linux-kernel - [PATCH] perf top: Use a macro instead of a constant variable

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Message-Id: <1266866062-6287-1-git-send-email-acme@infradead.org>
Date:	Mon, 22 Feb 2010 16:14:22 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: [PATCH] perf top: Use a macro instead of a constant variable

From: Arnaldo Carvalho de Melo <acme@...hat.com>

To overcome a silly gcc warning:

cc1: warnings being treated as errors
builtin-top.c: In function ‘lookup_sym_source’:
builtin-top.c:291: warning: not protecting local variables: variable length buffer
make: *** [builtin-top.o] Error 1
make: *** Waiting for unfinished jobs....

That is emitted for this:

	const size_t pattern_len = BITS_PER_LONG / 4 + 2;
	char pattern[pattern_len + 1];

Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index a457bbb..1a197f4 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -291,7 +291,7 @@ static void lookup_sym_source(struct sym_entry *syme)
 {
 	struct symbol *symbol = sym_entry__symbol(syme);
 	struct source_line *line;
-	const size_t pattern_len = BITS_PER_LONG / 4 + 2;
+#define pattern_len (BITS_PER_LONG / 4 + 2)
 	char pattern[pattern_len + 1];
 
 	sprintf(pattern, "%0*Lx <", BITS_PER_LONG / 4,
@@ -305,6 +305,7 @@ static void lookup_sym_source(struct sym_entry *syme)
 		}
 	}
 	pthread_mutex_unlock(&syme->src->lock);
+#undef pattern_len
 }
 
 static void show_lines(struct source_line *queue, int count, int total)
-- 
1.5.5.1

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