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sched: core: Exclude isolated cpus in sched_getaffinity cpumask

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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>
This commit is contained in:
Lingutla Chandrasekhar 2017-12-22 17:22:25 +05:30
parent 55cc722ec6
commit 24a7d0a621
1 changed files with 9 additions and 0 deletions
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9
kernel/sched/core.c
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@ -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: