linux-kernel - [RFC PATCH 5/9] x86: Implement arch_irq_work_has

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Date:	Mon, 29 Oct 2012 14:28:12 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [RFC PATCH 5/9] x86: Implement arch_irq_work_has_ipi()

Most of the time, x86 can trigger self-IPIs. Tell
irq work subsystem about it.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 arch/x86/include/asm/irq_work.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/irq_work.h b/arch/x86/include/asm/irq_work.h
index dad8266..c7489cd 100644
--- a/arch/x86/include/asm/irq_work.h
+++ b/arch/x86/include/asm/irq_work.h
@@ -2,8 +2,12 @@
 #define _ASM_X86_IRQ_WORK_H
 
 #ifdef CONFIG_X86_LOCAL_APIC
+#include <asm/cpufeature.h>
+
 extern void __arch_irq_work_raise(void);
 #define arch_irq_work_raise __arch_irq_work_raise
+
+#define arch_irq_work_has_ipi() (cpu_has_apic)
 #endif
 
 #include <asm-generic/irq_work.h>
-- 
1.7.5.4

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