[GIT PULL] x86/irq change for v4.12

From: Ingo Molnar
Date: Mon May 01 2017 - 07:42:06 EST


Linus,

Please pull the latest x86-irq-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-irq-for-linus

# HEAD: c0edbd4a1693600d6eb9e2faad452638c35391f7 x86/irq: Optimize free vector check in the CPU offline path

A single commit that micro-optimizes an IRQ vectors code path in the CPU offlining
code.

Thanks,

Ingo

------------------>
Chen Yu (1):
x86/irq: Optimize free vector check in the CPU offline path


arch/x86/kernel/irq.c | 9 +++++++--
1 file 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;
+ }
}
}