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    Subject[PATCH RT 2/6] kernel: migrate_disable() do fastpath in atomic & irqs-off
    Date
    With interrupts off it makes no sense to do the long path since we can't
    leave the CPU anyway. Also we might end up in a recursion with lockdep.

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    ---
    kernel/sched/core.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/kernel/sched/core.c b/kernel/sched/core.c
    index 1217926b500d..40c1e29416c0 100644
    --- a/kernel/sched/core.c
    +++ b/kernel/sched/core.c
    @@ -3157,7 +3157,7 @@ void migrate_disable(void)
    {
    struct task_struct *p = current;

    - if (in_atomic()) {
    + if (in_atomic() || irqs_disabled()) {
    #ifdef CONFIG_SCHED_DEBUG
    p->migrate_disable_atomic++;
    #endif
    @@ -3188,7 +3188,7 @@ void migrate_enable(void)
    {
    struct task_struct *p = current;

    - if (in_atomic()) {
    + if (in_atomic() || irqs_disabled()) {
    #ifdef CONFIG_SCHED_DEBUG
    p->migrate_disable_atomic--;
    #endif
    --
    2.7.0
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