The patch titled do_task_stat: don't take rcu_read_lock() has been removed from the -mm tree. Its filename was do_task_stat-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: do_task_stat: don't take rcu_read_lock() From: Oleg Nesterov <oleg@xxxxxxxxxx> lock_task_sighand() was changed, and do_task_stat() doesn't need rcu_read_lock any longer. sighand->siglock protects all "interesting" fields. Except: it doesn't protect ->tty->pgrp, but neither does rcu_read_lock(), this should be fixed. Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> Cc: Roland McGrath <roland@xxxxxxxxxx> Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> Cc: Pavel Emelyanov <xemul@xxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/proc/array.c | 2 -- 1 file changed, 2 deletions(-) diff -puN fs/proc/array.c~do_task_stat-dont-take-rcu_read_lock fs/proc/array.c --- a/fs/proc/array.c~do_task_stat-dont-take-rcu_read_lock +++ a/fs/proc/array.c @@ -425,7 +425,6 @@ static int do_task_stat(struct seq_file cutime = cstime = utime = stime = cputime_zero; cgtime = gtime = cputime_zero; - rcu_read_lock(); if (lock_task_sighand(task, &flags)) { struct signal_struct *sig = task->signal; @@ -469,7 +468,6 @@ static int do_task_stat(struct seq_file unlock_task_sighand(task, &flags); } - rcu_read_unlock(); if (!whole || num_threads < 2) wchan = get_wchan(task); _ 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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html