linux-kernel - [tip:perf/core] perf tools: Fix bprintk reading in trace output

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Message-ID: <tip-ffa1895561645103d8f8059b35d9c06e6eeead2e@git.kernel.org>
Date:	Thu, 15 Oct 2009 08:50:09 GMT
From:	tip-bot for Steven Rostedt <srostedt@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...hat.com, peterz@...radead.org, fweisbec@...il.com,
	srostedt@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/core] perf tools: Fix bprintk reading in trace output

Commit-ID:  ffa1895561645103d8f8059b35d9c06e6eeead2e
Gitweb:     http://git.kernel.org/tip/ffa1895561645103d8f8059b35d9c06e6eeead2e
Author:     Steven Rostedt <srostedt@...hat.com>
AuthorDate: Wed, 14 Oct 2009 15:43:40 -0400
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 15 Oct 2009 10:42:38 +0200

perf tools: Fix bprintk reading in trace output

The bprintk parsing was broken in more ways than one.

The file parsing was incorrect, and the words used by the
arguments are always 4 bytes aligned, even on 64-bit machines.

Signed-off-by: Steven Rostedt <srostedt@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
LKML-Reference: <20091014194359.520931637@...dmis.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/util/trace-event-parse.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index eda0a24..93a82fe 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -284,18 +284,16 @@ void parse_ftrace_printk(char *file, unsigned int size __unused)
 	char *line;
 	char *next = NULL;
 	char *addr_str;
-	int ret;
+	char *fmt;
 	int i;
 
 	line = strtok_r(file, "\n", &next);
 	while (line) {
 		item = malloc_or_die(sizeof(*item));
-		ret = sscanf(line, "%as : %as",
-			     (float *)(void *)&addr_str, /* workaround gcc warning */
-			     (float *)(void *)&item->printk);
+		addr_str = strtok_r(line, ":", &fmt);
 		item->addr = strtoull(addr_str, NULL, 16);
-		free(addr_str);
-
+		/* fmt still has a space, skip it */
+		item->printk = strdup(fmt+1);
 		item->next = list;
 		list = item;
 		line = strtok_r(NULL, "\n", &next);
@@ -2274,8 +2272,9 @@ static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struc
 			case 'u':
 			case 'x':
 			case 'i':
-				bptr = (void *)(((unsigned long)bptr + (long_size - 1)) &
-						~(long_size - 1));
+				/* the pointers are always 4 bytes aligned */
+				bptr = (void *)(((unsigned long)bptr + 3) &
+						~3);
 				switch (ls) {
 				case 0:
 				case 1:
--
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