This is a note to let you know that I've just added the patch titled
x86: Tell irq work about self IPI support
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-tell-irq-work-about-self-ipi-support.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 3010279f0fc36f0388872203e63ca49912f648fd Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <[email protected]>
Date: Sat, 16 Aug 2014 18:47:15 +0200
Subject: x86: Tell irq work about self IPI support
From: Frederic Weisbecker <[email protected]>
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) <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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);
Patches currently in stable-queue which might be from [email protected] are
queue-3.17/irq_work-force-raised-irq-work-to-run-on-irq-work-interrupt.patch
queue-3.17/arm-tell-irq-work-about-self-ipi-support.patch
queue-3.17/irq_work-introduce-arch_irq_work_has_interrupt.patch
queue-3.17/x86-tell-irq-work-about-self-ipi-support.patch
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