linux-kernel - [PATCH] Documentation: Fix the wrong command `echo -1 > set_ftrace

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Date:	Thu, 5 Feb 2015 05:16:14 +0000
From:	Wang Long <long.wanglong@...wei.com>
To:	<rostedt@...dmis.org>, <mingo@...hat.com>, <corbet@....net>
CC:	<linux-doc@...r.kernel.or>, <linux-kernel@...r.kernel.org>,
	<peifeiyue@...wei.com>, <long.wanglong@...wei.com>
Subject: [PATCH] Documentation: Fix the wrong command `echo -1 >  set_ftrace_pid` for cleaning the filter.

The command `echo > set_ftrace_pid` should be used to clean the filter quietly.
because the command `echo -1 >  set_ftrace_pid` will output the following:
"bash: echo: write error: Invalid argument".

so update the file Documentation/trace/ftrace.txt.

Signed-off-by: Wang Long <long.wanglong@...wei.com>
---
 Documentation/trace/ftrace.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index 8408e04..572ca92 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -1740,7 +1740,7 @@ no pid
      yum-updatesd-3111  [003]  1637.254683: lock_hrtimer_base <-hrtimer_try_to_cancel
      yum-updatesd-3111  [003]  1637.254685: fget_light <-do_sys_poll
      yum-updatesd-3111  [003]  1637.254686: pipe_poll <-do_sys_poll
-# echo -1 > set_ftrace_pid
+# echo > set_ftrace_pid
 # cat trace |head
  # tracer: function
  #
-- 
1.8.3.4

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