/cpu/mtrr/generic.c
>@@ -14,7 +14,7 @@
> #include "mtrr.h"
> 
> struct mtrr_state {
>-	struct mtrr_var_range *var_ranges;
>+	struct mtrr_var_range var_ranges[MAX_VAR_RANGES];
> 	mtrr_type fixed_ranges[NUM_FIXED_RANGES];
> 	unsigned char enabled;
> 	unsigned char have_fixed;
>@@ -86,12 +86,6 @@ void __init get_mtrr_state(void)
> 	struct mtrr_var_range *vrs;
> 	unsigned lo, dummy;
> 
>-	if (!mtrr_state.var_ranges) {
>-		mtrr_state.var_ranges = kmalloc(num_var_ranges * sizeof (struct mtrr_var_range), 
>-						GFP_KERNEL);
>-		if (!mtrr_state.var_ranges)
>-			return;
>-	} 
> 	vrs = mtrr_state.var_ranges;
> 
> 	rdmsr(MTRRcap_MSR, lo, dummy);
>diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
>index 1453568..91e150a 100644
>--- a/arch/x86/kernel/cpu/mtrr/if.c
>+++ b/arch/x86/kernel/cpu/mtrr/if.c
>@@ -11,10 +11,6 @@
> #include <asm/mtrr.h>
> #include "mtrr.h"
> 
>-/* RED-PEN: this is accessed without any locking */
>-extern unsigned int *usage_table;
>-
>-
> #define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
> 
> static const char *const mtrr_strings[MTRR_NUM_TYPES] =
>@@ -397,7 +393,7 @@ static int mtrr_seq_show(struct seq_file *seq, void *offset)
> 	for (i = 0; i < max; i++) {
> 		mtrr_if->get(i, &base, &size, &type);
> 		if (size == 0)
>-			usage_table[i] = 0;
>+			mtrr_usage_table[i] = 0;
> 		else {
> 			if (size < (0x100000 >> PAGE_SHIFT)) {
> 				/* less than 1MB */
>@@ -411,7 +407,7 @@ static int mtrr_seq_show(struct seq_file *seq, void *offset)
> 			len += seq_printf(seq, 
> 				   "reg%02i: base=0x%05lx000 (%4luMB), size=%4lu%cB: %s, count=%d\n",
> 			     i, base, base >> (20 - PAGE_SHIFT), size, factor,
>-			     mtrr_attrib_to_str(type), usage_table[i]);
>+			     mtrr_attrib_to_str(type), mtrr_usage_table[i]);
> 		}
> 	}
> 	return 0;
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index 60af5ed..ccd36ed 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -38,8 +38,8 @@
> #include <linux/cpu.h>
> #include <linux/mutex.h>
> 
>+#include <asm/e820.h>
> #include <asm/mtrr.h>
>-
> #include <asm/uaccess.h>
> #include <asm/processor.h>
> #include <asm/msr.h>
>@@ -47,7 +47,7 @@
> 
> u32 num_var_ranges = 0;
> 
>-unsigned int *usage_table;
>+unsigned int mtrr_usage_table[MAX_VAR_RANGES];
> static DEFINE_MUTEX(mtrr_mutex);
> 
> u64 size_or_mask, size_and_mask;
>@@ -121,13 +121,8 @@ static void __init init_table(void)
> 	int i, max;
> 
> 	max = num_var_ranges;
>-	if ((usage_table = kmalloc(max * sizeof *usage_table, GFP_KERNEL))
>-	    == NULL) {
>-		printk(KERN_ERR "mtrr: could not allocate\n");
>-		return;
>-	}
> 	for (i = 0; i < max; i++)
>-		usage_table[i] = 1;
>+		mtrr_usage_table[i] = 1;
> }
> 
> struct set_mtrr_data {
>@@ -383,7 +378,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
> 			goto out;
> 		}
> 		if (increment)
>-			++usage_table[i];
>+			++mtrr_usage_table[i];
> 		error = i;
> 		goto out;
> 	}
>@@ -391,15 +386,15 @@ int mtrr_add_page(unsigned long base, unsigned long size,
> 	i = mtrr_if->get_free_region(base, size, replace);
> 	if (i >= 0) {
> 		set_mtrr(i, base, size, type);
>-		if (likely(replace < 0))
>-			usage_table[i] = 1;
>-		else {
>-			usage_table[i] = usage_table[replace];
>+		if (likely(replace < 0)) {
>+			mtrr_usage_table[i] = 1;
>+		} else {
>+			mtrr_usage_table[i] = mtrr_usage_table[replace];
> 			if (increment)
>-				usage_table[i]++;
>+				mtrr_usage_table[i]++;
> 			if (unlikely(replace != i)) {
> 				set_mtrr(replace, 0, 0, 0);
>-				usage_table[replace] = 0;
>+				mtrr_usage_table[replace] = 0;
> 			}
> 		}
> 	} else
>@@ -529,11 +524,11 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
> 		printk(KERN_WARNING "mtrr: MTRR %d not used\n", reg);
> 		goto out;
> 	}
>-	if (usage_table[reg] < 1) {
>+	if (mtrr_usage_table[reg] < 1) {
> 		printk(KERN_WARNING "mtrr: reg: %d has count=0\n", reg);
> 		goto out;
> 	}
>-	if (--usage_table[reg] < 1)
>+	if (--mtrr_usage_table[reg] < 1)
> 		set_mtrr(reg, 0, 0, 0);
> 	error = reg;
>  out:
>@@ -593,16 +588,11 @@ struct mtrr_value {
> 	unsigned long	lsize;
> };
> 
>-static struct mtrr_value * mtrr_state;
>+static struct mtrr_value mtrr_state[MAX_VAR_RANGES];
> 
> static int mtrr_save(struct sys_device * sysdev, pm_message_t state)
> {
> 	int i;
>-	int size = num_var_ranges * sizeof(struct mtrr_value);
>-
>-	mtrr_state = kzalloc(size,GFP_ATOMIC);
>-	if (!mtrr_state)
>-		return -ENOMEM;
> 
> 	for (i = 0; i < num_var_ranges; i++) {
> 		mtrr_if->get(i,
>@@ -624,7 +614,6 @@ static int mtrr_restore(struct sys_device * sysdev)
> 				 mtrr_state[i].lsize,
> 				 mtrr_state[i].ltype);
> 	}
>-	kfree(mtrr_state);
> 	return 0;
> }
> 
>@@ -635,6 +624,109 @@ static struct sysdev_driver mtrr_sysdev_driver = {
> 	.resume		= mtrr_restore,
> };
> 
>+#ifdef CONFIG_X86_64
>+static int disable_mtrr_trim;
>+
>+static int __init disable_mtrr_trim_setup(char *str)
>+{
>+	disable_mtrr_trim = 1;
>+	return 0;
>+}
>+early_param("disable_mtrr_trim", disable_mtrr_trim_setup);
>+
>+/*
>+ * Newer AMD K8s and later CPUs have a special magic MSR way to force WB
>+ * for memory >4GB. Check for that here.
