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

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Message-ID: <20111109113303.GA18508@gere.osrc.amd.com>
Date:	Wed, 9 Nov 2011 12:33:03 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Haywood <tla@....selfip.net>
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 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:

$ 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

-- 
Regards/Gruss,
Boris.
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