sched: Use lockdep-based checking on rcu_dereference()

[deliverable/linux.git] / kernel / sys.c

diff --git a/kernel/sys.c b/kernel/sys.c
index 20ccfb5da6af1bfe9d1eb784b601397a932dff66..18bde979f346c46a8af621b62171912a1db98f5a 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -162,6 +162,7 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
        if (niceval > 19)
                niceval = 19;
 
+       rcu_read_lock();
        read_lock(&tasklist_lock);
        switch (which) {
                case PRIO_PROCESS:
@@ -199,6 +200,7 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
        }
 out_unlock:
        read_unlock(&tasklist_lock);
+       rcu_read_unlock();
 out:
        return error;
 }
@@ -220,6 +222,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who)
        if (which > PRIO_USER || which < PRIO_PROCESS)
                return -EINVAL;
 
+       rcu_read_lock();
        read_lock(&tasklist_lock);
        switch (which) {
                case PRIO_PROCESS:
@@ -265,6 +268,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who)
        }
 out_unlock:
        read_unlock(&tasklist_lock);
+       rcu_read_unlock();
 
        return retval;
 }