xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE

Browse Source 
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
This commit is contained in:
Thomas Gleixner
2020-05-21 22:05:45 +02:00
parent cb09ea2924
commit 13cad9851e
9 changed files with 7 additions and 63 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
arch/x86/kernel/smp.c
View File

@@ -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)