>+ * Note this won't check if the MTRRs < 4GB where the magic bit doesn't
>+ * apply to are wrong, but so far we don't know of any such case in the wild.
>+ */
>+#define Tom2Enabled (1U << 21)
>+#define Tom2ForceMemTypeWB (1U << 22)
>+
>+static __init int amd_special_default_mtrr(unsigned long end_pfn)
>+{
>+	u32 l, h;
>+
>+	/* Doesn't apply to memory < 4GB */
>+	if (end_pfn <= (0xffffffff >> PAGE_SHIFT))
>+		return 0;
>+	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
>+		return 0;
>+	if (boot_cpu_data.x86 < 0xf || boot_cpu_data.x86 > 0x11)
>+		return 0;
>+	/* In case some hypervisor doesn't pass SYSCFG through */
>+	if (rdmsr_safe(MSR_K8_SYSCFG, &l, &h) < 0)
>+		return 0;
>+	/*
>+	 * Memory between 4GB and top of mem is forced WB by this magic bit.
>+	 * Reserved before K8RevF, but should be zero there.
>+	 */
>+	if ((l & (Tom2Enabled | Tom2ForceMemTypeWB)) ==
>+		 (Tom2Enabled | Tom2ForceMemTypeWB))
>+		return 1;
>+	return 0;
>+}
>+
>+/**
>+ * mtrr_trim_uncached_memory - trim RAM not covered by MTRRs
>+ *
>+ * Some buggy BIOSes don't setup the MTRRs properly for systems with certain
>+ * memory configurations.  This routine checks that the highest MTRR matches
>+ * the end of memory, to make sure the MTRRs having a write back type cover
>+ * all of the memory the kernel is intending to use. If not, it'll trim any
>+ * memory off the end by adjusting end_pfn, removing it from the kernel's
>+ * allocation pools, warning the user with an obnoxious message.
>+ */
>+int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
>+{
>+	unsigned long i, base, size, highest_addr = 0, def, dummy;
>+	mtrr_type type;
>+	u64 trim_start, trim_size;
>+
>+	/*
>+	 * Make sure we only trim uncachable memory on machines that
>+	 * support the Intel MTRR architecture:
>+	 */
>+	rdmsr(MTRRdefType_MSR, def, dummy);
>+	def &= 0xff;
>+	if (!is_cpu(INTEL) || disable_mtrr_trim || def != MTRR_TYPE_UNCACHABLE)
>+		return 0;
>+
>+	/* Find highest cached pfn */
>+	for (i = 0; i < num_var_ranges; i++) {
>+		mtrr_if->get(i, &base, &size, &type);
>+		if (type != MTRR_TYPE_WRBACK)
>+			continue;
>+		base <<= PAGE_SHIFT;
>+		size <<= PAGE_SHIFT;
>+		if (highest_addr < base + size)
>+			highest_addr = base + size;
>+	}
>+
>+	if (amd_special_default_mtrr(end_pfn))
>+		return 0;
>+
>+	if ((highest_addr >> PAGE_SHIFT) < end_pfn) {
>+		printk(KERN_WARNING "***************\n");
>+		printk(KERN_WARNING "**** WARNING: likely BIOS bug\n");
>+		printk(KERN_WARNING "**** MTRRs don't cover all of "
>+		       "memory, trimmed %ld pages\n", end_pfn -
>+		       (highest_addr >> PAGE_SHIFT));
>+		printk(KERN_WARNING "***************\n");
>+
>+		printk(KERN_INFO "update e820 for mtrr\n");
>+		trim_start = highest_addr;
>+		trim_size = end_pfn;
>+		trim_size <<= PAGE_SHIFT;
>+		trim_size -= trim_start;
>+		add_memory_region(trim_start, trim_size, E820_RESERVED);
>+		update_e820();
>+		return 1;
>+	}
>+
>+	return 0;
>+}
>+#endif
> 
> /**
>  * mtrr_bp_init - initialize mtrrs on the boot CPU
>diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.h b/arch/x86/kernel/cpu/mtrr/mtrr.h
>index 54347e9..fb74a2c 100644
>--- a/arch/x86/kernel/cpu/mtrr/mtrr.h
>+++ b/arch/x86/kernel/cpu/mtrr/mtrr.h
>@@ -12,6 +12,7 @@
> #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
> 
> #define NUM_FIXED_RANGES 88
>+#define MAX_VAR_RANGES 256
> #define MTRRfix64K_00000_MSR 0x250
> #define MTRRfix16K_80000_MSR 0x258
> #define MTRRfix16K_A0000_MSR 0x259
>@@ -32,6 +33,8 @@
>    an 8 bit field: */
> typedef u8 mtrr_type;
> 
>+extern unsigned int mtrr_usage_table[MAX_VAR_RANGES];
>+
> struct mtrr_ops {
> 	u32	vendor;
> 	u32	use_intel_if;
>diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
>index 6cbd156..1294831 100644
>--- a/arch/x86/kernel/setup_64.c
>+++ b/arch/x86/kernel/setup_64.c
>@@ -310,6 +310,13 @@ void __init setup_arch(char **cmdline_p)
> 	 * we are rounding upwards:
> 	 */
> 	end_pfn = e820_end_of_ram();
>+	/* update e820 for memory not covered by WB MTRRs */
>+	mtrr_bp_init();
>+	if (mtrr_trim_uncached_memory(end_pfn)) {
>+		e820_register_active_regions(0, 0, -1UL);
>+		end_pfn = e820_end_of_ram();
>+	}
>+
> 	num_physpages = end_pfn;
> 
> 	check_efer();
>diff --git a/include/asm-x86/mtrr.h b/include/asm-x86/mtrr.h
>index 262670e..319d065 100644
>--- a/include/asm-x86/mtrr.h
>+++ b/include/asm-x86/mtrr.h
>@@ -97,6 +97,7 @@ extern int mtrr_del_page (int reg, unsigned long base, unsigned long size);
> extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
> extern void mtrr_ap_init(void);
> extern void mtrr_bp_init(void);
>+extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
> #  else
> #define mtrr_save_fixed_ranges(arg) do {} while (0)
> #define mtrr_save_state() do {} while (0)
>@@ -120,7 +121,10 @@ static __inline__ int mtrr_del_page (int reg, unsigned long base,
> {
>     return -ENODEV;
> }
>-
>+static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
>+{
>+	return 0;
>+}
> static __inline__ void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi) {;}
> 
> #define mtrr_ap_init() do {} while (0)
>commit 093af8d7f0ba3c6be1485973508584ef081e9f93
>Author: Yinghai Lu <Yinghai.Lu@Sun.COM>
>Date:   Wed Jan 30 13:33:32 2008 +0100
>
>    x86_32: trim memory by updating e820
>    
>    when MTRRs are not covering the whole e820 table, we need to trim the
>    RAM and need to update e820.
