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cpumask: replace cpumask_next_* with cpumask_first_* where appropriate

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cpumask_first() is a more effective analogue of 'next' version if n == -1
(which means start == 0). This patch replaces 'next' with 'first' where
things look trivial.

There's no cpumask_first_zero() function, so create it.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Yury Norov
2021-08-14 14:17:05 -07:00
parent 4ade0818cf
commit 9b51d9d866
6 changed files with 22 additions and 6 deletions
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4
kernel/time/clocksource.c
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@@ -257,7 +257,7 @@ static void clocksource_verify_choose_cpus(void)
return;
/* Make sure to select at least one CPU other than the current CPU. */
cpu = cpumask_next(-1, cpu_online_mask);
cpu = cpumask_first(cpu_online_mask);
if (cpu == smp_processor_id())
cpu = cpumask_next(cpu, cpu_online_mask);
if (WARN_ON_ONCE(cpu >= nr_cpu_ids))
@@ -279,7 +279,7 @@ static void clocksource_verify_choose_cpus(void)
cpu = prandom_u32() % nr_cpu_ids;
cpu = cpumask_next(cpu - 1, cpu_online_mask);
if (cpu >= nr_cpu_ids)
cpu = cpumask_next(-1, cpu_online_mask);
cpu = cpumask_first(cpu_online_mask);
if (!WARN_ON_ONCE(cpu >= nr_cpu_ids))
cpumask_set_cpu(cpu, &cpus_chosen);
}