Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.17 10/25] x86: Tell irq work about self IPI support | Date | Mon, 13 Oct 2014 04:25:03 +0200 |
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3.17-stable review patch. If anyone has any objections, please let me know.
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From: Frederic Weisbecker <fweisbec@gmail.com>
commit 3010279f0fc36f0388872203e63ca49912f648fd upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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(-)
--- 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 --- /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 */ --- a/arch/x86/kernel/irq_work.c +++ b/arch/x86/kernel/irq_work.c @@ -41,7 +41,7 @@ __visible void smp_trace_irq_work_interr 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);
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