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| author | Oleg Nesterov <oleg@redhat.com> | 2024-02-05 18:43:47 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-02-06 14:02:51 +0100 |
| commit | e2e8a142fbd988d658ccb3da1d6f4b26a39de0fd (patch) | |
| tree | c1a86de427f271d587dab50b471309ab372ebca5 /kernel/exit.c | |
| parent | 9ed52108f6478a6a805c0c15a3f70aabba07247e (diff) | |
| download | linux-e2e8a142fbd988d658ccb3da1d6f4b26a39de0fd.tar.gz linux-e2e8a142fbd988d658ccb3da1d6f4b26a39de0fd.tar.bz2 linux-e2e8a142fbd988d658ccb3da1d6f4b26a39de0fd.zip | |
pidfd: exit: kill the no longer used thread_group_exited()
It was used by pidfd_poll() but now it has no callers.
If it finally finds a modular user we can revert this change, but note
that the comment above this helper and the changelog in 38fd525a4c61
("exit: Factor thread_group_exited out of pidfd_poll") are not accurate,
thread_group_exited() won't return true if all other threads have passed
exit_notify() and are zombies, it returns true only when all other threads
are completely gone. Not to mention that it can only work if the task
identified by @pid is a thread-group leader.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20240205174347.GA31461@redhat.com
Reviewed-by: Tycho Andersen <tandersen@netflix.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 24 |
1 files changed, 0 insertions, 24 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index c038d10dfb38..0e2f5dec91fb 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -1900,30 +1900,6 @@ Efault: } #endif -/** - * thread_group_exited - check that a thread group has exited - * @pid: tgid of thread group to be checked. - * - * Test if the thread group represented by tgid has exited (all - * threads are zombies, dead or completely gone). - * - * Return: true if the thread group has exited. false otherwise. - */ -bool thread_group_exited(struct pid *pid) -{ - struct task_struct *task; - bool exited; - - rcu_read_lock(); - task = pid_task(pid, PIDTYPE_PID); - exited = !task || - (READ_ONCE(task->exit_state) && thread_group_empty(task)); - rcu_read_unlock(); - - return exited; -} -EXPORT_SYMBOL(thread_group_exited); - /* * This needs to be __function_aligned as GCC implicitly makes any * implementation of abort() cold and drops alignment specified by |