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x86: Tell irq work about self IPI support
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>
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parent
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3 changed files with 12 additions and 2 deletions
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@ -7,6 +7,5 @@ genhdr-y += unistd_x32.h
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generic-y += clkdev.h
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generic-y += cputime.h
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generic-y += early_ioremap.h
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generic-y += irq_work.h
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generic-y += mcs_spinlock.h
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generic-y += scatterlist.h
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11
arch/x86/include/asm/irq_work.h
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11
arch/x86/include/asm/irq_work.h
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@ -0,0 +1,11 @@
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#ifndef _ASM_IRQ_WORK_H
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#define _ASM_IRQ_WORK_H
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#include <asm/processor.h>
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static inline bool arch_irq_work_has_interrupt(void)
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{
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return cpu_has_apic;
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}
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#endif /* _ASM_IRQ_WORK_H */
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@ -41,7 +41,7 @@ __visible void smp_trace_irq_work_interrupt(struct pt_regs *regs)
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void arch_irq_work_raise(void)
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{
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#ifdef CONFIG_X86_LOCAL_APIC
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if (!cpu_has_apic)
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if (!arch_irq_work_has_interrupt())
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return;
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apic->send_IPI_self(IRQ_WORK_VECTOR);
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