[PATCH 28/33] sched: Switch the fallback task allowed cpumask to HK_TYPE_DOMAIN

[Waiman Long]

On 12/24/25 8:45 AM, Frederic Weisbecker wrote:
> Tasks that have all their allowed CPUs offline don't want their affinity
> to fallback on either nohz_full CPUs or on domain isolated CPUs. And
> since nohz_full implies domain isolation, checking the latter is enough
> to verify both.
>
> Therefore exclude domain isolation from fallback task affinity.
>
> Signed-off-by: Frederic Weisbecker <frederic at kernel.org>
> ---
>   include/linux/mmu_context.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/mmu_context.h b/include/linux/mmu_context.h
> index ac01dc4eb2ce..ed3dd0f3fe19 100644
> --- a/include/linux/mmu_context.h
> +++ b/include/linux/mmu_context.h
> @@ -24,7 +24,7 @@ static inline void leave_mm(void) { }
>   #ifndef task_cpu_possible_mask
>   # define task_cpu_possible_mask(p)	cpu_possible_mask
>   # define task_cpu_possible(cpu, p)	true
> -# define task_cpu_fallback_mask(p)	housekeeping_cpumask(HK_TYPE_TICK)
> +# define task_cpu_fallback_mask(p)	housekeeping_cpumask(HK_TYPE_DOMAIN)
>   #else
>   # define task_cpu_possible(cpu, p)	cpumask_test_cpu((cpu), task_cpu_possible_mask(p))
>   #endif
Acked-by: Waiman Long <longman at redhat.com>