[PATCH 2/3] futex: Add missing annotation for wake_futex_pi()

[Jules Irenge]

Sparse reports a warning at wake_futex_pi()

|warning: context imbalance in wake_futex_pi() - unexpected unlock
To fix this,
a __releases(&pi_state->pi_mutex.wait_lock) annotation is added
Given that wake_futex_pi() does actually call
raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock)
This not only fixes the warning
but also improves on the readability of the code.

Signed-off-by: Jules Irenge <jbi.octave@xxxxxxxxx>
---
 kernel/futex.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/futex.c b/kernel/futex.c
index 03c518e9747e..8bc288a7187f 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1549,6 +1549,7 @@ static void mark_wake_futex(struct wake_q_head *wake_q, struct futex_q *q)
  * Caller must hold a reference on @pi_state.
  */
 static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_pi_state *pi_state)
+	__releases(&pi_state->pi_mutex.wait_lock)
 {
 	u32 uninitialized_var(curval), newval;
 	struct task_struct *new_owner;
-- 
2.24.1