linux-kernel - Re: [tip:perf/core] tools: Add err.h with ERR_PTR PTR

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Date:	Mon, 21 Sep 2015 16:41:55 -0700
From:	Vinson Lee <vlee@...pensource.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	raphael.beamonte@...il.com, matt@...eblueprint.co.uk,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] tools: Add err.h with ERR_PTR PTR_ERR interface

On Wed, Sep 16, 2015 at 12:28 AM, tip-bot for Jiri Olsa
<tipbot@...or.com> wrote:
> Commit-ID:  01ca9fd41d6f2ad796a6b109b5253e06b6ae6dc7
> Gitweb:     http://git.kernel.org/tip/01ca9fd41d6f2ad796a6b109b5253e06b6ae6dc7
> Author:     Jiri Olsa <jolsa@...nel.org>
> AuthorDate: Mon, 7 Sep 2015 10:38:03 +0200
> Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
> CommitDate: Tue, 15 Sep 2015 09:48:32 -0300
>
> tools: Add err.h with ERR_PTR PTR_ERR interface
>
> Adding part of the kernel's <linux/err.h> interface:
>
>   inline void * __must_check ERR_PTR(long error);
>   inline long   __must_check PTR_ERR(__force const void *ptr);
>   inline bool   __must_check IS_ERR(__force const void *ptr);
>
> It will be used to propagate error through pointers in following
> patches.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> Reviewed-by: Raphael Beamonte <raphael.beamonte@...il.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Matt Fleming <matt@...eblueprint.co.uk>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Link: http://lkml.kernel.org/r/1441615087-13886-2-git-send-email-jolsa@kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>


Hi.

This patch appears to have introduced a build error on CentOS 6.7 with GCC 4.4.

This build error occurs on next-20150921.

  CC       util/evlist.o
cc1: warnings being treated as errors
In file included from util/evlist.c:28:
tools/include/linux/err.h: In function ‘ERR_PTR’:
tools/include/linux/err.h:34: error: declaration of ‘error’ shadows a
global declaration
util/util.h:135: error: shadowed declaration is here

$ gcc --version
gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-16)
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.

Cheers,
Vinson
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