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powerpc/xmon: simplify xmon_batch_next_cpu()

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The function opencodes for_each_cpu_wrap() macro. As a loop termination
condition it uses cpumask_empty(), which is O(N), and it makes the whole
algorithm O(N^2). Switching to for_each_cpu_wrap() simplifies the logic,
and makes the algorithm linear.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
This commit is contained in:
Yury Norov
2025-01-28 11:46:33 -05:00
parent 2a402aa64c
commit 40ba13b430
1 changed files with 1 additions and 5 deletions
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6
arch/powerpc/xmon/xmon.c
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@@ -1271,11 +1271,7 @@ static int xmon_batch_next_cpu(void)
{
unsigned long cpu;
while (!cpumask_empty(&xmon_batch_cpus)) {
cpu = cpumask_next_wrap(smp_processor_id(), &xmon_batch_cpus,
xmon_batch_start_cpu, true);
if (cpu >= nr_cpu_ids)
break;
for_each_cpu_wrap(cpu, &xmon_batch_cpus, xmon_batch_start_cpu) {
if (xmon_batch_start_cpu == -1)
xmon_batch_start_cpu = cpu;
if (xmon_switch_cpu(cpu))