sched: Sched_rt_periodic_timer vs cpu hotplug

Heiko reported a case where a timer interrupt managed to
reference a root_domain structure that was already freed by a
concurrent hot-un-plug operation.

Solve this like the regular sched_domain stuff is also
synchronized, by adding a synchronize_sched() stmt to the free
path, this ensures that a root_domain stays present for any
atomic section that could have observed it.

Reported-by: Heiko Carstens <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Acked-by: Heiko Carstens <[email protected]>
Cc: Gregory Haskins <[email protected]>
Cc: Siddha Suresh B <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
LKML-Reference: <1258363873.26714.83.camel@laptop>
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions