From de7587343bfebc186995ad294e3de0da382eb9bc Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 26 Jun 2006 00:25:51 -0700 Subject: [PATCH] [PATCH] proc: Remove tasklist_lock from proc_pid_lookup() and proc_task_lookup() Since we no longer need the tasklist_lock for get_task_struct the lookup methods no longer need the tasklist_lock. This just depends on my previous patch that makes get_task_struct() rcu safe. Signed-off-by: Eric W. Biederman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/base.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index cc578a300a2b..8180579f8792 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1940,11 +1940,11 @@ struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct if (tgid == ~0U) goto out; - read_lock(&tasklist_lock); + rcu_read_lock(); task = find_task_by_pid(tgid); if (task) get_task_struct(task); - read_unlock(&tasklist_lock); + rcu_read_unlock(); if (!task) goto out; @@ -1988,11 +1988,11 @@ static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry if (tid == ~0U) goto out; - read_lock(&tasklist_lock); + rcu_read_lock(); task = find_task_by_pid(tid); if (task) get_task_struct(task); - read_unlock(&tasklist_lock); + rcu_read_unlock(); if (!task) goto out; if (leader->tgid != task->tgid) -- 2.20.1