Currently, if the affinity of a task changes when it is with migration disabled, the nr_cpus_allowed is not being updated, creating an inconsistency between nr_cpus_allowed and cpumask_weight(cpus_allowed)
This patch fixes this problem by calling set_cpus_allowed_common() if the cpumask of a task changes while it is with migration disable. Signed-off-by: Daniel Bristot de Oliveira <[email protected]> Cc: Luis Claudio R. Goncalves <[email protected]> Cc: Clark Williams <[email protected]> Cc: Luiz Capitulino <[email protected]> Cc: Sebastian Andrzej Siewior <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: LKML <[email protected]> Cc: linux-rt-users <[email protected]> --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index aeb3e12..0396bf2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1146,7 +1146,7 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) lockdep_assert_held(&p->pi_lock); if (__migrate_disabled(p)) { - cpumask_copy(&p->cpus_allowed, new_mask); + set_cpus_allowed_common(p, new_mask); return; } -- 2.9.4
