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| author |  Thomas Gleixner <tglx@linutronix.de>
| 2020-05-21 22:05:45 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de>
| 2020-06-11 15:15:16 +0200 |
| commit | 13cad9851ef1d004640991d45227dd35c08f45fc (patch) | |
| tree | 2860cb1e13764f0590687a87300e16c30aebd268 /arch/x86/kernel/smp.c | |
| parent | x86/entry: Convert XEN hypercall vector to IDTENTRY_SYSVEC (diff) | |
| download | linux-13cad9851ef1d004640991d45227dd35c08f45fc.tar.gz linux-13cad9851ef1d004640991d45227dd35c08f45fc.tar.bz2 linux-13cad9851ef1d004640991d45227dd35c08f45fc.zip | |
x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE
The scheduler IPI does not need the full interrupt entry handling logic
when the entry is from kernel mode. Use IDTENTRY_SYSVEC_SIMPLE and spare
all the overhead.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202119.835425642@linutronix.de
Diffstat (limited to 'arch/x86/kernel/smp.c')
| -rw-r--r-- | arch/x86/kernel/smp.c | 19 |
1 files changed, 4 insertions, 15 deletions
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index e5647daa7e96..eff4ce3b10da 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -220,26 +220,15 @@ static void native_stop_other_cpus(int wait) /* * Reschedule call back. KVM uses this interrupt to force a cpu out of - * guest mode + * guest mode. */ -__visible void __irq_entry smp_reschedule_interrupt(struct pt_regs *regs) +DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi) { ack_APIC_irq(); + trace_reschedule_entry(RESCHEDULE_VECTOR); inc_irq_stat(irq_resched_count); - - if (trace_resched_ipi_enabled()) { - /* - * scheduler_ipi() might call irq_enter() as well, but - * nested calls are fine. - */ - irq_enter(); - trace_reschedule_entry(RESCHEDULE_VECTOR); - scheduler_ipi(); - trace_reschedule_exit(RESCHEDULE_VECTOR); - irq_exit(); - return; - } scheduler_ipi(); + trace_reschedule_exit(RESCHEDULE_VECTOR); } DEFINE_IDTENTRY_SYSVEC(sysvec_call_function) |