>    
>    reuse some code on 64-bit as well.
>    
>    here need to add early_get_cap and use it in early_cpu_detect, and move
>    mtrr_bp_init early.
>    
>    The code successfully trimmed the memory map on Justin's system:
>    
>    from:
>    
>     [    0.000000]  BIOS-e820: 0000000100000000 - 000000022c000000 (usable)
>    
>    to:
>    
>     [    0.000000]   modified: 0000000100000000 - 0000000228000000 (usable)
>     [    0.000000]   modified: 0000000228000000 - 000000022c000000 (reserved)
>    
>    According to Justin it makes quite a difference:
>    
>    |  When I boot the box without any trimming it acts like a 286 or 386,
>    |  takes about 10 minutes to boot (using raptor disks).
>    
>    Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
>    Tested-by: Justin Piszcz <jpiszcz@lucidpixels.com>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
>index 50d564d..fe3031d 100644
>--- a/Documentation/kernel-parameters.txt
>+++ b/Documentation/kernel-parameters.txt
>@@ -583,7 +583,7 @@ and is between 256 and 4096 characters. It is defined in the file
> 			See drivers/char/README.epca and
> 			Documentation/digiepca.txt.
> 
>-	disable_mtrr_trim [X86-64, Intel only]
>+	disable_mtrr_trim [X86, Intel and AMD only]
> 			By default the kernel will trim any uncacheable
> 			memory out of your available memory pool based on
> 			MTRR settings.  This parameter disables that behavior,
>diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
>index 56cc341..bba850b 100644
>--- a/arch/x86/kernel/cpu/common.c
>+++ b/arch/x86/kernel/cpu/common.c
>@@ -278,6 +278,33 @@ void __init cpu_detect(struct cpuinfo_x86 *c)
> 			c->x86_cache_alignment = ((misc >> 8) & 0xff) * 8;
> 	}
> }
>+static void __cpuinit early_get_cap(struct cpuinfo_x86 *c)
>+{
>+	u32 tfms, xlvl;
>+	int ebx;
>+
>+	memset(&c->x86_capability, 0, sizeof c->x86_capability);
>+	if (have_cpuid_p()) {
>+		/* Intel-defined flags: level 0x00000001 */
>+		if (c->cpuid_level >= 0x00000001) {
>+			u32 capability, excap;
>+			cpuid(0x00000001, &tfms, &ebx, &excap, &capability);
>+			c->x86_capability[0] = capability;
>+			c->x86_capability[4] = excap;
>+		}
>+
>+		/* AMD-defined flags: level 0x80000001 */
>+		xlvl = cpuid_eax(0x80000000);
>+		if ((xlvl & 0xffff0000) == 0x80000000) {
>+			if (xlvl >= 0x80000001) {
>+				c->x86_capability[1] = cpuid_edx(0x80000001);
>+				c->x86_capability[6] = cpuid_ecx(0x80000001);
>+			}
>+		}
>+
>+	}
>+
>+}
> 
> /* Do minimum CPU detection early.
>    Fields really needed: vendor, cpuid_level, family, model, mask, cache alignment.
>@@ -306,6 +333,8 @@ static void __init early_cpu_detect(void)
> 		early_init_intel(c);
> 		break;
> 	}
>+
>+	early_get_cap(c);
> }
> 
> static void __cpuinit generic_identify(struct cpuinfo_x86 * c)
>@@ -485,7 +514,6 @@ void __init identify_boot_cpu(void)
> 	identify_cpu(&boot_cpu_data);
> 	sysenter_setup();
> 	enable_sep_cpu();
>-	mtrr_bp_init();
> }
> 
> void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index ccd36ed..ac4b633 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -624,7 +624,6 @@ static struct sysdev_driver mtrr_sysdev_driver = {
> 	.resume		= mtrr_restore,
> };
> 
>-#ifdef CONFIG_X86_64
> static int disable_mtrr_trim;
> 
> static int __init disable_mtrr_trim_setup(char *str)
>@@ -643,13 +642,10 @@ early_param("disable_mtrr_trim", disable_mtrr_trim_setup);
> #define Tom2Enabled (1U << 21)
> #define Tom2ForceMemTypeWB (1U << 22)
> 
>-static __init int amd_special_default_mtrr(unsigned long end_pfn)
>+static __init int amd_special_default_mtrr(void)
> {
> 	u32 l, h;
> 
>-	/* Doesn't apply to memory < 4GB */
>-	if (end_pfn <= (0xffffffff >> PAGE_SHIFT))
>-		return 0;
> 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
> 		return 0;
> 	if (boot_cpu_data.x86 < 0xf || boot_cpu_data.x86 > 0x11)
>@@ -687,9 +683,14 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
> 	 * Make sure we only trim uncachable memory on machines that
> 	 * support the Intel MTRR architecture:
> 	 */
>+	if (!is_cpu(INTEL) || disable_mtrr_trim)
>+		return 0;
> 	rdmsr(MTRRdefType_MSR, def, dummy);
> 	def &= 0xff;
>-	if (!is_cpu(INTEL) || disable_mtrr_trim || def != MTRR_TYPE_UNCACHABLE)
>+	if (def != MTRR_TYPE_UNCACHABLE)
>+		return 0;
>+
>+	if (amd_special_default_mtrr())
> 		return 0;
> 
> 	/* Find highest cached pfn */
>@@ -703,8 +704,14 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
> 			highest_addr = base + size;
> 	}
> 
>-	if (amd_special_default_mtrr(end_pfn))
>+	/* kvm/qemu doesn't have mtrr set right, don't trim them all */
>+	if (!highest_addr) {
>+		printk(KERN_WARNING "***************\n");
>+		printk(KERN_WARNING "**** WARNING: likely strange cpu\n");
>+		printk(KERN_WARNING "**** MTRRs all blank, cpu in qemu?\n");
>+		printk(KERN_WARNING "***************\n");
> 		return 0;
>+	}
> 
> 	if ((highest_addr >> PAGE_SHIFT) < end_pfn) {
> 		printk(KERN_WARNING "***************\n");
>@@ -726,7 +733,6 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
> 
> 	return 0;
> }
>-#endif
> 
> /**
>  * mtrr_bp_init - initialize mtrrs on the boot CPU
>diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
