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Wang Long authored
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@huawei.com> Acked-by:
Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
Jonathan Corbet <corbet@lwn.net>
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