linux-kernel - Re: [Suggestion] kernel: 'now' may be used uninitialized in posix_cpu_timer

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Message-ID: <51519549.5070204@asianux.com>
Date:	Tue, 26 Mar 2013 20:32:09 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	tglx@...utronix.de, Greg KH <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Suggestion] kernel: 'now' may be used uninitialized in posix_cpu_timer_schedule
 function

On 2013年03月26日 20:27, Frederic Weisbecker wrote:
> 2013/3/26 Chen Gang <gang.chen@...anux.com>:
>> > Hello Maintainers:
>> >
>> >   compiling with EXTRA_CFLAGS=-W:
>> >     make V=1 EXTRA_CFLAGS=-W ARCH=arm s3c2410_defconfig
>> >     make V=1 EXTRA_CFLAGS=-W ARCH=arm menuconfig
>> >       set 'arm-linux-gnu-' for cross chain prefix
>> >     make V=1 EXTRA_CFLAGS=-W ARCH=arm
>> >
>> >   it will report:
>> >     kernel/posix-cpu-timers.c:1065:19: warning: �now� may be used uninitialized in this function [-Wuninitialized]
>> >
>> >   it seems it is really a bug.
>> >     can any member help to fix it ?
>> >     or provide additional suggestion ?
>> >       (it seems only "unsigned long long now = 0" is not enough).
> Yeah it's missing a call to cpu_timer_sample_group() before
> clear_dead_task(). Andrew Morton reported the warning and I have a
> pending patch to fix that. I'm just checking a few other things before
> sending it. These clear_dead_task() calls seem to also conflict with
> cleanup_timers(). I'm fixing that too.
> 
> Thanks for your report!
> 
> 

  thank you, too.

  :-)

-- 
Chen Gang

Asianux Corporation
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