From 53516d4abacfab1faaa075c1f79957abc3da358c Mon Sep 17 00:00:00 2001 From: Srikar Dronamraju Date: Mon, 21 Sep 2020 15:26:47 +0530 Subject: [PATCH] powerpc/smp: Limit CPUs traversed to within a node. All the arch specific topology cpumasks are within a node/DIE. However when setting these per CPU cpumasks, system traverses through all the online CPUs. This is redundant. Reduce the traversal to only CPUs that are online in the node to which the CPU belongs to. Signed-off-by: Srikar Dronamraju Tested-by: Satheesh Rajendran Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200921095653.9701-6-srikar@linux.vnet.ibm.com --- arch/powerpc/kernel/smp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 9cdb966f00b39..9455af47123c6 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -1241,7 +1241,7 @@ static bool update_mask_by_l2(int cpu, struct cpumask *(*mask_fn)(int)) } cpumask_set_cpu(cpu, mask_fn(cpu)); - for_each_cpu(i, cpu_online_mask) { + for_each_cpu_and(i, cpu_online_mask, cpu_cpu_mask(cpu)) { /* * when updating the marks the current CPU has not been marked * online, but we need to update the cache masks -- 2.30.2