linux-kernel - [RFC PATCH 7/9] arm64: Tell irq work about self IPI support

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Message-Id: <1408632777-3348-8-git-send-email-fweisbec@gmail.com>
Date:	Thu, 21 Aug 2014 16:52:55 +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>,
	Catalin Marinas <catalin.marinas@....com>,
	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Larry Bassel <larry.bassel@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC PATCH 7/9] arm64: Tell irq work about self IPI support

ARM64 irq work support depends on __smp_cross_call to point to some
relevant IRQ controller operations. This information should be available
after the call to init_IRQ().

Lets implement arch_irq_work_has_own_interrupt() accordingly.

Cc: Catalin Iacob <iacobcatalin@...il.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Dave Jones <davej@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Larry Bassel <larry.bassel@...aro.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/arm64/kernel/smp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 4743397..b3e8b9e 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -534,6 +534,11 @@ void arch_irq_work_raise(void)
 	if (__smp_cross_call)
 		smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
 }
+
+int __init arch_irq_work_has_own_interrupt(void)
+{
+	return !!__smp_cross_call;
+}
 #endif
 
 static DEFINE_RAW_SPINLOCK(stop_lock);
-- 
1.8.3.1

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