Update wake_futex_pi() and kill the call altogether. This is possible because:
(i) The case of fixup_owner() in which the pi_mutex was stolen from the
signaled enqueued top-waiter which fails to trylock and doesn't see a
current owner of the rtmutex but needs to acknowledge an non-enqueued
higher priority waiter, which is the other alternative. This used to be
handled by rt_mutex_next_owner(), which guaranteed
fixup_pi_state_owner('newowner')
never to be nil. Nowadays the logic is handled by an EAGAIN loop, without
the need of rt_mutex_next_owner(). Specifically:
c1e2f0eaf015 (futex: Avoid violating the 10th rule of futex)
9f5d1c336a10 (futex: Handle transient "ownerless" rtmutex state correctly)
(ii) rt_mutex_next_owner() and rt_mutex_top_waiter() are semantically
equivalent, as of:
c28d62cf52d7 (locking/rtmutex: Handle non enqueued waiters gracefully in
remove_waiter())
So instead of keeping the call around, just use the good ole
rt_mutex_top_waiter().
This patch implies no change in semantics.
Signed-off-by: Davidlohr Bueso <dbu...@suse.de>
---
kernel/futex.c | 7 +++++--
kernel/locking/rtmutex.c | 20 --------------------
kernel/locking/rtmutex_common.h | 1 -
3 files changed, 5 insertions(+), 23 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c
index e68db7745039..db8002dbca7a 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1494,13 +1494,14 @@ static void mark_wake_futex(struct wake_q_head *wake_q,
struct futex_q *q)
static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_pi_state
*pi_state)
{
u32 curval, newval;
+ struct rt_mutex_waiter *top_waiter;
struct task_struct *new_owner;
bool postunlock = false;
DEFINE_WAKE_Q(wake_q);
int ret = 0;
- new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
- if (WARN_ON_ONCE(!new_owner)) {
+ top_waiter = rt_mutex_top_waiter(&pi_state->pi_mutex);
+ if (WARN_ON_ONCE(!top_waiter)) {
/*
* As per the comment in futex_unlock_pi() this should not
happen.
*
@@ -1513,6 +1514,8 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval,
struct futex_pi_state *pi_
goto out_unlock;
}
+ new_owner = top_waiter->task;
+
/*
* We pass it to the next owner. The WAITERS bit is always kept
* enabled while there is PI state around. We cleanup the owner
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 03b21135313c..919391c604f1 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1792,26 +1792,6 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
return ret;
}
-/**
- * rt_mutex_next_owner - return the next owner of the lock
- *
- * @lock: the rt lock query
- *
- * Returns the next owner of the lock or NULL
- *
- * Caller has to serialize against other accessors to the lock
- * itself.
- *
- * Special API call for PI-futex support
- */
-struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock)
-{
- if (!rt_mutex_has_waiters(lock))
- return NULL;
-
- return rt_mutex_top_waiter(lock)->task;
-}
-
/**
* rt_mutex_wait_proxy_lock() - Wait for lock acquisition
* @lock: the rt_mutex we were woken on
diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
index ca6fb489007b..a5007f00c1b7 100644
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -130,7 +130,6 @@ enum rtmutex_chainwalk {
/*
* PI-futex support (proxy locking functions, etc.):
*/
-extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock);
extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
struct task_struct *proxy_owner);
extern void rt_mutex_proxy_unlock(struct rt_mutex *lock);
--
2.26.2
