linux-kernel - [PATCH 3/3] percpu: fix percpu accessors to potentially !cpu

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Date:	Fri, 21 Nov 2008 21:11:42 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: [PATCH 3/3] percpu: fix percpu accessors to potentially !cpu_possible() cpus: x86 voyager

Impact: CPU iterator bugfixes

Percpu areas are only allocated for possible cpus.  In general, you
shouldn't access random cpu's percpu areas.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Mike Travis <travis@....com>
Acked-by: Ingo Molnar <mingo@...e.hu>
Cc: James Bottomley <James.Bottomley@...senPartnership.com>
---
 arch/x86/mach-voyager/voyager_smp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- test-compile.orig/arch/x86/mach-voyager/voyager_smp.c
+++ test-compile/arch/x86/mach-voyager/voyager_smp.c
@@ -1223,7 +1223,7 @@ int setup_profiling_timer(unsigned int m
 	 * new values until the next timer interrupt in which they do process
 	 * accounting.
 	 */
-	for (i = 0; i < NR_CPUS; ++i)
+	for_each_possible_cpu(i)
 		per_cpu(prof_multiplier, i) = multiplier;
 
 	return 0;


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