Commit 24a7d0a6 authored Dec 22, 2017 by Lingutla Chandrasekhar

sched: core: Exclude isolated cpus in sched_getaffinity cpumask

User space tasks will have the same semantics for hotplug and isolation.
Currently the sched_getaffinity() include isolated CPU on which user
space tasks are forbidden to run. So fix this by excluding isolated cpus
while returning cpu mask for user space tasks in sched_getaffinity().

Change-Id: Ib6a8ca864754f73bbaf809c3ceaef5f91d567ca9
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>

parent 55cc722e

kernel/sched/core.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -4914,6 +4914,15 @@ long sched_getaffinity(pid_t pid, struct cpumask *mask)

		raw_spin_lock_irqsave(&p->pi_lock, flags);
		cpumask_and(mask, &p->cpus_allowed, cpu_active_mask);

		/*
		* The userspace tasks are forbidden to run on
		* isolated CPUs. So exclude isolated CPUs from
		* the getaffinity.
		*/
		if (!(p->flags & PF_KTHREAD))
		cpumask_andnot(mask, mask, cpu_isolated_mask);

		raw_spin_unlock_irqrestore(&p->pi_lock, flags);

		out_unlock: