linux-kernel - Re: Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf)

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Date:	Thu, 10 Nov 2011 01:11:07 +0000
From:	Dave Haywood <tla@....selfip.net>
To:	Borislav Petkov <bp@...en8.de>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf)

On 09/11/2011 11:33, Borislav Petkov wrote:

> On Wed, Nov 09, 2011 at 08:47:58AM +0000, Dave Haywood wrote:
>> Hi,
>>
>>   Noticed this new warning in the build of kernel v3.2-rc1-90-g19e0baf:
>>
>>   CC      kernel/trace/trace.o
>> kernel/trace/trace.c: In function 'tracing_mark_write':
>> kernel/trace/trace.c:3644:8: warning: 'page2' may be used uninitialized in this function
> That has to be gcc 4.5.x something. 4.6 is smarter in that aspect:
Correct, version is:

$ gcc --version

gcc (Gentoo Hardened 4.5.3-r1 p1.0, pie-0.4.5) 4.5.3

Copyright (C) 2010 Free Software Foundation, Inc.

This is free software; see the source for copying conditions.  There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

>
> $ make CC=gcc-4.6 kernel/trace/trace.o
>   CHK     include/linux/version.h
>   UPD     include/linux/version.h
>   CHK     include/generated/utsrelease.h
>   UPD     include/generated/utsrelease.h
>   CC      kernel/bounds.s
>
>   ...
>
>   HOSTLD  scripts/mod/modpost
>   CC      kernel/trace/trace.o
> $ make CC=gcc-4.5 kernel/trace/trace.o
>   CHK     include/linux/version.h
>   CHK     include/generated/utsrelease.h
>   CC      kernel/bounds.s
>
>   ...
>
>   HOSTLD  scripts/mod/modpost
>   CC      kernel/trace/trace.o
> kernel/trace/trace.c: In function ‘tracing_mark_write’:
> kernel/trace/trace.c:3644:8: warning: ‘page2’ may be used uninitialized in this function
>
> HTH
>

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