linux-kernel - [PATCH] [CPUISOL] Do not route IRQs to the CPUs isolated at boot

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Message-Id: <1201493382-29804-4-git-send-email-maxk@qualcomm.com>
Date:	Sun, 27 Jan 2008 20:09:40 -0800
From:	maxk@...lcomm.com
To:	linux-kernel@...r.kernel.org
Cc:	Max Krasnyansky <maxk@...lcomm.com>
Subject: [PATCH] [CPUISOL] Do not route IRQs to the CPUs isolated at boot

From: Max Krasnyansky <maxk@...lcomm.com>

Most people would expect isolated CPUs to not get any
IRQs by default. This happens naturally if CPU is brought
off-line, marked isolated and then brought back online.

Signed-off-by: Max Krasnyansky <maxk@...lcomm.com>
---
 arch/x86/kernel/genapic_flat_64.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/genapic_flat_64.c b/arch/x86/kernel/genapic_flat_64.c
index 07352b7..e02e58c 100644
--- a/arch/x86/kernel/genapic_flat_64.c
+++ b/arch/x86/kernel/genapic_flat_64.c
@@ -21,7 +21,9 @@
 
 static cpumask_t flat_target_cpus(void)
 {
-	return cpu_online_map;
+	cpumask_t target;
+	cpus_andnot(target, cpu_online_map, cpu_isolated_map);
+	return target;
 }
 
 static cpumask_t flat_vector_allocation_domain(int cpu)
-- 
1.5.3.7

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