epoll: use RCU to protect wakeup_source in epitem

This prevents wakeup_source destruction when a user hits the item with
EPOLL_CTL_MOD while ep_poll_callback is running.

Tested with CONFIG_SPARSE_RCU_POINTER=y and "make fs/eventpoll.o C=2"

Signed-off-by: Eric Wong <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Arve Hjønnevåg <[email protected]>
Cc: Davide Libenzi <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions