linux-kernel - Re: [PATCH] slab: prevent warnings when allocating with __GFP

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Message-ID: <0000013f3075f90d-735942a8-b4b8-413f-a09e-57d1de0c4974-000000@email.amazonses.com>
Date:	Mon, 10 Jun 2013 23:40:05 +0000
From:	Christoph Lameter <cl@...two.org>
To:	Sasha Levin <sasha.levin@...cle.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] slab: prevent warnings when allocating with
 __GFP_NOWARN

On Mon, 10 Jun 2013, Sasha Levin wrote:

> [ 1691.807621] Call Trace:
> [ 1691.809473]  [<ffffffff83ff4041>] dump_stack+0x4e/0x82
> [ 1691.812783]  [<ffffffff8111fe12>] warn_slowpath_common+0x82/0xb0
> [ 1691.817011]  [<ffffffff8111fe55>] warn_slowpath_null+0x15/0x20
> [ 1691.819936]  [<ffffffff81243dcf>] kmalloc_slab+0x2f/0xb0
> [ 1691.824942]  [<ffffffff81278d54>] __kmalloc+0x24/0x4b0
> [ 1691.827285]  [<ffffffff8196ffe3>] ? security_capable+0x13/0x20
> [ 1691.829405]  [<ffffffff812a26b7>] ? pipe_fcntl+0x107/0x210
> [ 1691.831827]  [<ffffffff812a26b7>] pipe_fcntl+0x107/0x210
> [ 1691.833651]  [<ffffffff812b7ea0>] ? fget_raw_light+0x130/0x3f0
> [ 1691.835343]  [<ffffffff812aa5fb>] SyS_fcntl+0x60b/0x6a0
> [ 1691.837008]  [<ffffffff8403ca98>] tracesys+0xe1/0xe6
>
> The caller specifically sets __GFP_NOWARN presumably to avoid this warning on
> slub but I'm not sure if there's any other reason.

There must be another reason. Lets fix this.

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