linux-kernel - [PATCH 1/5] ftrace: remove redundant strsep in mod

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Date:	Tue, 29 Sep 2015 19:46:12 +0300
From:	Dmitry Safonov <0x7f454c46@...il.com>
To:	rostedt@...dmis.org
Cc:	mingo@...hat.com, corbet@....net, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Dmitry Safonov <0x7f454c46@...il.com>
Subject: [PATCH 1/5] ftrace: remove redundant strsep in mod_callback

By now there isn't any subcommand for mod.

Before:
	sh$ echo '*:mod:ipv6:a' > set_ftrace_filter
	sh$ echo '*:mod:ipv6' > set_ftrace_filter
had the same results, but now first will result in:
	sh$ echo '*:mod:ipv6:a' > set_ftrace_filter
	-bash: echo: write error: Invalid argument

Also, I clarified ftrace_mod_callback code a little.

Signed-off-by: Dmitry Safonov <0x7f454c46@...il.com>
---
 kernel/trace/ftrace.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index b0623ac..f87401b 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3564,8 +3564,7 @@ static int
 ftrace_mod_callback(struct ftrace_hash *hash,
 		    char *func, char *cmd, char *param, int enable)
 {
-	char *mod;
-	int ret = -EINVAL;
+	int ret;
 
 	/*
 	 * cmd == 'mod' because we only registered this func
@@ -3576,16 +3575,12 @@ ftrace_mod_callback(struct ftrace_hash *hash,
 	 */
 
 	/* we must have a module name */
-	if (!param)
-		return ret;
-
-	mod = strsep(&param, ":");
-	if (!strlen(mod))
-		return ret;
+	if (!param || !strlen(param))
+		return -EINVAL;
 
-	ret = ftrace_match_module_records(hash, func, mod);
-	if (!ret)
-		ret = -EINVAL;
+	ret = ftrace_match_module_records(hash, func, param);
+	if (ret == 0)
+		return -EINVAL;
 	if (ret < 0)
 		return ret;
 
-- 
2.5.3

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