linux-kernel - [RFC PATCH 5/9] x86: Tell irq work about self IPI support

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Date:	Thu, 21 Aug 2014 16:52:53 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Catalin Iacob <iacobcatalin@...il.com>,
	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC PATCH 5/9] x86: Tell irq work about self IPI support

x86 supports irq work when local apic is available. This is partly known
on runtime so lets implement arch_irq_work_has_own_interrupt()
accordingly.

This should be safely called after setup_arch().

Cc: Catalin Iacob <iacobcatalin@...il.com>
Cc: Dave Jones <davej@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/x86/kernel/irq_work.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c
index 54f60a2..b5f8fff 100644
--- a/arch/x86/kernel/irq_work.c
+++ b/arch/x86/kernel/irq_work.c
@@ -38,6 +38,11 @@ __visible void smp_trace_irq_work_interrupt(struct pt_regs *regs)
 	exiting_irq();
 }
 
+int __init arch_irq_work_has_own_interrupt(void)
+{
+	return cpu_has_apic;
+}
+
 void arch_irq_work_raise(void)
 {
 	if (!cpu_has_apic)
-- 
1.8.3.1

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