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Red Hat Bugzilla – Attachment 617625 Details for
Bug 859226
iptables and other tools unable to log to rsyslog
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[patch]
fix printk flush of messages
fix-printk-flush-of-messages.patch (text/plain), 1.95 KB, created by
Luis Claudio R. Goncalves
on 2012-09-26 16:05:00 UTC
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Description:
fix printk flush of messages
Filename:
MIME Type:
Creator:
Luis Claudio R. Goncalves
Created:
2012-09-26 16:05:00 UTC
Size:
1.95 KB
patch
obsolete
>commit 172314790a65db61c5f7d7adb91c00f67bcb2166 >Author: Frank Rowand <frank.rowand@am.sony.com> >Date: Wed May 16 18:09:36 2012 -0700 > > fix printk flush of messages > > Updates console-make-rt-friendly.patch > > #ifdef CONFIG_PREEMPT_RT_FULL, printk() output is never flushed by > printk() because: > > # some liberties taken in this pseudo-code to make it easier to follow > printk() > vprintk() > raw_spin_lock(&logbuf_lock) > # increment preempt_count(): > preempt_disable() > result = console_trylock_for_printk() > retval = 0 > # lock will always be false, because preempt_count() will be >= 1 > lock = ... && !preempt_count() > if (lock) > retval = 1 > return retval > # result will always be false since lock will always be false > if (result) > console_unlock() > # this is where the printk() output would be flushed > > On system boot some printk() output is flushed because register_console() > and tty_open() call console_unlock(). > > This change also fixes the problem that was previously fixed by > preempt-rt-allow-immediate-magic-sysrq-output-for-preempt_rt_full.patch > > Signed-off-by: Frank Rowand <frank.rowand@am.sony.com> > Cc: Frank <Frank_Rowand@sonyusa.com> > Link: http://lkml.kernel.org/r/4FB44FD0.4090800@am.sony.com > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > >diff --git a/kernel/printk.c b/kernel/printk.c >index 9eabbbb..66e83e5 100644 >--- a/kernel/printk.c >+++ b/kernel/printk.c >@@ -836,7 +836,7 @@ static int console_trylock_for_printk(unsigned int cpu, unsigned long flags) > int retval = 0, wake = 0; > #ifdef CONFIG_PREEMPT_RT_FULL > int lock = (!early_boot_irqs_disabled && !irqs_disabled_flags(flags) && >- !preempt_count()) || sysrq_in_progress; >+ (preempt_count() <= 1)) || sysrq_in_progress; > #else > int lock = 1; > #endif
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Attachments on
bug 859226
: 617625