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Commit 07868b08 authored by Frederic Weisbecker's avatar Frederic Weisbecker
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tracing/function-graph-tracer: Drop the useless nmi protection 



The function graph tracer used to have a protection against NMI
while entering a function entry tracing. But this is useless now,
this tracer is reentrant and the ring buffer supports the NMI tracing.
We can then drop this protection.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
parent 0c9e6f63

arch/x86/kernel/ftrace.c

+0 −4
Original line number Original line Diff line number Diff line
@@ -417,10 +417,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, 
	unsigned long return_hooker = (unsigned long)

	unsigned long return_hooker = (unsigned long)

				&return_to_handler;

				&return_to_handler;





	/* Nmi's are currently unsupported */

	if (unlikely(in_nmi()))

		return;



	if (unlikely(atomic_read(&current->tracing_graph_pause)))

	if (unlikely(atomic_read(&current->tracing_graph_pause)))

		return;

		return;