posix-cpu-timers: Prevent enqueueing when PF_EXITING is set

To prepare for cleaning up POSIX CPU timers in do_exit(), prevent
enqueueing POSIX CPU timers on a task which has PF_EXITING set.  Queueing a
timer on such a task is pointless because the task won't expire the timer
anymore.

The same applies to process wide timers when tsk::signal::flags has
SIGNAL_GROUP_EXIT set.

Pretending that the timer is armed allows to keep the POSIX timer mechanism
"working" so that the timer stays accessible up to the point where a task
is unhashed.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Kijo Park <red993688@gmail.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://patch.msgid.link/20260911090541.892445443@kernel.org

0 files changed, 0 insertions, 0 deletions