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authorLinus Torvalds <torvalds@linux-foundation.org>2017-05-01 23:03:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-01 23:03:17 -0700
commit888411be09739443271d254c9d8c1f5188c05509 (patch)
treef975a500cddf693695e3091da70f468296969491 /arch
parent7d6a31c394722c914c61292b457e1999c8bef5ea (diff)
parentc0edbd4a1693600d6eb9e2faad452638c35391f7 (diff)
downloadlinux-888411be09739443271d254c9d8c1f5188c05509.tar.bz2
Merge branch 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 irq update from Ingo Molnar: "A single commit that micro-optimizes an IRQ vectors code path in the CPU offlining code" * 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/irq: Optimize free vector check in the CPU offline path
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/irq.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 4d8183b5f113..f34fe7444836 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -394,6 +394,9 @@ int check_irq_vectors_for_cpu_disable(void)
!cpumask_subset(&affinity_new, &online_new))
this_count++;
}
+ /* No need to check any further. */
+ if (!this_count)
+ return 0;
count = 0;
for_each_online_cpu(cpu) {
@@ -411,8 +414,10 @@ int check_irq_vectors_for_cpu_disable(void)
for (vector = FIRST_EXTERNAL_VECTOR;
vector < first_system_vector; vector++) {
if (!test_bit(vector, used_vectors) &&
- IS_ERR_OR_NULL(per_cpu(vector_irq, cpu)[vector]))
- count++;
+ IS_ERR_OR_NULL(per_cpu(vector_irq, cpu)[vector])) {
+ if (++count == this_count)
+ return 0;
+ }
}
}