Attachment 210261 Details for Bug 310801 – Register backing store patch

[patch] Register backing store patch

rbs.patch (text/plain), 1.26 KB, created by Andrew B on 2007-09-28 13:00:51 UTC

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Creator: Andrew B

Created: 2007-09-28 13:00:51 UTC

Size: 1.26 KB

patch

obsolete

>diff -urp linux-2.6.18/arch/ia64/mm/fault.c linux-2.6.18/arch/ia64/mm/fault.c
>--- linux-2.6.18/arch/ia64/mm/fault.c	2006-09-20 04:42:06.000000000 +0100
>+++ linux-2.6.18/arch/ia64/mm/fault.c	2007-08-07 08:18:11.000000000 +0100
>@@ -125,11 +125,17 @@ ia64_do_page_fault (unsigned long addres
> 	down_read(&mm->mmap_sem);
> 
> 	vma = find_vma_prev(mm, address, &prev_vma);
>-	if (!vma)
>+	if (!vma && !prev_vma )
> 		goto bad_area;
> 
>-	/* find_vma_prev() returns vma such that address < vma->vm_end or NULL */
>-	if (address < vma->vm_start)
>+        /*
>+         * find_vma_prev() returns vma such that address < vma->vm_end or NULL
>+         *
>+         * May find no vma, but could be that the last vm area is the
>+         * register backing store that needs to expand upwards, in
>+         * this case vma will be null, but prev_vma will ne non-null
>+         */
>+        if (( !vma && prev_vma ) || (address < vma->vm_start) )
> 		goto check_expansion;
> 
>   good_area:
>@@ -184,6 +190,8 @@ ia64_do_page_fault (unsigned long addres
> 
>   check_expansion:
> 	if (!(prev_vma && (prev_vma->vm_flags & VM_GROWSUP) && (address == prev_vma->vm_end))) {
>+		if (!vma)
>+			goto bad_area;
> 		if (!(vma->vm_flags & VM_GROWSDOWN))
> 			goto bad_area;
> 		if (REGION_NUMBER(address) != REGION_NUMBER(vma->vm_start)

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Attachments on bug 310801: 210261