[PATCH] signal, procfs: some lock_task_sighand() users do not need rcu_read_lock()

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index a28840b11b89b5ca0b544f44ce58182544f51eef..bb63fa1d34a2356e6b940a1f76f48605ec40ca48 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -164,7 +164,6 @@ static struct fs_struct *get_fs_struct(struct task_struct *task)
 
 static int get_nr_threads(struct task_struct *tsk)
 {
-       /* Must be called with the rcu_read_lock held */
        unsigned long flags;
        int count = 0;
 
@@ -471,14 +470,10 @@ static int proc_pid_limits(struct task_struct *task, char *buffer)
 
        struct rlimit rlim[RLIM_NLIMITS];
 
-       rcu_read_lock();
-       if (!lock_task_sighand(task,&flags)) {
-               rcu_read_unlock();
+       if (!lock_task_sighand(task, &flags))
                return 0;
-       }
        memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
        unlock_task_sighand(task, &flags);
-       rcu_read_unlock();
 
        /*
         * print the file header
@@ -3088,9 +3083,7 @@ static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct
        generic_fillattr(inode, stat);
 
        if (p) {
-               rcu_read_lock();
                stat->nlink += get_nr_threads(p);
-               rcu_read_unlock();
                put_task_struct(p);
        }