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authorEric W. Biederman <ebiederm@xmission.com>2006-06-26 00:25:51 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:25 -0700
commit454cc105ef690f2a0ba7c6b194d55666b4e918ce (patch)
treeb3e4fef90f42ddd16afc324fcff6371e44f63255
parent0bc58a910220be3446eedc8e77fd45c0a16d8f25 (diff)
downloadop-kernel-dev-454cc105ef690f2a0ba7c6b194d55666b4e918ce.zip
op-kernel-dev-454cc105ef690f2a0ba7c6b194d55666b4e918ce.tar.gz
[PATCH] proc: Remove tasklist_lock from proc_pid_readdir
We don't need the tasklist_lock to safely iterate through processes anymore. This depends on my previous to task patches that make get_task_struct rcu safe, and that make next_task() rcu safe. I haven't gotten first_tid/next_tid yet only because next_thread is missing an rcu_dereference. 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>
-rw-r--r--fs/proc/base.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 2236f7d..cc578a3 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2043,7 +2043,7 @@ out:
static struct task_struct *first_tgid(int tgid, int nr)
{
struct task_struct *pos = NULL;
- read_lock(&tasklist_lock);
+ rcu_read_lock();
if (tgid && nr) {
pos = find_task_by_pid(tgid);
if (pos && !thread_group_leader(pos))
@@ -2069,7 +2069,7 @@ static struct task_struct *first_tgid(int tgid, int nr)
}
pos = NULL;
done:
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
return pos;
}
@@ -2082,7 +2082,7 @@ done:
static struct task_struct *next_tgid(struct task_struct *start)
{
struct task_struct *pos;
- read_lock(&tasklist_lock);
+ rcu_read_lock();
pos = start;
if (pid_alive(start))
pos = next_task(start);
@@ -2092,7 +2092,7 @@ static struct task_struct *next_tgid(struct task_struct *start)
}
pos = NULL;
done:
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
put_task_struct(start);
return pos;
}
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