linux-kernel - [tip:tracing/urgent] ksym_tracer: Fix to allow writing newline to ksym_trace

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Date:	Wed, 30 Dec 2009 09:31:10 GMT
From:	tip-bot for Li Zefan <lizf@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	lizf@...fujitsu.com, fweisbec@...il.com, rostedt@...dmis.org,
	tglx@...utronix.de, mingo@...e.hu, prasad@...ux.vnet.ibm.com
Subject: [tip:tracing/urgent] ksym_tracer: Fix to allow writing newline to ksym_trace_filter

Commit-ID:  3d13ec2efdb5843ad91e57b60d50b44d922cf063
Gitweb:     http://git.kernel.org/tip/3d13ec2efdb5843ad91e57b60d50b44d922cf063
Author:     Li Zefan <lizf@...fujitsu.com>
AuthorDate: Wed, 30 Dec 2009 14:23:19 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 30 Dec 2009 07:50:49 +0100

ksym_tracer: Fix to allow writing newline to ksym_trace_filter

It used to work, but now doesn't:

 # echo > ksym_filter
 bash: echo: write error: Invalid argument

It's caused by d954fbf0ff6b5fdfb32350e85a2f15d3db976506
("tracing: Fix wrong usage of strstrip in trace_ksyms").

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: K.Prasad <prasad@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <4B3AF1D7.5040400@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/trace/trace_ksym.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
index 340b6ff..160a8d8 100644
--- a/kernel/trace/trace_ksym.c
+++ b/kernel/trace/trace_ksym.c
@@ -299,8 +299,8 @@ static ssize_t ksym_trace_filter_write(struct file *file,
 	 * 2: echo 0 > ksym_trace_filter
 	 * 3: echo "*:---" > ksym_trace_filter
 	 */
-	if (!buf[0] || !strcmp(buf, "0") ||
-	    !strcmp(buf, "*:---")) {
+	if (!input_string[0] || !strcmp(input_string, "0") ||
+	    !strcmp(input_string, "*:---")) {
 		__ksym_trace_reset();
 		ret = 0;
 		goto out;
--
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