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padata: replace cpumask_weight with cpumask_empty in padata.c

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padata_do_parallel() calls cpumask_weight() to check if any bit of a
given cpumask is set. We can do it more efficiently with cpumask_empty()
because cpumask_empty() stops traversing the cpumask as soon as it finds
first set bit, while cpumask_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Yury Norov 2022-01-23 10:38:52 -08:00 committed by Herbert Xu
parent 28e9b6d819
commit 1c4cafd115
1 changed files with 1 additions and 1 deletions
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kernel/padata.c
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@ -181,7 +181,7 @@ int padata_do_parallel(struct padata_shell *ps,
goto out;
if (!cpumask_test_cpu(*cb_cpu, pd->cpumask.cbcpu)) {
if (!cpumask_weight(pd->cpumask.cbcpu))
if (cpumask_empty(pd->cpumask.cbcpu))
goto out;
/* Select an alternate fallback CPU and notify the caller. */