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x86/smp: Use static key for reschedule interrupt tracing

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It's worth to avoid the extra irq_enter()/irq_exit() pair in the case that
the reschedule interrupt tracepoints are disabled.

Use the static key which indicates that exception tracing is enabled. For
now this key is global. It will be optimized in a later step.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170828064957.299808677@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner
2017-08-28 08:47:30 +02:00
committed by Ingo Molnar
parent 85b77cdd8f
commit 3cd788c1ee
2 changed files with 16 additions and 26 deletions
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2
arch/x86/include/asm/hw_irq.h
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@@ -48,7 +48,7 @@ extern asmlinkage void call_function_single_interrupt(void);
#ifdef CONFIG_TRACING
/* Interrupt handlers registered during init_IRQ */
extern void trace_reschedule_interrupt(void);
#define trace_reschedule_interrupt reschedule_interrupt
#define trace_call_function_interrupt call_function_interrupt
#define trace_call_function_single_interrupt call_function_single_interrupt
#define trace_thermal_interrupt thermal_interrupt