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Date: Sat, 20 Sep 2014 22:30:20 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: LKML <linux-kernel@...r.kernel.org> Cc: Frederic Weisbecker <fweisbec@...il.com>, Peter Zijlstra <peterz@...radead.org>, Dave Jones <davej@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Russell King <linux@....linux.org.uk>, Catalin Iacob <iacobcatalin@...il.com>, "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Will Deacon <will.deacon@....com>, Ingo Molnar <mingo@...nel.org>, Catalin Marinas <catalin.marinas@....com> Subject: [PATCH 4/8] 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@...radead.org> Cc: Ingo Molnar <mingo@...nel.org> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Signed-off-by: Frederic Weisbecker <fweisbec@...il.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..78162f8 --- /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 cpu_has_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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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