From: Chen Yu Date: Sun, 16 Apr 2017 15:43:30 +0000 (+0800) Subject: x86/irq: Optimize free vector check in the CPU offline path X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c0edbd4a1693600d6eb9e2faad452638c35391f7;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git x86/irq: Optimize free vector check in the CPU offline path Before offlining a CPU its required to check whether there are enough free irq vectors available so interrupts can be migrated away from the CPU. This check is executed whether its required or not and neither stops searching when the number of required free vectors are reached. Bypass the free vector check if the current CPU has no irq to migrate and leave the for_each_online_cpu() loop when the free vector count reaches the number of required vectors. Suggested-by: Thomas Gleixner Signed-off-by: Chen Yu Cc: Prarit Bhargava Cc: Len Brown Cc: "Rafael J. Wysocki" Link: http://lkml.kernel.org/r/1492357410-510-1-git-send-email-yu.c.chen@intel.com Signed-off-by: Thomas Gleixner --- 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; + } } }