3.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: Frederic Weisbecker <fweis...@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) <pet...@infradead.org>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
