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    Subject[PATCH 4/8] x86: Tell irq work about self IPI support
    Date
    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().

    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>
    ---
    arch/x86/include/asm/Kbuild | 1 -
    arch/x86/include/asm/irq_work.h | 11 +++++++++++
    arch/x86/kernel/irq_work.c | 2 +-
    3 files changed, 12 insertions(+), 2 deletions(-)
    create mode 100644 arch/x86/include/asm/irq_work.h

    diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
    index 8fa909c..3bf000f 100644
    --- a/arch/x86/include/asm/Kbuild
    +++ b/arch/x86/include/asm/Kbuild
    @@ -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
    diff --git a/arch/x86/include/asm/irq_work.h b/arch/x86/include/asm/irq_work.h
    new file mode 100644
    index 0000000..4c01cab
    --- /dev/null
    +++ b/arch/x86/include/asm/irq_work.h
    @@ -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 static_cpu_has(X86_FEATURE_APIC);
    +}
    +
    +#endif /* _ASM_IRQ_WORK_H */
    diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c
    index 1de84e3..15d741d 100644
    --- a/arch/x86/kernel/irq_work.c
    +++ b/arch/x86/kernel/irq_work.c
    @@ -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);
    --
    2.1.0


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