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exit: Implement kthread_exit

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[ Upstream commit bbda86e988d4c124e4cfa816291cbd583ae8bfb1 ]

The way the per task_struct exit_code is used by kernel threads is not
quite compatible how it is used by userspace applications.  The low
byte of the userspace exit_code value encodes the exit signal.  While
kthreads just use the value as an int holding ordinary kernel function
exit status like -EPERM.

Add kthread_exit to clearly separate the two kinds of uses.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Stable-dep-of: ca3574bd653a ("exit: Rename module_put_and_exit to module_put_and_kthread_exit")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric W. Biederman
2021-11-22 10:27:36 -06:00
committed by Greg Kroah-Hartman
parent 63b8c19231
commit 15606c8d52
3 changed files with 21 additions and 4 deletions
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include/linux/kthread.h
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@@ -68,6 +68,7 @@ void *kthread_probe_data(struct task_struct *k);
int kthread_park(struct task_struct *k);
void kthread_unpark(struct task_struct *k);
void kthread_parkme(void);
void kthread_exit(long result) __noreturn;
int kthreadd(void *unused);
extern struct task_struct *kthreadd_task;