linux-kernel - [RFC PATCH 6/9] arm: Tell irq work about self IPI support

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Date:	Thu, 21 Aug 2014 16:52:54 +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>,
	Kevin Hilman <khilman@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC PATCH 6/9] arm: Tell irq work about self IPI support

ARM irq work IPI support depends on SMP support. That information is
partly known at early boottime. Lets implement
arch_irq_work_has_own_interrupt() accordingly.

Cc: Catalin Iacob <iacobcatalin@...il.com>
Cc: Dave Jones <davej@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Kevin Hilman <khilman@...aro.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/arm/kernel/smp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 9388a3d..560c52e 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -506,6 +506,11 @@ void arch_irq_work_raise(void)
 	if (is_smp())
 		smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
 }
+
+int __init arch_irq_work_has_own_interrupt(void)
+{
+	return is_smp();
+}
 #endif
 
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
-- 
1.8.3.1

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