iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

change thread_group_empty() to use task_struct->thread_node

Browse Source 
Patch series "kill task_struct->thread_group".


This patch (of 2):

It could use list_is_singular() but this way it is cheaper.  Plus the
thread_group_leader() check makes it clear that thread_group_empty() can
only return true if p is a group leader.  This was not immediately obvious
before this patch.

task_struct->thread_group no longer has users, it can die.

Link: https://lkml.kernel.org/r/20230826111200.GA22982@redhat.com
Link: https://lkml.kernel.org/r/20230826111406.GA23238@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2023-08-26 13:14:06 +02:00 committed by Andrew Morton
parent d639cf4abb
commit e34a35ee1f
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/sched/signal.h
View File

@ -733,7 +733,8 @@ static inline struct task_struct *next_thread(struct task_struct *p)
static inline int thread_group_empty(struct task_struct *p)
{
return list_empty(&p->thread_group);
return thread_group_leader(p) &&
list_is_last(&p->thread_node, &p->signal->thread_head);
}
#define delay_group_leader(p) \