linux-kernel - [PATCH] x86/fixup_irq: using the cpu_online_mask instead of cpu_all

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Date:	Tue, 14 Aug 2012 06:55:01 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	"'linux-kernel@...r.kernel.org' (linux-kernel@...r.kernel.org)" 
	<linux-kernel@...r.kernel.org>
CC:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"Yanmin Zhang <yanmin_zhang@...ux.intel.com>
	(yanmin_zhang@...ux.intel.com)" <yanmin_zhang@...ux.intel.com>
Subject: [PATCH] x86/fixup_irq: using the cpu_online_mask instead of
 cpu_all_mask

From: liu chuansheng <chuansheng.liu@...el.com>
Subject: [PATCH] x86/fixup_irq: using the cpu_online_mask instead of cpu_all_mask

When one CPU is going down, and this CPU is the last one in irq affinity,
current code is setting cpu_all_mask as the new affinity for that irq.

But for some system the firmware maybe send the interrupt to each CPU
in irq affinity averagely, and cpu_all_mask include all CPUs.

Here replacing cpu_all_mask with cpu_online_mask, it is more reasonable
and fittable.

Signed-off-by: liu chuansheng <chuansheng.liu@...el.com>
---
 arch/x86/kernel/irq.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 7ad683d..d44f782 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -270,7 +270,7 @@ void fixup_irqs(void)
 
                if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
                        break_affinity = 1;
-                       affinity = cpu_all_mask;
+                       affinity = cpu_online_mask;
                }
 
                chip = irq_data_get_irq_chip(data);
-- 
1.7.0.4

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