sched: Switch the fallback task allowed cpumask to HK_TYPE_DOMAIN

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@kernel.org>
Acked-by: Waiman Long <longman@redhat.com>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org

diff --git a/include/linux/mmu_context.h b/include/linux/mmu_context.h
index ac01dc4eb2cecd71ed39bbb65df912b4734e9169..ed3dd0f3fe1946fecfefe4a37dbd865931ef6c6b 100644 (file)
--- 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