linux-kernel - [tip:perfcounters/core] perf_counter: tool: handle 0-length data files

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Date:	Fri, 1 May 2009 13:27:58 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
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, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: tool: handle 0-length data files

Commit-ID:  585e3374d9d29376c2c37d821c8b7637dd48ca95
Gitweb:     http://git.kernel.org/tip/585e3374d9d29376c2c37d821c8b7637dd48ca95
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 1 May 2009 12:23:18 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 1 May 2009 13:23:44 +0200

perf_counter: tool: handle 0-length data files

Avoid perf-report barfing on 0-length data files.

[ Impact: fix perf-report SIGBUS ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
LKML-Reference: <20090501102533.196245693@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 Documentation/perf_counter/perf-report.cc |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/Documentation/perf_counter/perf-report.cc b/Documentation/perf_counter/perf-report.cc
index 933a075..911d7f3 100644
--- a/Documentation/perf_counter/perf-report.cc
+++ b/Documentation/perf_counter/perf-report.cc
@@ -402,6 +402,11 @@ int main(int argc, char *argv[])
 		exit(-1);
 	}
 
+	if (!stat.st_size) {
+		fprintf(stderr, "zero-sized file, nothing to do!\n");
+		exit(0);
+	}
+
 	load_kallsyms();
 
 remap:
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