linux-kernel - Re: [PATCH percpu#for-next] percpu: clear memory allocated with the km allocator

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Message-ID: <1284108918.402.31.camel@laptop>
Date:	Fri, 10 Sep 2010 10:55:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com,
	robert.richter@....com, acme@...hat.com
Subject: Re: [PATCH percpu#for-next] percpu: clear memory allocated with
 the km allocator

On Fri, 2010-09-10 at 10:52 +0200, Tejun Heo wrote:
> Percpu allocator should clear memory before returning it but the km
> allocator forgot to do it.  Fix it.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Spotted-by: Peter Zijlstra <peterz@...radead.org>

(fwiw, -tip uses Reported-by)

Acked-by: Peter Zijlstra <peterz@...radead.org>

> ---
>  mm/percpu-km.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/percpu-km.c b/mm/percpu-km.c
> index 7037bc7..89633fe 100644
> --- a/mm/percpu-km.c
> +++ b/mm/percpu-km.c
> @@ -35,7 +35,11 @@
> 
>  static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
>  {
> -	/* noop */
> +	unsigned int cpu;
> +
> +	for_each_possible_cpu(cpu)
> +		memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
> +
>  	return 0;
>  }
> 


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