linux-kernel - [tip:x86/urgent] x86/irq: Copy vectormask instead of an AND operation

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Date:	Sat, 16 Jan 2016 13:18:12 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux@...ck-us.net, tglx@...utronix.de, jiang.liu@...ux.intel.com,
	linux-kernel@...r.kernel.org, joe.lawrence@...atus.com,
	bp@...en8.de, mingo@...nel.org, jmmahler@...il.com, hpa@...or.com
Subject: [tip:x86/urgent] x86/irq:
  Copy vectormask instead of an AND operation

Commit-ID:  9ac15b7a8af4cf3337a101498c0ed690d23ade75
Gitweb:     http://git.kernel.org/tip/9ac15b7a8af4cf3337a101498c0ed690d23ade75
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Thu, 31 Dec 2015 16:30:49 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 15 Jan 2016 13:44:00 +0100

x86/irq: Copy vectormask instead of an AND operation

In the case that the new vector mask is a subset of the existing mask there is
no point to do a AND operation of currentmask & newmask. The result is
newmask. So we can simply copy the new mask to the current mask and be done
with it. Preparatory patch for further consolidation.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Borislav Petkov <bp@...en8.de>
Tested-by: Joe Lawrence <joe.lawrence@...atus.com>
Cc: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Jeremiah Mahler <jmmahler@...il.com>
Cc: andy.shevchenko@...il.com
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: stable@...r.kernel.org #4.3+
Link: http://lkml.kernel.org/r/20151231160106.640253454@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/apic/vector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 940e18d..1bd29c6 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -156,7 +156,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
 				       vector_cpumask);
 			d->move_in_progress =
 			   cpumask_intersects(d->old_domain, cpu_online_mask);
-			cpumask_and(d->domain, d->domain, vector_cpumask);
+			cpumask_copy(d->domain, vector_cpumask);
 			goto success;
 		}