linux-kernel - [tip:perf/urgent] perf tools: Fix permission checks

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Message-ID: <tip-c10edee2e1716f8cf217cf52ed01ae4742fcdf3c@git.kernel.org>
Date:	Sun, 8 Nov 2009 16:09:42 GMT
From:	tip-bot for Pekka Enberg <penberg@...helsinki.fi>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, penberg@...helsinki.fi,
	fweisbec@...il.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf tools: Fix permission checks

Commit-ID:  c10edee2e1716f8cf217cf52ed01ae4742fcdf3c
Gitweb:     http://git.kernel.org/tip/c10edee2e1716f8cf217cf52ed01ae4742fcdf3c
Author:     Pekka Enberg <penberg@...helsinki.fi>
AuthorDate: Sun, 8 Nov 2009 18:01:06 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 8 Nov 2009 17:04:54 +0100

perf tools: Fix permission checks

The perf_event_open() system call returns EACCES if the user is
not root which results in a very confusing error message:

  $ perf record -A -a -f

    Error: perfcounter syscall returned with -1 (Permission denied)

    Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?

It turns out that's because perf tools are checking only for
EPERM. Fix that up to get a much better error message:

  $ perf record -A -a -f
    Fatal: Permission error - are you root?

Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <1257696066-4046-1-git-send-email-penberg@...helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/builtin-record.c |    2 +-
 tools/perf/builtin-top.c    |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 3eeef33..a4be453 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -426,7 +426,7 @@ try_again:
 	if (fd[nr_cpu][counter] < 0) {
 		int err = errno;
 
-		if (err == EPERM)
+		if (err == EPERM || err == EACCES)
 			die("Permission error - are you root?\n");
 		else if (err ==  ENODEV && profile_cpu != -1)
 			die("No such device - did you specify an out-of-range profile CPU?\n");
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index a1b1d10..e23bc74 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1027,7 +1027,7 @@ try_again:
 	if (fd[i][counter] < 0) {
 		int err = errno;
 
-		if (err == EPERM)
+		if (err == EPERM || err == EACCES)
 			die("No permission - are you root?\n");
 		/*
 		 * If it's cycles then fall back to hrtimer
--
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