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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
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_MMU_CONTEXT_H
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#define _LINUX_MMU_CONTEXT_H
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#include <asm/mmu_context.h>
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#include <asm/mmu.h>
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/* Architectures that care about IRQ state in switch_mm can override this. */
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#ifndef switch_mm_irqs_off
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# define switch_mm_irqs_off switch_mm
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#endif
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#ifndef leave_mm
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static inline void leave_mm(void) { }
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#endif
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/*
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* CPUs that are capable of running user task @p. Must contain at least one
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* active CPU. It is assumed that the kernel can run on all CPUs, so calling
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* this for a kernel thread is pointless.
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*
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* By default, we assume a sane, homogeneous system.
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*/
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#ifndef task_cpu_possible_mask
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# define task_cpu_possible_mask(p) cpu_possible_mask
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# define task_cpu_possible(cpu, p) true
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# define task_cpu_fallback_mask(p) housekeeping_cpumask(HK_TYPE_DOMAIN)
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#else
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# define task_cpu_possible(cpu, p) cpumask_test_cpu((cpu), task_cpu_possible_mask(p))
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#endif
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#ifndef mm_untag_mask
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static inline unsigned long mm_untag_mask(struct mm_struct *mm)
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{
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return -1UL;
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}
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#endif
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#ifndef arch_pgtable_dma_compat
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static inline bool arch_pgtable_dma_compat(struct mm_struct *mm)
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{
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return true;
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}
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#endif
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#endif
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