Commit 9c34fc4b authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Steven Rostedt (VMware)
Browse files

tracing: Use CONFIG_PREEMPTION 

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: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 79393723

Documentation/trace/ftrace-uses.rst

+1 −1
Original line number Diff line number Diff line
@@ -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

kernel/trace/trace.c

+2 −0
Original line number Diff line number Diff line
@@ -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

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