+ de_thread-fix-lockless-do_each_thread.patch added to -mm tree

[akpm@xxxxxxxx]

The patch titled

     de_thread: fix lockless do_each_thread

has been added to the -mm tree.  Its filename is

     de_thread-fix-lockless-do_each_thread.patch

See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this


From: Oleg Nesterov <oleg@xxxxxxxxxx>

We should keep the value of old_leader->tasks.next in de_thread, otherwise
we can't do for_each_process/do_each_thread without tasklist_lock held.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---

 fs/exec.c |    3 +--
 1 files changed, 1 insertion(+), 2 deletions(-)

diff -puN fs/exec.c~de_thread-fix-lockless-do_each_thread fs/exec.c
--- devel/fs/exec.c~de_thread-fix-lockless-do_each_thread	2006-05-14 08:11:05.000000000 -0700
+++ devel-akpm/fs/exec.c	2006-05-14 08:11:05.000000000 -0700
@@ -706,7 +706,7 @@ static int de_thread(struct task_struct 
 		attach_pid(current, PIDTYPE_PID,  current->pid);
 		attach_pid(current, PIDTYPE_PGID, current->signal->pgrp);
 		attach_pid(current, PIDTYPE_SID,  current->signal->session);
-		list_add_tail_rcu(&current->tasks, &init_task.tasks);
+		list_replace_rcu(&leader->tasks, &current->tasks);
 
 		current->group_leader = current;
 		leader->group_leader = current;
@@ -714,7 +714,6 @@ static int de_thread(struct task_struct 
 		/* Reduce leader to a thread */
 		detach_pid(leader, PIDTYPE_PGID);
 		detach_pid(leader, PIDTYPE_SID);
-		list_del_init(&leader->tasks);
 
 		current->exit_signal = SIGCHLD;
 
_

Patches currently in -mm which might be from oleg@xxxxxxxxxx are

avoid-tasklist_lock-at-getrusage-for-multithreaded-case-too.patch
ptrace-document-the-locking-rules.patch
when-config_base_samll=1-the-kernel-261611-cascade-in-kernel-timerc-may-enter-the-infinite-loop.patch
proc-remove-tasklist_lock-from-proc_pid_readdir-simply-fix-first_tgid.patch
proc-dont-lock-task_structs-indefinitely.patch
proc-dont-lock-task_structs-indefinitely-task_mmu-small-fixes.patch
simplify-fix-first_tid.patch
cleanup-next_tid.patch
coredump-optimize-mm-users-traversal.patch
coredump-speedup-sigkill-sending.patch
coredump-kill-ptrace-related-stuff.patch
coredump-kill-ptrace-related-stuff-fix.patch
coredump-dont-take-tasklist_lock.patch
coredump-some-code-relocations.patch
coredump-shutdown-current-process-first.patch
coredump-copy_process-dont-check-signal_group_exit.patch
de_thread-fix-lockless-do_each_thread.patch
pidhash-temporary-debug-checks.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