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SubjectRe: [PATCH] modules fix incorrect percpu usage
* Mathieu Desnoyers (mathieu.desnoyers@efficios.com) wrote:
> Should use per_cpu_ptr() to obfuscate the per cpu pointers (RELOC_HIDE is needed
> for per cpu pointers).
>
> Introduced by commit:
>
> module.c: commit 6b588c18f8dacfa6d7957c33c5ff832096e752d3
>
> This patch should be queued for the stable branch, for kernels 2.6.29.x to
> 2.6.33.x.
> (tested on 2.6.33.1 x86_64)

It's actually needed for mainline too (2.6.34-rc2).

Thanks,

Mathieu

>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> CC: Randy Dunlap <randy.dunlap@oracle.com>
> CC: Eric Dumazet <dada1@cosmosbay.com>
> CC: Rusty Russell <rusty@rustcorp.com.au>
> CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
> CC: Tejun Heo <tj@kernel.org>
> CC: Ingo Molnar <mingo@elte.hu>
> CC: Andrew Morton <akpm@linux-foundation.org>
> CC: Linus Torvalds <torvalds@linux-foundation.org>
> CC: Greg Kroah-Hartman <gregkh@suse.de>
> CC: Steven Rostedt <rostedt@goodmis.org>
> CC: stable <stable@kernel.org>
> ---
> kernel/module.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: linux-2.6-lttng/kernel/module.c
> ===================================================================
> --- linux-2.6-lttng.orig/kernel/module.c 2010-03-29 23:47:05.000000000 -0400
> +++ linux-2.6-lttng/kernel/module.c 2010-03-29 23:47:27.000000000 -0400
> @@ -412,7 +412,7 @@ static void percpu_modcopy(void *pcpudes
> int cpu;
>
> for_each_possible_cpu(cpu)
> - memcpy(pcpudest + per_cpu_offset(cpu), from, size);
> + memcpy(per_cpu_ptr(pcpudest, cpu), from, size);
> }
>
> #else /* ... !CONFIG_SMP */
>
> --
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com


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