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-rw-r--r--kernel/futex.c84
1 files changed, 11 insertions, 73 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index b9b8aea..9d260e8 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1120,9 +1120,10 @@ static int futex_wait(u32 __user *uaddr, u32 val, unsigned long time)
* if there are waiters then it will block, it does PI, etc. (Due to
* races the kernel might see a 0 value of the futex too.)
*/
-static int do_futex_lock_pi(u32 __user *uaddr, int detect, int trylock,
- struct hrtimer_sleeper *to)
+static int futex_lock_pi(u32 __user *uaddr, int detect, unsigned long sec,
+ long nsec, int trylock)
{
+ struct hrtimer_sleeper timeout, *to = NULL;
struct task_struct *curr = current;
struct futex_hash_bucket *hb;
u32 uval, newval, curval;
@@ -1132,6 +1133,13 @@ static int do_futex_lock_pi(u32 __user *uaddr, int detect, int trylock,
if (refill_pi_state_cache())
return -ENOMEM;
+ if (sec != MAX_SCHEDULE_TIMEOUT) {
+ to = &timeout;
+ hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_ABS);
+ hrtimer_init_sleeper(to, current);
+ to->timer.expires = ktime_set(sec, nsec);
+ }
+
q.pi_state = NULL;
retry:
down_read(&curr->mm->mmap_sem);
@@ -1307,7 +1315,7 @@ static int do_futex_lock_pi(u32 __user *uaddr, int detect, int trylock,
if (!detect && ret == -EDEADLK && 0)
force_sig(SIGKILL, current);
- return ret;
+ return ret != -EINTR ? ret : -ERESTARTNOINTR;
out_unlock_release_sem:
queue_unlock(&q, hb);
@@ -1342,76 +1350,6 @@ static int do_futex_lock_pi(u32 __user *uaddr, int detect, int trylock,
}
/*
- * Restart handler
- */
-static long futex_lock_pi_restart(struct restart_block *restart)
-{
- struct hrtimer_sleeper timeout, *to = NULL;
- int ret;
-
- restart->fn = do_no_restart_syscall;
-
- if (restart->arg2 || restart->arg3) {
- to = &timeout;
- hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_ABS);
- hrtimer_init_sleeper(to, current);
- to->timer.expires.tv64 = ((u64)restart->arg1 << 32) |
- (u64) restart->arg0;
- }
-
- pr_debug("lock_pi restart: %p, %d (%d)\n",
- (u32 __user *)restart->arg0, current->pid);
-
- ret = do_futex_lock_pi((u32 __user *)restart->arg0, restart->arg1,
- 0, to);
-
- if (ret != -EINTR)
- return ret;
-
- restart->fn = futex_lock_pi_restart;
-
- /* The other values are filled in */
- return -ERESTART_RESTARTBLOCK;
-}
-
-/*
- * Called from the syscall entry below.
- */
-static int futex_lock_pi(u32 __user *uaddr, int detect, unsigned long sec,
- long nsec, int trylock)
-{
- struct hrtimer_sleeper timeout, *to = NULL;
- struct restart_block *restart;
- int ret;
-
- if (sec != MAX_SCHEDULE_TIMEOUT) {
- to = &timeout;
- hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_ABS);
- hrtimer_init_sleeper(to, current);
- to->timer.expires = ktime_set(sec, nsec);
- }
-
- ret = do_futex_lock_pi(uaddr, detect, trylock, to);
-
- if (ret != -EINTR)
- return ret;
-
- pr_debug("lock_pi interrupted: %p, %d (%d)\n", uaddr, current->pid);
-
- restart = &current_thread_info()->restart_block;
- restart->fn = futex_lock_pi_restart;
- restart->arg0 = (unsigned long) uaddr;
- restart->arg1 = detect;
- if (to) {
- restart->arg2 = to->timer.expires.tv64 & 0xFFFFFFFF;
- restart->arg3 = to->timer.expires.tv64 >> 32;
- } else
- restart->arg2 = restart->arg3 = 0;
-
- return -ERESTART_RESTARTBLOCK;
-}
-
-/*
* Userspace attempted a TID -> 0 atomic transition, and failed.
* This is the in-kernel slowpath: we look up the PI state (if any),
* and do the rt-mutex unlock.
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