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. Cc: linuxppc-dev <[email protected]> Cc: LKML <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Anton Blanchard <[email protected]> Cc: Oliver O'Halloran <[email protected]> Cc: Nathan Lynch <[email protected]> Cc: Michael Neuling <[email protected]> Cc: Gautham R Shenoy <[email protected]> Cc: Satheesh Rajendran <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Valentin Schneider <[email protected]> Signed-off-by: Srikar Dronamraju <[email protected]> Tested-by: Satheesh Rajendran <[email protected]> --- 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 2e61a81aad88..c860c4950c9f 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 -- 2.17.1
