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tracing: Use CONFIG_PREEMPTION

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CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT.
Both PREEMPT and PREEMPT_RT require the same functionality which today
depends on CONFIG_PREEMPT.

Add additional header output for PREEMPT_RT.
Link: http://lkml.kernel.org/r/20191015191821.11479-34-bigeasy@linutronix.de

Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Sebastian Andrzej Siewior 2019-10-15 21:18:20 +02:00 committed by Steven Rostedt (VMware)
parent 793937236d
commit 9c34fc4b7e
2 changed files with 3 additions and 1 deletions
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2
Documentation/trace/ftrace-uses.rst
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@ -146,7 +146,7 @@ FTRACE_OPS_FL_RECURSION_SAFE
itself or any nested functions that those functions call.
If this flag is set, it is possible that the callback will also
be called with preemption enabled (when CONFIG_PREEMPT is set),
be called with preemption enabled (when CONFIG_PREEMPTION is set),
but this is not guaranteed.
FTRACE_OPS_FL_IPMODIFY

2
kernel/trace/trace.c
View File

@ -3726,6 +3726,8 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
"desktop",
#elif defined(CONFIG_PREEMPT)
"preempt",
#elif defined(CONFIG_PREEMPT_RT)
"preempt_rt",
#else
"unknown",
#endif