The patch titled
k_getrusage: don't take rcu_read_lock()
has been removed from the -mm tree. Its filename was
k_getrusage-dont-take-rcu_read_lock.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: k_getrusage: don't take rcu_read_lock()
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Just a trivial example, more to come.
k_getrusage() holds rcu_read_lock() because it was previously required by
lock_task_sighand(). Unneeded now.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff -puN kernel/sys.c~k_getrusage-dont-take-rcu_read_lock kernel/sys.c
--- a/kernel/sys.c~k_getrusage-dont-take-rcu_read_lock
+++ a/kernel/sys.c
@@ -1572,11 +1572,8 @@ static void k_getrusage(struct task_stru
goto out;
}
- rcu_read_lock();
- if (!lock_task_sighand(p, &flags)) {
- rcu_read_unlock();
+ if (!lock_task_sighand(p, &flags))
return;
- }
switch (who) {
case RUSAGE_BOTH:
@@ -1612,9 +1609,7 @@ static void k_getrusage(struct task_stru
default:
BUG();
}
-
unlock_task_sighand(p, &flags);
- rcu_read_unlock();
out:
cputime_to_timeval(utime, &r->ru_utime);
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
posix-timers-bug-10460-discard-the-pending-signal-when-the-timer-is-destroyed.patch
workqueue-remove-redundant-function-invocation.patch
put_pid-make-sure-we-dont-free-the-live-pid.patch
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