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docs: ftrace: Correct access mode 

The documentation gives an example for opening trace marker with
write-only mode, but the flag WR_ONLY is not defined by glibc.

Use O_WRONLY to replace it.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20221008083250.3160-1-leo.yan@linaro.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Leo Yan 2022-10-08 08:32:50 +00:00 committed by Jonathan Corbet
parent 69d517e6e2
commit 9c1ab6d54a
1 changed files with 1 additions and 1 deletions
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2
Documentation/trace/ftrace.rst
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@ -564,7 +564,7 @@ of ftrace. Here is a list of some of the key files:
start::
trace_fd = open("trace_marker", WR_ONLY);
trace_fd = open("trace_marker", O_WRONLY);
Note: Writing into the trace_marker file can also initiate triggers
that are written into /sys/kernel/tracing/events/ftrace/print/trigger