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signal: Rename group_exit_task group_exec_task

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The only remaining user of group_exit_task is exec.  Rename the field
so that it is clear which part of the code uses it.

Update the comment above the definition of group_exec_task to document
how it is currently used.

Link: https://lkml.kernel.org/r/20211213225350.27481-7-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2021-06-06 13:47:53 -05:00
parent 6ac79ec537
commit 60700e38fb
3 changed files with 10 additions and 14 deletions
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8
fs/exec.c
View File

@ -1054,7 +1054,7 @@ static int de_thread(struct task_struct *tsk)
return -EAGAIN;
}
sig->group_exit_task = tsk;
sig->group_exec_task = tsk;
sig->notify_count = zap_other_threads(tsk);
if (!thread_group_leader(tsk))
sig->notify_count--;
@ -1082,7 +1082,7 @@ static int de_thread(struct task_struct *tsk)
write_lock_irq(&tasklist_lock);
/*
* Do this under tasklist_lock to ensure that
* exit_notify() can't miss ->group_exit_task
* exit_notify() can't miss ->group_exec_task
*/
sig->notify_count = -1;
if (likely(leader->exit_state))
@ -1149,7 +1149,7 @@ static int de_thread(struct task_struct *tsk)
release_task(leader);
}
sig->group_exit_task = NULL;
sig->group_exec_task = NULL;
sig->notify_count = 0;
no_thread_group:
@ -1162,7 +1162,7 @@ no_thread_group:
killed:
/* protects against exit_notify() and __exit_signal() */
read_lock(&tasklist_lock);
sig->group_exit_task = NULL;
sig->group_exec_task = NULL;
sig->notify_count = 0;
read_unlock(&tasklist_lock);
return -EAGAIN;

12
include/linux/sched/signal.h
View File

@ -109,13 +109,9 @@ struct signal_struct {
/* thread group exit support */
int group_exit_code;
/* overloaded:
* - notify group_exit_task when ->count is equal to notify_count
* - everyone except group_exit_task is stopped during signal delivery
* of fatal signals, group_exit_task processes the signal.
*/
/* notify group_exec_task when notify_count is less or equal to 0 */
int notify_count;
struct task_struct *group_exit_task;
struct task_struct *group_exec_task;
/* thread group stop support, overloads group_exit_code too */
int group_stop_count;
@ -275,11 +271,11 @@ static inline void signal_set_stop_flags(struct signal_struct *sig,
sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;
}
/* If true, all threads except ->group_exit_task have pending SIGKILL */
/* If true, all threads except ->group_exec_task have pending SIGKILL */
static inline int signal_group_exit(const struct signal_struct *sig)
{
return (sig->flags & SIGNAL_GROUP_EXIT) ||
(sig->group_exit_task != NULL);
(sig->group_exec_task != NULL);
}
extern void flush_signals(struct task_struct *);

4
kernel/exit.c
View File

@ -116,7 +116,7 @@ static void __exit_signal(struct task_struct *tsk)
* then notify it:
*/
if (sig->notify_count > 0 && !--sig->notify_count)
wake_up_process(sig->group_exit_task);
wake_up_process(sig->group_exec_task);
if (tsk == sig->curr_target)
sig->curr_target = next_thread(tsk);
@ -697,7 +697,7 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
/* mt-exec, de_thread() is waiting for group leader */
if (unlikely(tsk->signal->notify_count < 0))
wake_up_process(tsk->signal->group_exit_task);
wake_up_process(tsk->signal->group_exec_task);
write_unlock_irq(&tasklist_lock);
list_for_each_entry_safe(p, n, &dead, ptrace_entry) {