>index 931934a..4e16ef4 100644
>--- a/arch/x86/kernel/e820_32.c
>+++ b/arch/x86/kernel/e820_32.c
>@@ -749,3 +749,14 @@ static int __init parse_memmap(char *arg)
> 	return 0;
> }
> early_param("memmap", parse_memmap);
>+void __init update_e820(void)
>+{
>+	u8 nr_map;
>+
>+	nr_map = e820.nr_map;
>+	if (sanitize_e820_map(e820.map, &nr_map))
>+		return;
>+	e820.nr_map = nr_map;
>+	printk(KERN_INFO "modified physical RAM map:\n");
>+	print_memory_map("modified");
>+}
>diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
>index 26a56f7..83ba3ca 100644
>--- a/arch/x86/kernel/setup_32.c
>+++ b/arch/x86/kernel/setup_32.c
>@@ -48,6 +48,7 @@
> 
> #include <video/edid.h>
> 
>+#include <asm/mtrr.h>
> #include <asm/apic.h>
> #include <asm/e820.h>
> #include <asm/mpspec.h>
>@@ -758,6 +759,11 @@ void __init setup_arch(char **cmdline_p)
> 
> 	max_low_pfn = setup_memory();
> 
>+	/* update e820 for memory not covered by WB MTRRs */
>+	mtrr_bp_init();
>+	if (mtrr_trim_uncached_memory(max_pfn))
>+		max_low_pfn = setup_memory();
>+
> #ifdef CONFIG_VMI
> 	/*
> 	 * Must be after max_low_pfn is determined, and before kernel
>diff --git a/include/asm-x86/e820_32.h b/include/asm-x86/e820_32.h
>index e2faf5f..f1da7eb 100644
>--- a/include/asm-x86/e820_32.h
>+++ b/include/asm-x86/e820_32.h
>@@ -19,12 +19,15 @@
> #ifndef __ASSEMBLY__
> 
> extern struct e820map e820;
>+extern void update_e820(void);
> 
> extern int e820_all_mapped(unsigned long start, unsigned long end,
> 			   unsigned type);
> extern int e820_any_mapped(u64 start, u64 end, unsigned type);
> extern void find_max_pfn(void);
> extern void register_bootmem_low_pages(unsigned long max_low_pfn);
>+extern void add_memory_region(unsigned long long start,
>+			      unsigned long long size, int type);
> extern void e820_register_memory(void);
> extern void limit_regions(unsigned long long size);
> extern void print_memory_map(char *who);
>commit cd7d72bb27a8c7502a602bdc299f1bb0a9357975
>Author: Ingo Molnar <mingo@elte.hu>
>Date:   Wed Jan 30 13:33:35 2008 +0100
>
>    x86: improve MTRR trimming messages
>    
>    improve the MTTR trimming messages and also trigger a WARN_ON()
>    so that kerneloops.org can pick it up and categorize it.
>    
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index ac4b633..7159195 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -706,20 +706,17 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
> 
> 	/* kvm/qemu doesn't have mtrr set right, don't trim them all */
> 	if (!highest_addr) {
>-		printk(KERN_WARNING "***************\n");
>-		printk(KERN_WARNING "**** WARNING: likely strange cpu\n");
>-		printk(KERN_WARNING "**** MTRRs all blank, cpu in qemu?\n");
>-		printk(KERN_WARNING "***************\n");
>+		printk(KERN_WARNING "WARNING: strange, CPU MTRRs all blank?\n");
>+		WARN_ON(1);
> 		return 0;
> 	}
> 
> 	if ((highest_addr >> PAGE_SHIFT) < end_pfn) {
>-		printk(KERN_WARNING "***************\n");
>-		printk(KERN_WARNING "**** WARNING: likely BIOS bug\n");
>-		printk(KERN_WARNING "**** MTRRs don't cover all of "
>-		       "memory, trimmed %ld pages\n", end_pfn -
>-		       (highest_addr >> PAGE_SHIFT));
>-		printk(KERN_WARNING "***************\n");
>+		printk(KERN_WARNING "WARNING: BIOS bug: CPU MTRRs don't cover"
>+			" all of memory, losing %LdMB of RAM.\n",
>+			(((u64)end_pfn << PAGE_SHIFT) - highest_addr) >> 20);
>+
>+		WARN_ON(1);
> 
> 		printk(KERN_INFO "update e820 for mtrr\n");
> 		trim_start = highest_addr;
>commit 9a6b344ea967efa0bb5ca4cb5405f840652b66c4
>Author: Harvey Harrison <harvey.harrison@gmail.com>
>Date:   Mon Feb 4 16:48:01 2008 +0100
>
>    x86: remove long dead cyrix mtrr code
>    
>    cyrix_arr_init was #if 0 all the way back to at least v2.6.12.
>    
>    This was the only place where arr3_protected was set to anything
>    but zero.  Eliminate this variable.
>    
>    Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/arch/x86/kernel/cpu/mtrr/cyrix.c b/arch/x86/kernel/cpu/mtrr/cyrix.c
>index 8e139c7..ff14c32 100644
>--- a/arch/x86/kernel/cpu/mtrr/cyrix.c
>+++ b/arch/x86/kernel/cpu/mtrr/cyrix.c
>@@ -7,8 +7,6 @@
> #include <asm/processor-flags.h>
> #include "mtrr.h"
> 
>-int arr3_protected;
>-
> static void
> cyrix_get_arr(unsigned int reg, unsigned long *base,
> 	      unsigned long *size, mtrr_type * type)
>@@ -99,8 +97,6 @@ cyrix_get_free_region(unsigned long base, unsigned long size, int replace_reg)
> 	case 4:
> 		return replace_reg;
> 	case 3:
>-		if (arr3_protected)
>-			break;
> 	case 2:
> 	case 1:
> 	case 0:
>@@ -115,8 +111,6 @@ cyrix_get_free_region(unsigned long base, unsigned long size, int replace_reg)
> 	} else {
> 		for (i = 0; i < 7; i++) {
> 			cyrix_get_arr(i, &lbase, &lsize, &ltype);
>-			if ((i == 3) && arr3_protected)
>-				continue;
> 			if (lsize == 0)
> 				return i;
> 		}
>@@ -260,107 +254,6 @@ static void cyrix_set_all(void)
> 	post_set();
> }
> 
>-#if 0
>-/*
>- * On Cyrix 6x86(MX) and M II the ARR3 is special: it has connection
>- * with the SMM (System Management Mode) mode. So we need the following:
>- * Check whether SMI_LOCK (CCR3 bit 0) is set
>- *   if it is set, write a warning message: ARR3 cannot be changed!
