Hi Dawei,
On Sat, Apr 20, 2024 at 01:15:41PM +0800, Dawei Li wrote:
> In general it's preferable to avoid placing cpumasks on the stack, as
> for large values of NR_CPUS these can consume significant amounts of
> stack space and make stack overflows more likely.
>
> Use cpumask_any_but() to avoid the need for a temporary cpumask on
> the stack.
Another good argument for this patch is the simplification of the code.
>
> Signed-off-by: Dawei Li <dawei.li@xxxxxxxxxxxx>
> ---
> arch/sparc/mm/srmmu.c | 40 ++++++++++++----------------------------
> 1 file changed, 12 insertions(+), 28 deletions(-)
>
> diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
> index 852085ada368..86fd20c878ae 100644
> --- a/arch/sparc/mm/srmmu.c
> +++ b/arch/sparc/mm/srmmu.c
> @@ -1653,13 +1653,15 @@ static void smp_flush_tlb_all(void)
> local_ops->tlb_all();
> }
>
> +static bool cpumask_any_but_current(struct mm_struct *mm)
> +{
> + return cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids;
> +}
This helper is not a cpumask helper - the name should reflect what it is
used for.
Something like:
static bool any_other_mm_cpus(struct mm_struct *mm)
{
return cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids;
}
The implementation is fine - it is only the naming that should be
improve.
With this change (or a better name):
Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Sam
