From: Jens Axboe <axboe@kernel.dk>
To: Ingo Molnar <mingo@kernel.org>
Cc: John Stultz <john.stultz@linaro.org>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Vivek Goyal <vgoyal@redhat.com>,
Fengguang Wu <fengguang.wu@intel.com>
Subject: Re: [PATCH] block: Employ u64_stats_init()
Date: Wed, 13 Nov 2013 10:35:58 -0700 [thread overview]
Message-ID: <5283B87E.2070703@kernel.dk> (raw)
In-Reply-To: <20131113173521.GA10482@gmail.com>
On 11/13/2013 10:35 AM, Ingo Molnar wrote:
>
> * Jens Axboe <axboe@kernel.dk> wrote:
>
>> On 11/12/2013 08:42 PM, John Stultz wrote:
>>> From: Peter Zijlstra <peterz@infradead.org>
>>>
>>> Now that seqcounts are lockdep enabled objects, we need to properly
>>> initialize them.
>>>
>>> Without this patch, Fengguang was seeing:
>>> [ 4.127282] INFO: trying to register non-static key.
>>> [ 4.128027] the code is fine but needs lockdep annotation.
>>> [ 4.128027] turning off the locking correctness validator.
>>> [ 4.128027] CPU: 0 PID: 96 Comm: kworker/u4:1 Not tainted 3.12.0-next-20131108-10601-gbad570d #2
>>> [ 4.128027] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
>>> [ 4.128027] Workqueue: events_unbound async_run_entry_fn
>>> [ 4.128027] 7908e744 00000000 78019968 79dc7cf2 7a80e0a8 780199a0 7908953e 7a1b7f4d
>>> [ 4.128027] 7a1b7fa7 7a1b7f7d 7f368608 00000000 00000011 44374011 0000a805 7f368110
>>> [ 4.128027] 7f368110 85bf2a70 00000000 780199cc 7908a1c5 00000000 00000001 00000000
>>> [ 4.128027] Call Trace:
>>> [ 4.128027] [<7908e744>] ? console_unlock+0x353/0x380
>>> [ 4.128027] [<79dc7cf2>] dump_stack+0x48/0x60
>>> [ 4.128027] [<7908953e>] __lock_acquire.isra.26+0x7e3/0xceb
>>> [ 4.128027] [<7908a1c5>] lock_acquire+0x71/0x9a
>>> [ 4.128027] [<794079aa>] ? blk_throtl_bio+0x1c3/0x485
>>> [ 4.128027] [<7940658b>] throtl_update_dispatch_stats+0x7c/0x153
>>> [ 4.128027] [<794079aa>] ? blk_throtl_bio+0x1c3/0x485
>>> [ 4.128027] [<794079aa>] blk_throtl_bio+0x1c3/0x485
>>> ...
>>>
>>> Cc: Vivek Goyal <vgoyal@redhat.com>
>>> Cc: Jens Axboe <axboe@kernel.dk>
>>> Cc: Fengguang Wu <fengguang.wu@intel.com>
>>> Cc: Ingo Molnar <mingo@kernel.org>
>>> Reported-by: Fengguang Wu <fengguang.wu@intel.com>
>>> Signed-off-by: Peter Zijlstra <peterz@infradead.org>
>>> [jstultz: Folded in another fix from the mailing list as well as a fix
>>> to that fix. Tweaked commit message.]
>>> Signed-off-by: John Stultz <john.stultz@linaro.org>
>>
>> Thanks for fixing this up, John/Peter. I'll get it queued up.
>
> Note that I've already applied it to the locking tree earlier today and
> sent it to Linus, didn't want to expose upstream to known false positives.
OK, that works for me, thanks!
--
Jens Axboe
next prev parent reply other threads:[~2013-11-13 17:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-13 3:42 [PATCH] block: Employ u64_stats_init() John Stultz
2013-11-13 12:11 ` Fengguang Wu
2013-11-13 14:19 ` Vivek Goyal
2013-11-13 15:55 ` Jens Axboe
2013-11-13 17:35 ` Ingo Molnar
2013-11-13 17:35 ` Jens Axboe [this message]
2013-11-13 17:36 ` Ingo Molnar
2013-11-13 17:26 ` [tip:core/locking] block: Use u64_stats_init() to initialize seqcounts tip-bot for Peter Zijlstra
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