>- *     (it cannot be changed until the next processor reset)
>- *   if it is reset, then we can change it, set all the needed bits:
>- *   - disable access to SMM memory through ARR3 range (CCR1 bit 7 reset)
>- *   - disable access to SMM memory (CCR1 bit 2 reset)
>- *   - disable SMM mode (CCR1 bit 1 reset)
>- *   - disable write protection of ARR3 (CCR6 bit 1 reset)
>- *   - (maybe) disable ARR3
>- * Just to be sure, we enable ARR usage by the processor (CCR5 bit 5 set)
>- */
>-static void __init
>-cyrix_arr_init(void)
>-{
>-	struct set_mtrr_context ctxt;
>-	unsigned char ccr[7];
>-	int ccrc[7] = { 0, 0, 0, 0, 0, 0, 0 };
>-#ifdef CONFIG_SMP
>-	int i;
>-#endif
>-
>-	/* flush cache and enable MAPEN */
>-	set_mtrr_prepare_save(&ctxt);
>-	set_mtrr_cache_disable(&ctxt);
>-
>-	/* Save all CCRs locally */
>-	ccr[0] = getCx86(CX86_CCR0);
>-	ccr[1] = getCx86(CX86_CCR1);
>-	ccr[2] = getCx86(CX86_CCR2);
>-	ccr[3] = ctxt.ccr3;
>-	ccr[4] = getCx86(CX86_CCR4);
>-	ccr[5] = getCx86(CX86_CCR5);
>-	ccr[6] = getCx86(CX86_CCR6);
>-
>-	if (ccr[3] & 1) {
>-		ccrc[3] = 1;
>-		arr3_protected = 1;
>-	} else {
>-		/* Disable SMM mode (bit 1), access to SMM memory (bit 2) and
>-		 * access to SMM memory through ARR3 (bit 7).
>-		 */
>-		if (ccr[1] & 0x80) {
>-			ccr[1] &= 0x7f;
>-			ccrc[1] |= 0x80;
>-		}
>-		if (ccr[1] & 0x04) {
>-			ccr[1] &= 0xfb;
>-			ccrc[1] |= 0x04;
>-		}
>-		if (ccr[1] & 0x02) {
>-			ccr[1] &= 0xfd;
>-			ccrc[1] |= 0x02;
>-		}
>-		arr3_protected = 0;
>-		if (ccr[6] & 0x02) {
>-			ccr[6] &= 0xfd;
>-			ccrc[6] = 1;	/* Disable write protection of ARR3 */
>-			setCx86(CX86_CCR6, ccr[6]);
>-		}
>-		/* Disable ARR3. This is safe now that we disabled SMM. */
>-		/* cyrix_set_arr_up (3, 0, 0, 0, FALSE); */
>-	}
>-	/* If we changed CCR1 in memory, change it in the processor, too. */
>-	if (ccrc[1])
>-		setCx86(CX86_CCR1, ccr[1]);
>-
>-	/* Enable ARR usage by the processor */
>-	if (!(ccr[5] & 0x20)) {
>-		ccr[5] |= 0x20;
>-		ccrc[5] = 1;
>-		setCx86(CX86_CCR5, ccr[5]);
>-	}
>-#ifdef CONFIG_SMP
>-	for (i = 0; i < 7; i++)
>-		ccr_state[i] = ccr[i];
>-	for (i = 0; i < 8; i++)
>-		cyrix_get_arr(i,
>-			      &arr_state[i].base, &arr_state[i].size,
>-			      &arr_state[i].type);
>-#endif
>-
>-	set_mtrr_done(&ctxt);	/* flush cache and disable MAPEN */
>-
>-	if (ccrc[5])
>-		printk(KERN_INFO "mtrr: ARR usage was not enabled, enabled manually\n");
>-	if (ccrc[3])
>-		printk(KERN_INFO "mtrr: ARR3 cannot be changed\n");
>-/*
>-    if ( ccrc[1] & 0x80) printk ("mtrr: SMM memory access through ARR3 disabled\n");
>-    if ( ccrc[1] & 0x04) printk ("mtrr: SMM memory access disabled\n");
>-    if ( ccrc[1] & 0x02) printk ("mtrr: SMM mode disabled\n");
>-*/
>-	if (ccrc[6])
>-		printk(KERN_INFO "mtrr: ARR3 was write protected, unprotected\n");
>-}
>-#endif
>-
> static struct mtrr_ops cyrix_mtrr_ops = {
> 	.vendor            = X86_VENDOR_CYRIX,
> //	.init              = cyrix_arr_init,
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index 7159195..822d8f9 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -59,12 +59,6 @@ struct mtrr_ops * mtrr_if = NULL;
> static void set_mtrr(unsigned int reg, unsigned long base,
> 		     unsigned long size, mtrr_type type);
> 
>-#ifndef CONFIG_X86_64
>-extern int arr3_protected;
>-#else
>-#define arr3_protected 0
>-#endif
>-
> void set_mtrr_ops(struct mtrr_ops * ops)
> {
> 	if (ops->vendor && ops->vendor < X86_VENDOR_NUM)
>@@ -513,12 +507,6 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
> 		printk(KERN_WARNING "mtrr: register: %d too big\n", reg);
> 		goto out;
> 	}
>-	if (is_cpu(CYRIX) && !use_intel()) {
>-		if ((reg == 3) && arr3_protected) {
>-			printk(KERN_WARNING "mtrr: ARR3 cannot be changed\n");
>-			goto out;
>-		}
>-	}
> 	mtrr_if->get(reg, &lbase, &lsize, &ltype);
> 	if (lsize < 1) {
> 		printk(KERN_WARNING "mtrr: MTRR %d not used\n", reg);
>commit 16c02ed74361433a4fc5d8bd5f67abbac6e1c5ca
>Author: Harvey Harrison <harvey.harrison@gmail.com>
>Date:   Mon Feb 4 16:48:05 2008 +0100
>
>    x86: add cpu mtrr init function definitions to mtrr.h
>    
>    mtrr.h was included everywhere needed.  Fixes the following sparse
>    warnings.  Also, the return types in the extern definitions were
>    incorrect.
>    
>    arch/x86/kernel/cpu/mtrr/amd.c:113:12: warning: symbol 'amd_init_mtrr' was not declared. Should it be static?
>    arch/x86/kernel/cpu/mtrr/cyrix.c:268:12: warning: symbol 'cyrix_init_mtrr' was not declared. Should it be static?
>    arch/x86/kernel/cpu/mtrr/centaur.c:218:12: warning: symbol 'centaur_init_mtrr' was not declared. Should it be static?
>    
>    Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index 822d8f9..1e27b69 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -554,10 +554,6 @@ EXPORT_SYMBOL(mtrr_del);
>  * These should be called implicitly, but we can't yet until all the initcall
>  * stuff is done...
>  */
>-extern void amd_init_mtrr(void);
>-extern void cyrix_init_mtrr(void);
>-extern void centaur_init_mtrr(void);
>-
> static void __init init_ifs(void)
> {
> #ifndef CONFIG_X86_64
>diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.h b/arch/x86/kernel/cpu/mtrr/mtrr.h
>index fb74a2c..2cc77eb 100644
>--- a/arch/x86/kernel/cpu/mtrr/mtrr.h
>+++ b/arch/x86/kernel/cpu/mtrr/mtrr.h
>@@ -97,3 +97,7 @@ void mtrr_state_warn(void);
> const char *mtrr_attrib_to_str(int x);
> void mtrr_wrmsr(unsigned, unsigned, unsigned);
> 
>+/* CPU specific mtrr init functions */
>+int amd_init_mtrr(void);
>+int cyrix_init_mtrr(void);
>+int centaur_init_mtrr(void);
>commit 20651af9ac60fd6e31360688ad44861a7d05256a
>Author: Yinghai Lu <yinghai.lu@sun.com>
>Date:   Wed Feb 6 22:39:45 2008 +0100
>
>    x86: fix mttr trimming
>    
>    Pavel Emelyanov reported that his networking card did not work
>    and bisected it down to:
>    
>    "
>    The commit
>    
>      093af8d7f0ba3c6be1485973508584ef081e9f93
>      x86_32: trim memory by updating e820
>    
>    broke my e1000 card: on loading driver says that
>    
>      e1000: probe of 0000:04:03.0 failed with error -5
>    
>    and the interface doesn't appear.
>    "
>    
>    on a 32-bit kernel, base will overflow when try to do PAGE_SHIFT,
>    and highest_addr will always less 4G.
>    
>    So use pfn instead of address to avoid the overflow when more than
>    4g RAM is installed on a 32-bit kernel.
>    
>    Many thanks to Pavel Emelyanov for reporting and testing it.
>    
>    Bisected-by: Pavel Emelyanov <xemul@openvz.org>
>    Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
>    Tested-by: Pavel Emelyanov <xemul@openvz.org>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index 1e27b69..b6e136f 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -659,7 +659,7 @@ static __init int amd_special_default_mtrr(void)
>  */
> int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
> {
>-	unsigned long i, base, size, highest_addr = 0, def, dummy;
>+	unsigned long i, base, size, highest_pfn = 0, def, dummy;
> 	mtrr_type type;
> 	u64 trim_start, trim_size;
> 
>@@ -682,28 +682,27 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
> 		mtrr_if->get(i, &base, &size, &type);
> 		if (type != MTRR_TYPE_WRBACK)
> 			continue;
>-		base <<= PAGE_SHIFT;
>-		size <<= PAGE_SHIFT;
>-		if (highest_addr < base + size)
>-			highest_addr = base + size;
>+		if (highest_pfn < base + size)
>+			highest_pfn = base + size;
> 	}
> 
> 	/* kvm/qemu doesn't have mtrr set right, don't trim them all */
>-	if (!highest_addr) {
>+	if (!highest_pfn) {
> 		printk(KERN_WARNING "WARNING: strange, CPU MTRRs all blank?\n");
> 		WARN_ON(1);
> 		return 0;
> 	}
> 
>-	if ((highest_addr >> PAGE_SHIFT) < end_pfn) {
>+	if (highest_pfn < end_pfn) {
> 		printk(KERN_WARNING "WARNING: BIOS bug: CPU MTRRs don't cover"
>-			" all of memory, losing %LdMB of RAM.\n",
>-			(((u64)end_pfn << PAGE_SHIFT) - highest_addr) >> 20);
>+			" all of memory, losing %luMB of RAM.\n",
>+			(end_pfn - highest_pfn) >> (20 - PAGE_SHIFT));
> 
> 		WARN_ON(1);
> 
> 		printk(KERN_INFO "update e820 for mtrr\n");
>-		trim_start = highest_addr;
>+		trim_start = highest_pfn;
>+		trim_start <<= PAGE_SHIFT;
> 		trim_size = end_pfn;
> 		trim_size <<= PAGE_SHIFT;
> 		trim_size -= trim_start;
>commit f5106d91f2bf9153d6420f9ebb8114f73f9ce66a
>Author: Randy Dunlap <randy.dunlap@oracle.com>
>Date:   Mon Feb 18 13:10:44 2008 -0800
>
>    x86/mtrr: fix kernel-doc missing notation
>    
>    Fix mtrr kernel-doc warning:
>    Warning(linux-2.6.24-git12//arch/x86/kernel/cpu/mtrr/main.c:677): No description found for parameter 'end_pfn'
>    
>    Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index b6e136f..c8fda3e 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -649,6 +649,7 @@ static __init int amd_special_default_mtrr(void)
> 
> /**
>  * mtrr_trim_uncached_memory - trim RAM not covered by MTRRs
>+ * @end_pfn: ending page frame number
>  *
>  * Some buggy BIOSes don't setup the MTRRs properly for systems with certain
>  * memory configurations.  This routine checks that the highest MTRR matches
>
>commit aaf230424204864e2833dcc1da23e2cb0b9f39cd
>Author: Yinghai Lu <Yinghai.Lu@Sun.COM>
>Date:   Wed Jan 30 13:33:09 2008 +0100
>
>    x86: disable the GART early, 64-bit
>    
>    For K8 system: 4G RAM with memory hole remapping enabled, or more than
>    4G RAM installed.
>    
>    when try to use kexec second kernel, and the first doesn't include
>    gart_shutdown. the second kernel could have different aper position than
>    the first kernel. and second kernel could use that hole as RAM that is
>    still used by GART set by the first kernel. esp. when try to kexec
>    2.6.24 with sparse mem enable from previous kernel (from RHEL 5 or SLES
>    10). the new kernel will use aper by GART (set by first kernel) for
>    vmemmap. and after new kernel setting one new GART. the position will be
>    real RAM. the _mapcount set is lost.
>    
>    Bad page state in process 'swapper'
>    page:ffffe2000e600020 flags:0x0000000000000000 mapping:0000000000000000 mapcount:1 count:0
>    Trying to fix it up, but a reboot is needed
>    Backtrace:
>    Pid: 0, comm: swapper Not tainted 2.6.24-rc7-smp-gcdf71a10-dirty #13
>    
>    Call Trace:
>     [<ffffffff8026401f>] bad_page+0x63/0x8d
>     [<ffffffff80264169>] __free_pages_ok+0x7c/0x2a5
>     [<ffffffff80ba75d1>] free_all_bootmem_core+0xd0/0x198
>     [<ffffffff80ba3a42>] numa_free_all_bootmem+0x3b/0x76
>     [<ffffffff80ba3461>] mem_init+0x3b/0x152
>     [<ffffffff80b959d3>] start_kernel+0x236/0x2c2
>     [<ffffffff80b9511a>] _sinittext+0x11a/0x121
>    
>    and
>     [ffffe2000e600000-ffffe2000e7fffff] PMD ->ffff81001c200000 on node 0
>    phys addr is : 0x1c200000
>    
>    RHEL 5.1 kernel -53 said:
>    PCI-DMA: aperture base @ 1c000000 size 65536 KB
>    
>    new kernel said:
>    Mapping aperture over 65536 KB of RAM @ 3c000000
>    
>    So could try to disable that GART if possible.
