Messages in this thread Patch in this message | | | Date | Mon, 1 May 2017 13:40:01 +0200 | From | Ingo Molnar <> | Subject | [GIT PULL] x86/irq change for v4.12 |
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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; + } } }
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