linux-kernel - Re: [PATCH] percpu: update comments to reflect that percpu allocations are always zero-filled

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Date:	Fri, 10 Sep 2010 11:07:25 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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: update comments to reflect that percpu
 allocations are always zero-filled

Thanks

On Fri, Sep 10, 2010 at 11:03 AM, Tejun Heo <tj@...nel.org> wrote:
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reported-by: Stephane Eranian <eranian@...gle.com>
> ---
>  mm/percpu.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/mm/percpu.c b/mm/percpu.c
> index 0cd4bf6..12dea33 100644
> --- a/mm/percpu.c
> +++ b/mm/percpu.c
> @@ -826,8 +826,8 @@ fail_unlock_mutex:
>  * @size: size of area to allocate in bytes
>  * @align: alignment of area (max PAGE_SIZE)
>  *
> - * Allocate percpu area of @size bytes aligned at @align.  Might
> - * sleep.  Might trigger writeouts.
> + * Allocate zero-filled percpu area of @size bytes aligned at @align.
> + * Might sleep.  Might trigger writeouts.
>  *
>  * CONTEXT:
>  * Does GFP_KERNEL allocation.
> @@ -846,9 +846,10 @@ EXPORT_SYMBOL_GPL(__alloc_percpu);
>  * @size: size of area to allocate in bytes
>  * @align: alignment of area (max PAGE_SIZE)
>  *
> - * Allocate percpu area of @size bytes aligned at @align from reserved
> - * percpu area if arch has set it up; otherwise, allocation is served
> - * from the same dynamic area.  Might sleep.  Might trigger writeouts.
> + * Allocate zero-filled percpu area of @size bytes aligned at @align
> + * from reserved percpu area if arch has set it up; otherwise,
> + * allocation is served from the same dynamic area.  Might sleep.
> + * Might trigger writeouts.
>  *
>  * CONTEXT:
>  * Does GFP_KERNEL allocation.
> --
> 1.7.1
>
>
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