x86: Tell irq work about self IPI support
authorFrederic Weisbecker <fweisbec@gmail.com>
Sat, 16 Aug 2014 16:47:15 +0000 (18:47 +0200)
committerFrederic Weisbecker <fweisbec@gmail.com>
Sat, 13 Sep 2014 16:38:29 +0000 (18:38 +0200)
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>
arch/x86/include/asm/Kbuild
arch/x86/include/asm/irq_work.h [new file with mode: 0644]
arch/x86/kernel/irq_work.c

index 8fa909cc655368d088401f53406f280e6460c96a..3bf000fab0aeb51b3fa23bfa1faca8b3a581febc 100644 (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
diff --git a/arch/x86/include/asm/irq_work.h b/arch/x86/include/asm/irq_work.h
new file mode 100644 (file)
index 0000000..78162f8
--- /dev/null
@@ -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 */
index 1de84e3ab4e0737df845648aad772e815908c2f8..15d741ddfeeb7c4497e28052e1ad7ea08e68c252 100644 (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);