>    
>    According to Ingo
>    
>    > hm, i'm wondering, instead of modifying the GART, why dont we simply
>    > _detect_ whatever GART settings we have inherited, and propagate that
>    > into our e820 maps? I.e. if there's inconsistency, then punch that out
>    > from the memory maps and just dont use that memory.
>    >
>    > that way it would not matter whether the GART settings came from a [old
>    > or crashing] Linux kernel that has not called gart_iommu_shutdown(), or
>    > whether it's a BIOS that has set up an aperture hole inconsistent with
>    > the memory map it passed. (or the memory map we _think_ i tried to pass
>    > us)
>    >
>    > it would also be more robust to only read and do a memory map quirk
>    > based on that, than actively trying to change the GART so early in the
>    > bootup. Later on we have to re-enable the GART _anyway_ and have to
>    > punch a hole for it.
>    >
>    > and as a bonus, we would have shored up our defenses against crappy
>    > BIOSes as well.
>    
>    add e820 modification for gart inconsistent setting.
>    
>    gart_fix_e820=off could be used to disable e820 fix.
>    
>    Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
>index 40db7dd..860a908 100644
>--- a/Documentation/kernel-parameters.txt
>+++ b/Documentation/kernel-parameters.txt
>@@ -660,6 +660,10 @@ and is between 256 and 4096 characters. It is defined in the file
> 
> 	gamma=		[HW,DRM]
> 
>+	gart_fix_e820=  [X86_64] disable the fix e820 for K8 GART
>+			Format: off | on
>+			default: on
>+
> 	gdth=		[HW,SCSI]
> 			See header of drivers/scsi/gdth.c.
> 
>diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
>index 52d2bea..bf1b469 100644
>--- a/arch/x86/kernel/aperture_64.c
>+++ b/arch/x86/kernel/aperture_64.c
>@@ -218,6 +218,95 @@ static __u32 __init search_agp_bridge(u32 *order, int *valid_agp)
> 	return 0;
> }
> 
>+static int gart_fix_e820 __initdata = 1;
>+
>+static int __init parse_gart_mem(char *p)
>+{
>+	if (!p)
>+		return -EINVAL;
>+
>+	if (!strncmp(p, "off", 3))
>+		gart_fix_e820 = 0;
>+	else if (!strncmp(p, "on", 2))
>+		gart_fix_e820 = 1;
>+
>+	return 0;
>+}
>+early_param("gart_fix_e820", parse_gart_mem);
>+
>+void __init early_gart_iommu_check(void)
>+{
>+	/*
>+	 * in case it is enabled before, esp for kexec/kdump,
>+	 * previous kernel already enable that. memset called
>+	 * by allocate_aperture/__alloc_bootmem_nopanic cause restart.
>+	 * or second kernel have different position for GART hole. and new
>+	 * kernel could use hole as RAM that is still used by GART set by
>+	 * first kernel
>+	 * or BIOS forget to put that in reserved.
>+	 * try to update e820 to make that region as reserved.
>+	 */
>+	int fix, num;
>+	u32 ctl;
>+	u32 aper_size = 0, aper_order = 0, last_aper_order = 0;
>+	u64 aper_base = 0, last_aper_base = 0;
>+	int aper_enabled = 0, last_aper_enabled = 0;
>+
>+	if (!early_pci_allowed())
>+		return;
>+
>+	fix = 0;
>+	for (num = 24; num < 32; num++) {
>+		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
>+			continue;
>+
>+		ctl = read_pci_config(0, num, 3, 0x90);
>+		aper_enabled = ctl & 1;
>+		aper_order = (ctl >> 1) & 7;
>+		aper_size = (32 * 1024 * 1024) << aper_order;
>+		aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
>+		aper_base <<= 25;
>+
>+		if ((last_aper_order && aper_order != last_aper_order) ||
>+		    (last_aper_base && aper_base != last_aper_base) ||
>+		    (last_aper_enabled && aper_enabled != last_aper_enabled)) {
>+			fix = 1;
>+			break;
>+		}
>+		last_aper_order = aper_order;
>+		last_aper_base = aper_base;
>+		last_aper_enabled = aper_enabled;
>+	}
>+
>+	if (!fix && !aper_enabled)
>+		return;
>+
>+	if (!aper_base || !aper_size || aper_base + aper_size > 0x100000000UL)
>+		fix = 1;
>+
>+	if (gart_fix_e820 && !fix && aper_enabled) {
>+		if (e820_any_mapped(aper_base, aper_base + aper_size,
>+				    E820_RAM)) {
>+			/* reserved it, so we can resuse it in second kernel */
>+			printk(KERN_INFO "update e820 for GART\n");
>+			add_memory_region(aper_base, aper_size, E820_RESERVED);
>+			update_e820();
>+		}
>+		return;
>+	}
>+
>+	/* different nodes have different setting, disable them all at first*/
>+	for (num = 24; num < 32; num++) {
>+		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
>+			continue;
>+
>+		ctl = read_pci_config(0, num, 3, 0x90);
>+		ctl &= ~1;
>+		write_pci_config(0, num, 3, 0x90, ctl);
>+	}
>+
>+}
>+
> void __init gart_iommu_hole_init(void)
> {
> 	u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
>diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
>index abc473b..07cfaae 100644
>--- a/arch/x86/kernel/e820_64.c
>+++ b/arch/x86/kernel/e820_64.c
>@@ -728,6 +728,18 @@ void __init finish_e820_parsing(void)
> 	}
> }
> 
>+void __init update_e820(void)
>+{
>+	u8 nr_map;
>+
>+	nr_map = e820.nr_map;
>+	if (sanitize_e820_map(e820.map, &nr_map))
>+		return;
>+	e820.nr_map = nr_map;
>+	printk(KERN_INFO "modified physical RAM map:\n");
>+	e820_print_map("modified");
>+}
>+
> unsigned long pci_mem_start = 0xaeedbabe;
> EXPORT_SYMBOL(pci_mem_start);
> 
>diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
>index 07547fe..12bad27 100644
>--- a/arch/x86/kernel/setup_64.c
>+++ b/arch/x86/kernel/setup_64.c
>@@ -53,6 +53,7 @@
> #include <video/edid.h>
> #include <asm/e820.h>
> #include <asm/dma.h>
>+#include <asm/gart.h>
> #include <asm/mpspec.h>
> #include <asm/mmu_context.h>
> #include <asm/proto.h>
>@@ -335,6 +336,8 @@ void __init setup_arch(char **cmdline_p)
> 
> 	finish_e820_parsing();
> 
>+	early_gart_iommu_check();
>+
> 	e820_register_active_regions(0, 0, -1UL);
> 	/*
> 	 * partially used pages are not usable - thus
>diff --git a/include/asm-x86/e820_64.h b/include/asm-x86/e820_64.h
>index 8cba49d..ff36f43 100644
>--- a/include/asm-x86/e820_64.h
>+++ b/include/asm-x86/e820_64.h
>@@ -39,6 +39,7 @@ extern void e820_register_active_regions(int nid,
> extern void finish_e820_parsing(void);
> 
> extern struct e820map e820;
>+extern void update_e820(void);
> 
> extern unsigned ebda_addr, ebda_size;
> extern unsigned long nodemap_addr, nodemap_size;
>diff --git a/include/asm-x86/gart.h b/include/asm-x86/gart.h
>index f704c50..90958ed 100644
>--- a/include/asm-x86/gart.h
>+++ b/include/asm-x86/gart.h
>@@ -9,6 +9,7 @@ extern int iommu_detected;
> extern void gart_iommu_init(void);
> extern void gart_iommu_shutdown(void);
> extern void __init gart_parse_options(char *);
>+extern void early_gart_iommu_check(void);
> extern void gart_iommu_hole_init(void);
> extern int fallback_aper_order;
> extern int fallback_aper_force;
>@@ -20,6 +21,10 @@ extern int fix_aperture;
> #define gart_iommu_aperture 0
> #define gart_iommu_aperture_allowed 0
> 
>+static inline void early_gart_iommu_check(void)
>+{
>+}
>+
> static inline void gart_iommu_shutdown(void)
> {
> }
>commit 5dca6a1bb014875a17289fdaae8c31e0a3641c99
>Author: Yinghai Lu <yhlu.kernel.send@gmail.com>
>Date:   Tue Mar 18 16:44:19 2008 -0700
>
>    x86: trim mtrr don't close gap for resource allocation.
