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exit/kthread: Move the exit code for kernel threads into struct kthread

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The exit code of kernel threads has different semantics than the
exit_code of userspace tasks.  To avoid confusion and allow
the userspace implementation to change as needed move
the kernel thread exit code into struct kthread.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2021-12-03 11:42:49 -06:00
parent 40966e316f
commit 6b1248798e
1 changed files with 5 additions and 2 deletions
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7
kernel/kthread.c
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@ -52,6 +52,7 @@ struct kthread_create_info
struct kthread {
unsigned long flags;
unsigned int cpu;
int result;
int (*threadfn)(void *);
void *data;
mm_segment_t oldfs;
@ -287,7 +288,9 @@ EXPORT_SYMBOL_GPL(kthread_parkme);
*/
void __noreturn kthread_exit(long result)
{
do_exit(result);
struct kthread *kthread = to_kthread(current);
kthread->result = result;
do_exit(0);
}
/**
@ -679,7 +682,7 @@ int kthread_stop(struct task_struct *k)
kthread_unpark(k);
wake_up_process(k);
wait_for_completion(&kthread->exited);
ret = k->exit_code;
ret = kthread->result;
put_task_struct(k);
trace_sched_kthread_stop_ret(ret);