From 7d49b28a80b830c3ca876d33bedc58d62a78e16f Mon Sep 17 00:00:00 2001 From: Rik van Riel Date: Tue, 25 Sep 2018 23:58:41 -0400 Subject: smp,cpumask: introduce on_each_cpu_cond_mask Introduce a variant of on_each_cpu_cond that iterates only over the CPUs in a cpumask, in order to avoid making callbacks for every single CPU in the system when we only need to test a subset. Cc: npiggin@gmail.com Cc: mingo@kernel.org Cc: will.deacon@arm.com Cc: songliubraving@fb.com Cc: kernel-team@fb.com Cc: hpa@zytor.com Cc: luto@kernel.org Signed-off-by: Rik van Riel Signed-off-by: Peter Zijlstra (Intel) Link: http://lkml.kernel.org/r/20180926035844.1420-5-riel@surriel.com --- kernel/smp.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'kernel/smp.c') diff --git a/kernel/smp.c b/kernel/smp.c index a7d4f9f50a49..163c451af42e 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -669,9 +669,9 @@ EXPORT_SYMBOL(on_each_cpu_mask); * You must not call this function with disabled interrupts or * from a hardware interrupt handler or from a bottom half handler. */ -void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), +void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info), smp_call_func_t func, void *info, bool wait, - gfp_t gfp_flags) + gfp_t gfp_flags, const struct cpumask *mask) { cpumask_var_t cpus; int cpu, ret; @@ -680,7 +680,7 @@ void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), if (likely(zalloc_cpumask_var(&cpus, (gfp_flags|__GFP_NOWARN)))) { preempt_disable(); - for_each_online_cpu(cpu) + for_each_cpu(cpu, mask) if (cond_func(cpu, info)) __cpumask_set_cpu(cpu, cpus); on_each_cpu_mask(cpus, func, info, wait); @@ -692,7 +692,7 @@ void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), * just have to IPI them one by one. */ preempt_disable(); - for_each_online_cpu(cpu) + for_each_cpu(cpu, mask) if (cond_func(cpu, info)) { ret = smp_call_function_single(cpu, func, info, wait); @@ -701,6 +701,15 @@ void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), preempt_enable(); } } +EXPORT_SYMBOL(on_each_cpu_cond_mask); + +void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), + smp_call_func_t func, void *info, bool wait, + gfp_t gfp_flags) +{ + on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, + cpu_online_mask); +} EXPORT_SYMBOL(on_each_cpu_cond); static void do_nothing(void *unused) -- cgit v1.2.3