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    Subject[PATCH 21/54] kernel: replace cpumask_weight with cpumask_empty in padata.c
    Date
    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>
    ---
    kernel/padata.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/kernel/padata.c b/kernel/padata.c
    index 18d3a5c699d8..e5819bb8bd1d 100644
    --- a/kernel/padata.c
    +++ b/kernel/padata.c
    @@ -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. */
    --
    2.30.2
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