linux-kernel - [PATCH 2/2] perf symbols: Accept an alias when looking for "

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Date:	Fri, 15 Jan 2010 18:08:27 -0200
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 2/2] perf symbols: Accept an alias when looking for "_text"

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

As it is in PARISC64:

parisc:~# uname -a
Linux parisc 2.6.33-rc4-tip+ #1 SMP Thu Jan 14 13:33:34 BRST 2010 parisc64 GNU/Linux
parisc:~# grep -w _text /proc/kallsyms
0000000040100000 A _text
parisc:~# grep 0000000040100000 /proc/kallsyms
0000000040100000 T stext
0000000040100000 T _stext
0000000040100000 A _text
parisc:~#

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/util/event.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 966d207..dc13cad 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -227,7 +227,12 @@ static int find_symbol_cb(void *arg, const char *name, char type, u64 start)
 {
 	struct process_symbol_args *args = arg;
 
-	if (!symbol_type__is_a(type, MAP__FUNCTION) || strcmp(name, args->name))
+	/*
+	 * Must be a function or at least an alias, as in PARISC64, where "_text" is
+	 * an 'A' to the same address as "_stext".
+	 */
+	if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
+	      type == 'A') || strcmp(name, args->name))
 		return 0;
 
 	args->start = start;
-- 
1.6.2.5

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