linux-kernel - [tip:perf/core] perf evlist: Fix errno value reporting on failed mmap

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Message-ID: <tip-301b195db179241da8be25f345f3c4e64960f1d5@git.kernel.org>
Date:	Wed, 21 Dec 2011 00:43:03 -0800
From:	tip-bot for Nelson Elhage <nelhage@...hage.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	nelhage@...hage.com, namhyung@...il.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perf/core] perf evlist:
  Fix errno value reporting on failed mmap

Commit-ID:  301b195db179241da8be25f345f3c4e64960f1d5
Gitweb:     http://git.kernel.org/tip/301b195db179241da8be25f345f3c4e64960f1d5
Author:     Nelson Elhage <nelhage@...hage.com>
AuthorDate: Mon, 19 Dec 2011 08:39:30 -0500
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 20 Dec 2011 13:31:15 -0200

perf evlist: Fix errno value reporting on failed mmap

On failure, perf_evlist__mmap_per_{cpu,thread} will try to munmap()
every map that doesn't have a NULL base. This will fail with EINVAL if
one of them has base == MAP_FAILED, clobbering errno, so that
perf_evlist__map will return EINVAL on any failure regardless of the
root cause.

Fix this by resetting failed maps to a NULL base.

Acked-by: Namhyung Kim <namhyung@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1324301972-22740-2-git-send-email-nelhage@nelhage.com
Signed-off-by: Nelson Elhage <nelhage@...hage.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 8b19e7a..963d63d 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -447,8 +447,10 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
 	evlist->mmap[idx].mask = mask;
 	evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
 				      MAP_SHARED, fd, 0);
-	if (evlist->mmap[idx].base == MAP_FAILED)
+	if (evlist->mmap[idx].base == MAP_FAILED) {
+		evlist->mmap[idx].base = NULL;
 		return -1;
+	}
 
 	perf_evlist__add_pollfd(evlist, fd);
 	return 0;
--
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