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x86: Tell irq work about self IPI support

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x86 supports irq work self-IPIs when local apic is available. This is
partly known on runtime so lets implement arch_irq_work_has_interrupt()
accordingly.

This should be safely called after setup_arch().

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Frederic Weisbecker 2014-08-16 18:47:15 +02:00
parent 76a33061b9
commit 3010279f0f
3 changed files with 12 additions and 2 deletions
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1
arch/x86/include/asm/Kbuild
View File

@ -7,6 +7,5 @@ genhdr-y += unistd_x32.h
generic-y += clkdev.h
generic-y += cputime.h
generic-y += early_ioremap.h
generic-y += irq_work.h
generic-y += mcs_spinlock.h
generic-y += scatterlist.h

11
arch/x86/include/asm/irq_work.h Normal file
View File

@ -0,0 +1,11 @@
#ifndef _ASM_IRQ_WORK_H
#define _ASM_IRQ_WORK_H
#include <asm/processor.h>
static inline bool arch_irq_work_has_interrupt(void)
{
return cpu_has_apic;
}
#endif /* _ASM_IRQ_WORK_H */

2
arch/x86/kernel/irq_work.c
View File

@ -41,7 +41,7 @@ __visible void smp_trace_irq_work_interrupt(struct pt_regs *regs)
void arch_irq_work_raise(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
if (!cpu_has_apic)
if (!arch_irq_work_has_interrupt())
return;
apic->send_IPI_self(IRQ_WORK_VECTOR);