The patch titled
sys_setpgid: eliminate unnecessary do_each_task_pid(PIDTYPE_PGID)
has been removed from the -mm tree. Its filename was
sys_setpgid-eliminate-unnecessary-do_each_task_pidpidtype_pgid.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sys_setpgid: eliminate unnecessary do_each_task_pid(PIDTYPE_PGID)
From: Oleg Nesterov <oleg@xxxxxxxxxx>
All tasks in the process group have the same sid, we don't need to iterate
them all to check that the caller of sys_setpgid() doesn't change its
session.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/sys.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff -puN kernel/sys.c~sys_setpgid-eliminate-unnecessary-do_each_task_pidpidtype_pgid kernel/sys.c
--- a/kernel/sys.c~sys_setpgid-eliminate-unnecessary-do_each_task_pidpidtype_pgid
+++ a/kernel/sys.c
@@ -1397,16 +1397,13 @@ asmlinkage long sys_setpgid(pid_t pid, p
goto out;
if (pgid != pid) {
- struct task_struct *p;
+ struct task_struct *g =
+ find_task_by_pid_type(PIDTYPE_PGID, pgid);
- do_each_task_pid(pgid, PIDTYPE_PGID, p) {
- if (process_session(p) == process_session(group_leader))
- goto ok_pgid;
- } while_each_task_pid(pgid, PIDTYPE_PGID, p);
- goto out;
+ if (!g || process_session(g) != process_session(group_leader))
+ goto out;
}
-ok_pgid:
err = security_task_setpgid(p, pgid);
if (err)
goto out;
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
sys_setpgid-eliminate-unnecessary-do_each_task_pidpidtype_pgid.patch
session_of_pgrp-kill-unnecessary-do_each_task_pidpidtype_pgid.patch
doc-atomic_add_unless-doesnt-imply-mb-on-failure.patch
pidhash-temporary-debug-checks.patch
-
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