Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
powerpc/xmon: simplify xmon_batch_next_cpu()
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>
+1
-5
+1
-5
arch/powerpc/xmon/xmon.c
+1
-5
arch/powerpc/xmon/xmon.c
···
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1271
{
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unsigned long cpu;
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-
while (!cpumask_empty(&xmon_batch_cpus)) {
1275
-
cpu = cpumask_next_wrap(smp_processor_id(), &xmon_batch_cpus,
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xmon_batch_start_cpu, true);
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-
if (cpu >= nr_cpu_ids)
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-
break;
1274
+
for_each_cpu_wrap(cpu, &xmon_batch_cpus, xmon_batch_start_cpu) {
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if (xmon_batch_start_cpu == -1)
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xmon_batch_start_cpu = cpu;
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if (xmon_switch_cpu(cpu))