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Eric W. Biederman authored
Create an independent helper thread_group_exited which returns true when all threads have passed exit_notify in do_exit. AKA all of the threads are at least zombies and might be dead or completely gone. Create this helper by taking the logic out of pidfd_poll where it is already tested, and adding a READ_ONCE on the read of task->exit_state. I will be changing the user mode driver code to use this same logic to know when a user mode driver needs to be restarted. Place the new helper thread_group_exited in kernel/exit.c and EXPORT it so it can be used by modules. Link: https://lkml.kernel.org/r/20200702164140.4468-13-ebiederm@xmission.comAcked-by:
Christian Brauner <christian.brauner@ubuntu.com> Acked-by:
Alexei Starovoitov <ast@kernel.org> Tested-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
"Eric W. Biederman" <ebiederm@xmission.com>
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