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 <[email protected]>
Tested-by: Borislav Petkov <[email protected]>
Tested-by: Joe Lawrence <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Jeremiah Mahler <[email protected]>
Cc: [email protected]
Cc: Guenter Roeck <[email protected]>
Cc: [email protected] #4.3+
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 940e18d4dbcda437b34c17e12495488ca1f732a0..1bd29c624531c9f9868bc0389356260b0c774b84 100644 (file)
--- 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;
                }