From: Thomas Gleixner <tglx@linutronix.de>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH] debugobjects: Use GFP_ATOMIC to allocate when initializing
Date: Mon, 2 Apr 2012 11:12:00 +0200 (CEST) [thread overview]
Message-ID: <alpine.LFD.2.02.1204021111070.2542@ionos> (raw)
In-Reply-To: <CA+1xoqeTJu-uaaOCek5Y5ZKam83ePoRNFdxLcqdonYxok-BkhA@mail.gmail.com>
On Sun, 1 Apr 2012, Sasha Levin wrote:
> On Sun, Apr 1, 2012 at 7:36 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
> > On Sat, 31 Mar 2012, Sasha Levin wrote:
Peter ????
> >> During the init stage, we have only 1 cpu and run with IRQs disabled,
> >> we can't allocate with GFP_KERNEL.
> >>
> >> This also fixes the related warning on boot.
> >
> > Hrmm. This should not be the case. In early boot GFP_KERNEL
> > allocations should not trigger a warning when interrupts are
> > disabled. Which kind of warning are you observing ?
>
> There were two, both pointing at the same WARN(). I don't have the
> first one which was fixed in this patch handy, but the second one is:
>
> [ 0.000000] WARNING: at kernel/lockdep.c:2739
> lockdep_trace_alloc+0x11f/0x130()
> [ 0.000000] Pid: 0, comm: swapper/0 Not tainted
> 3.3.0-next-20120330-sasha-dirty #40
> [ 0.000000] Call Trace:
> [ 0.000000] [<ffffffff810b4175>] warn_slowpath_common+0x75/0xb0
> [ 0.000000] [<ffffffff810b41c5>] warn_slowpath_null+0x15/0x20
> [ 0.000000] [<ffffffff8111999f>] lockdep_trace_alloc+0x11f/0x130
> [ 0.000000] [<ffffffff81182e0c>] __alloc_pages_nodemask+0x9c/0x260
> [ 0.000000] [<ffffffff826bcea7>] ? retint_restore_args+0x6/0x13
> [ 0.000000] [<ffffffff811cc2cd>] kmemcheck_alloc_shadow+0x4d/0xf0
> [ 0.000000] [<ffffffff811c5597>] allocate_slab+0x197/0x270
> [ 0.000000] [<ffffffff811c569b>] new_slab+0x2b/0x190
> [ 0.000000] [<ffffffff811c7e7a>] ? __slab_alloc+0x5a/0x6b0
> [ 0.000000] [<ffffffff811c82b3>] __slab_alloc+0x493/0x6b0
> [ 0.000000] [<ffffffff81114f61>] ? trace_hardirqs_off_caller+0xe1/0x150
> [ 0.000000] [<ffffffff81886f1d>] ? trace_hardirqs_off_thunk+0x3a/0x3c
> [ 0.000000] [<ffffffff8395eb55>] ?
> debug_objects_replace_static_objects+0x2a/0x1f5
> [ 0.000000] [<ffffffff8395eb55>] ?
> debug_objects_replace_static_objects+0x2a/0x1f5
> [ 0.000000] [<ffffffff811c900e>] kmem_cache_alloc+0x17e/0x1a0
> [ 0.000000] [<ffffffff8395eb55>]
> debug_objects_replace_static_objects+0x2a/0x1f5
> [ 0.000000] [<ffffffff8395ed59>] debug_objects_mem_init+0x39/0x68
> [ 0.000000] [<ffffffff8392af65>] start_kernel+0x33a/0x3f8
> [ 0.000000] [<ffffffff8392aa13>] ? kernel_init+0x280/0x280
> [ 0.000000] [<ffffffff8392a2b6>] x86_64_start_reservations+0xa1/0xa6
> [ 0.000000] [<ffffffff8392a410>] x86_64_start_kernel+0x155/0x164
> [ 0.000000] ---[ end trace a7919e7f17c0a725 ]---
next prev parent reply other threads:[~2012-04-02 9:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-31 21:22 Sasha Levin
2012-04-01 2:17 ` Yong Zhang
2012-04-01 17:36 ` Thomas Gleixner
2012-04-01 17:53 ` Sasha Levin
2012-04-02 9:12 ` Thomas Gleixner [this message]
2012-04-02 18:35 ` Peter Zijlstra
2012-04-02 18:38 ` Pekka Enberg
2012-04-02 19:05 ` Sasha Levin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.LFD.2.02.1204021111070.2542@ionos \
--to=tglx@linutronix.de \
--cc=levinsasha928@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome