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

[tip-bot for Thomas Gleixner]

Commit-ID:  9ac15b7a8af4cf3337a101498c0ed690d23ade75
Gitweb:     http://git.kernel.org/tip/9ac15b7a8af4cf3337a101498c0ed690d23ade75
Author:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Thu, 31 Dec 2015 16:30:49 +0000
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Tested-by: Borislav Petkov <bp@xxxxxxxxx>
Tested-by: Joe Lawrence <joe.lawrence@xxxxxxxxxxx>
Cc: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Cc: Jeremiah Mahler <jmmahler@xxxxxxxxx>
Cc: andy.shevchenko@xxxxxxxxx
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx #4.3+
Link: http://lkml.kernel.org/r/20151231160106.640253454@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 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;
 		}