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

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Date:	Tue, 29 Sep 2015 09:14:10 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Vinson Lee <vlee@...pensource.com>
Cc:	"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>,
	linux-tip-commits@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [tip:perf/core] tools: Add err.h with ERR_PTR PTR_ERR interface

On Mon, Sep 28, 2015 at 11:35:45PM -0700, Vinson Lee wrote:
> On Mon, Sep 21, 2015 at 4:41 PM, Vinson Lee <vlee@...pensource.com> wrote:
> > 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
> 
> Hi.
> 
> This build error still occurs with next-20150929.

attached patch should fix it

FYI there's another instance of this bug in parse-events.c in
Arnaldo's perf/core due to recent fixes, I'll send out fix shortly

thanks,
jirka


---
The error variable breaks build on CentOS 6.7, due to
collision with global error symbol:

    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

Using 'err' name instead to fix it.

Reported-by: Vinson Lee <vlee@...pensource.com>
Link: http://lkml.kernel.org/n/tip-i9mdgdbrgauy3fe76s9rd125@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/include/linux/err.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/include/linux/err.h b/tools/include/linux/err.h
index c9ada48f5156..1156cd20e0b7 100644
--- a/tools/include/linux/err.h
+++ b/tools/include/linux/err.h
@@ -31,9 +31,9 @@
 
 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 
-static inline void * __must_check ERR_PTR(long error)
+static inline void * __must_check ERR_PTR(long err)
 {
-	return (void *) error;
+	return (void *) err;
 }
 
 static inline long __must_check PTR_ERR(__force const void *ptr)
-- 
2.4.3

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