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Merge branch 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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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
This commit is contained in:
Linus Torvalds 2017-05-01 23:03:17 -07:00
parent 7d6a31c394 c0edbd4a16
commit 888411be09
1 changed files with 7 additions and 2 deletions
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9
arch/x86/kernel/irq.c
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@ -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;
}
}
}