[PATCH 4.4 01/11] futex: Rename free_pi_state() to put_pi_state()

Zhen Lei
2021-08-02T13:50:23Z

From: Thomas Gleixner <tglx@linutronix.de>

[ Upstream commit 29e9ee5d48c35d6cf8afe09bdf03f77125c9ac11 ]

free_pi_state() is confusing as it is in fact only freeing/caching the
pi state when the last reference is gone. Rename it to put_pi_state()
which reflects better what it is doing.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Darren Hart <darren@dvhart.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Bhuvanesh_Surachari@mentor.com
Cc: Andy Lowe <Andy_Lowe@mentor.com>
Link: http://lkml.kernel.org/r/20151219200607.259636467@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
kernel/futex.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index ff5499b0c5b34f7..dbb38e14f6fcc8e 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -859,9 +859,12 @@ static void pi_state_update_owner(struct futex_pi_state *pi_state,
}

/*
+ * Drops a reference to the pi_state object and frees or caches it
+ * when the last reference is gone.
+ *
* Must be called with the hb lock held.
*/
-static void free_pi_state(struct futex_pi_state *pi_state)
+static void put_pi_state(struct futex_pi_state *pi_state)
{
if (!pi_state)
return;
@@ -2121,7 +2124,7 @@ retry_private:
case 0:
break;
case -EFAULT:
- free_pi_state(pi_state);
+ put_pi_state(pi_state);
pi_state = NULL;
double_unlock_hb(hb1, hb2);
hb_waiters_dec(hb2);
@@ -2139,7 +2142,7 @@ retry_private:
* exit to complete.
* - EAGAIN: The user space value changed.
*/
- free_pi_state(pi_state);
+ put_pi_state(pi_state);
pi_state = NULL;
double_unlock_hb(hb1, hb2);
hb_waiters_dec(hb2);
@@ -2214,7 +2217,7 @@ retry_private:
} else if (ret) {
/* -EDEADLK */
this->pi_state = NULL;
- free_pi_state(pi_state);
+ put_pi_state(pi_state);
goto out_unlock;
}
}
@@ -2223,7 +2226,7 @@ retry_private:
}

out_unlock:
- free_pi_state(pi_state);
+ put_pi_state(pi_state);
double_unlock_hb(hb1, hb2);
wake_up_q(&wake_q);
hb_waiters_dec(hb2);
@@ -2376,7 +2379,7 @@ static void unqueue_me_pi(struct futex_q *q)
__unqueue_futex(q);

BUG_ON(!q->pi_state);
- free_pi_state(q->pi_state);
+ put_pi_state(q->pi_state);
q->pi_state = NULL;

spin_unlock(q->lock_ptr);
@@ -3210,7 +3213,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
* Drop the reference to the pi state which
* the requeue_pi() code acquired for us.
*/
- free_pi_state(q.pi_state);
+ put_pi_state(q.pi_state);
spin_unlock(q.lock_ptr);
/*
* Adjust the return value. It's either -EFAULT or
--
2.26.0.106.g9fadedd