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authorRusty Russell <rusty@rustcorp.com.au>2009-04-21 16:03:41 +0930
committerIngo Molnar <mingo@elte.hu>2009-04-21 10:09:50 +0200
commitfcc5c4a2feea3886dc058498b28508b2731720d5 (patch)
tree10aa7e61b47ab242c25f52714640b324f69520ff /arch/x86
parent2f537a9f8e82f55c241b002c8cfbf34303b45ada (diff)
downloadlinux-fcc5c4a2feea3886dc058498b28508b2731720d5.tar.bz2
x86: avoid theoretical spurious NMI backtraces with CONFIG_CPUMASK_OFFSTACK=y
In theory (though not shown in practice) alloc_cpumask_var() doesn't zero memory, so CPUs might print an "NMI backtrace for cpu %d" once on boot. (Bug introduced in fcef8576d8a64fc603e719c97d423f9f6d4e0e8b). [ Impact: avoid theoretical syslog noise in rare configs ] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <alpine.DEB.2.00.0904202113520.10097@gandalf.stny.rr.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/apic/nmi.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/nmi.c b/arch/x86/kernel/apic/nmi.c
index 2ba52f35a88c..ce4fbfa315a1 100644
--- a/arch/x86/kernel/apic/nmi.c
+++ b/arch/x86/kernel/apic/nmi.c
@@ -138,7 +138,7 @@ int __init check_nmi_watchdog(void)
if (!prev_nmi_count)
goto error;
- alloc_cpumask_var(&backtrace_mask, GFP_KERNEL);
+ alloc_cpumask_var(&backtrace_mask, GFP_KERNEL|__GFP_ZERO);
printk(KERN_INFO "Testing NMI watchdog ... ");
#ifdef CONFIG_SMP