>    
>    fix the bug reported here:
>    
>    	http://bugzilla.kernel.org/show_bug.cgi?id=10232
>    
>    use update_memory_range() instead of add_memory_range() directly
>    to avoid closing the gap.
>    
>    ( the new code only affects and runs on systems where the MTRR
>      workaround triggers. )
>    
>    Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
>    Signed-off-by: Ingo Molnar <mingo@elte.hu>
>    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
>diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
>index be83336..a6450b3 100644
>--- a/arch/x86/kernel/cpu/mtrr/main.c
>+++ b/arch/x86/kernel/cpu/mtrr/main.c
>@@ -711,7 +711,8 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
> 		trim_size = end_pfn;
> 		trim_size <<= PAGE_SHIFT;
> 		trim_size -= trim_start;
>-		add_memory_region(trim_start, trim_size, E820_RESERVED);
>+		update_memory_range(trim_start, trim_size, E820_RAM,
>+					E820_RESERVED);
> 		update_e820();
> 		return 1;
> 	}
>diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
>index 4e16ef4..80444c5 100644
>--- a/arch/x86/kernel/e820_32.c
>+++ b/arch/x86/kernel/e820_32.c
>@@ -749,6 +749,32 @@ static int __init parse_memmap(char *arg)
> 	return 0;
> }
> early_param("memmap", parse_memmap);
>+void __init update_memory_range(u64 start, u64 size, unsigned old_type,
>+				unsigned new_type)
>+{
>+	int i;
>+
>+	BUG_ON(old_type == new_type);
>+
>+	for (i = 0; i < e820.nr_map; i++) {
>+		struct e820entry *ei = &e820.map[i];
>+		u64 final_start, final_end;
>+		if (ei->type != old_type)
>+			continue;
>+		/* totally covered? */
>+		if (ei->addr >= start && ei->size <= size) {
>+			ei->type = new_type;
>+			continue;
>+		}
>+		/* partially covered */
>+		final_start = max(start, ei->addr);
>+		final_end = min(start + size, ei->addr + ei->size);
>+		if (final_start >= final_end)
>+			continue;
>+		add_memory_region(final_start, final_end - final_start,
>+					 new_type);
>+	}
>+}
> void __init update_e820(void)
> {
> 	u8 nr_map;
>diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
>index 9f65b4c..9be6971 100644
>--- a/arch/x86/kernel/e820_64.c
>+++ b/arch/x86/kernel/e820_64.c
>@@ -744,6 +744,33 @@ void __init finish_e820_parsing(void)
> 	}
> }
> 
>+void __init update_memory_range(u64 start, u64 size, unsigned old_type,
>+				unsigned new_type)
>+{
>+	int i;
>+
>+	BUG_ON(old_type == new_type);
>+
>+	for (i = 0; i < e820.nr_map; i++) {
>+		struct e820entry *ei = &e820.map[i];
>+		u64 final_start, final_end;
>+		if (ei->type != old_type)
>+			continue;
>+		/* totally covered? */
>+		if (ei->addr >= start && ei->size <= size) {
>+			ei->type = new_type;
>+			continue;
>+		}
>+		/* partially covered */
>+		final_start = max(start, ei->addr);
>+		final_end = min(start + size, ei->addr + ei->size);
>+		if (final_start >= final_end)
>+			continue;
>+		add_memory_region(final_start, final_end - final_start,
>+					 new_type);
>+	}
>+}
>+
> void __init update_e820(void)
> {
> 	u8 nr_map;
>diff --git a/include/asm-x86/e820_32.h b/include/asm-x86/e820_32.h
>index f1da7eb..e7207a6 100644
>--- a/include/asm-x86/e820_32.h
>+++ b/include/asm-x86/e820_32.h
>@@ -28,6 +28,8 @@ extern void find_max_pfn(void);
> extern void register_bootmem_low_pages(unsigned long max_low_pfn);
> extern void add_memory_region(unsigned long long start,
> 			      unsigned long long size, int type);
>+extern void update_memory_range(u64 start, u64 size, unsigned old_type,
>+				unsigned new_type);
> extern void e820_register_memory(void);
> extern void limit_regions(unsigned long long size);
> extern void print_memory_map(char *who);
>diff --git a/include/asm-x86/e820_64.h b/include/asm-x86/e820_64.h
>index a560c4f..22ede73 100644
>--- a/include/asm-x86/e820_64.h
>+++ b/include/asm-x86/e820_64.h
>@@ -18,6 +18,8 @@ extern unsigned long find_e820_area(unsigned long start, unsigned long end,
> 				    unsigned size, unsigned long align);
> extern void add_memory_region(unsigned long start, unsigned long size, 
> 			      int type);
>+extern void update_memory_range(u64 start, u64 size, unsigned old_type,
>+				unsigned new_type);
> extern void setup_memory_region(void);
> extern void contig_e820_setup(void); 
> extern unsigned long e820_end_of_ram(void);

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Attachments on bug 445348: 305161