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    Subject[PATCH 13/54] arch/alpha: replace cpumask_weight with cpumask_empty where appropriate
    Date
    common_shutdown_1() 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>
    ---
    arch/alpha/kernel/process.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
    index 5f8527081da9..0d4bc60828bf 100644
    --- a/arch/alpha/kernel/process.c
    +++ b/arch/alpha/kernel/process.c
    @@ -125,7 +125,7 @@ common_shutdown_1(void *generic_ptr)
    /* Wait for the secondaries to halt. */
    set_cpu_present(boot_cpuid, false);
    set_cpu_possible(boot_cpuid, false);
    - while (cpumask_weight(cpu_present_mask))
    + while (!cpumask_empty(cpu_present_mask))
    barrier();
    #endif

    --
    2.30.2
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