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authorEric W. Biederman <ebiederm@xmission.com>2006-04-18 22:20:16 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-19 09:13:49 -0700
commit5e85d4abe3f43bb5362f384bab0e20ef082ce0b5 (patch)
treecd3a29086e5274fd08bc8d22d15568deab144755 /fs/exec.c
parent181ae4005d0a4010802be534d929b38c42b9ac06 (diff)
downloadop-kernel-dev-5e85d4abe3f43bb5362f384bab0e20ef082ce0b5.zip
op-kernel-dev-5e85d4abe3f43bb5362f384bab0e20ef082ce0b5.tar.gz
[PATCH] task: Make task list manipulations RCU safe
While we can currently walk through thread groups, process groups, and sessions with just the rcu_read_lock, this opens the door to walking the entire task list. We already have all of the other RCU guarantees so there is no cost in doing this, this should be enough so that proc can stop taking the tasklist lock during readdir. prev_task was killed because it has no users, and using it will miss new tasks when doing an rcu traversal. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 4121bb5..3a79d97 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -712,7 +712,7 @@ static int de_thread(struct task_struct *tsk)
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(&current->tasks, &init_task.tasks);
+ list_add_tail_rcu(&current->tasks, &init_task.tasks);
current->group_leader = current;
leader->group_leader = current;
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