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x86/smp: Remove pointless duplicated interrupt code

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Two NOP5s are really a good tradeoff vs. the unholy IDT switching mess,
which duplicates code all over the place. The rescheduling interrupt gets
optimized in a later step.

Make the ordering of function call and statistics increment the same as in
other places. Calculate stats first, then do the function call.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170828064957.222101344@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2017-08-28 08:47:29 +02:00 committed by Ingo Molnar
parent 0f42ae283c
commit 85b77cdd8f
2 changed files with 9 additions and 38 deletions
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4
arch/x86/include/asm/hw_irq.h
View File

@ -49,8 +49,8 @@ extern asmlinkage void call_function_single_interrupt(void);
#ifdef CONFIG_TRACING
/* Interrupt handlers registered during init_IRQ */
extern void trace_reschedule_interrupt(void);
extern void trace_call_function_interrupt(void);
extern void trace_call_function_single_interrupt(void);
#define trace_call_function_interrupt call_function_interrupt
#define trace_call_function_single_interrupt call_function_single_interrupt
#define trace_thermal_interrupt thermal_interrupt
#define trace_threshold_interrupt threshold_interrupt
#define trace_deferred_error_interrupt deferred_error_interrupt

43
arch/x86/kernel/smp.c
View File

@ -281,57 +281,28 @@ __visible void __irq_entry smp_trace_reschedule_interrupt(struct pt_regs *regs)
*/
ipi_entering_ack_irq();
trace_reschedule_entry(RESCHEDULE_VECTOR);
__smp_reschedule_interrupt();
inc_irq_stat(irq_resched_count);
scheduler_ipi();
trace_reschedule_exit(RESCHEDULE_VECTOR);
exiting_irq();
/*
* KVM uses this interrupt to force a cpu out of guest mode
*/
}
static inline void __smp_call_function_interrupt(void)
{
generic_smp_call_function_interrupt();
inc_irq_stat(irq_call_count);
}
__visible void __irq_entry smp_call_function_interrupt(struct pt_regs *regs)
{
ipi_entering_ack_irq();
__smp_call_function_interrupt();
exiting_irq();
}
__visible void __irq_entry
smp_trace_call_function_interrupt(struct pt_regs *regs)
{
ipi_entering_ack_irq();
trace_call_function_entry(CALL_FUNCTION_VECTOR);
__smp_call_function_interrupt();
inc_irq_stat(irq_call_count);
generic_smp_call_function_interrupt();
trace_call_function_exit(CALL_FUNCTION_VECTOR);
exiting_irq();
}
static inline void __smp_call_function_single_interrupt(void)
{
generic_smp_call_function_single_interrupt();
inc_irq_stat(irq_call_count);
}
__visible void __irq_entry
smp_call_function_single_interrupt(struct pt_regs *regs)
{
ipi_entering_ack_irq();
__smp_call_function_single_interrupt();
exiting_irq();
}
__visible void __irq_entry
smp_trace_call_function_single_interrupt(struct pt_regs *regs)
__visible void __irq_entry smp_call_function_single_interrupt(struct pt_regs *r)
{
ipi_entering_ack_irq();
trace_call_function_single_entry(CALL_FUNCTION_SINGLE_VECTOR);
__smp_call_function_single_interrupt();
inc_irq_stat(irq_call_count);
generic_smp_call_function_single_interrupt();
trace_call_function_single_exit(CALL_FUNCTION_SINGLE_VECTOR);
exiting_irq();
}