1 files changed, 0 insertions, 174 deletions
diff --git a/debian/patches-rt/futex-Delay-deallocation-of-pi_state.patch b/debian/patches-rt/futex-Delay-deallocation-of-pi_state.patch
deleted file mode 100644
index 507a015a3..000000000
--- a/debian/patches-rt/futex-Delay-deallocation-of-pi_state.patch
+++ /dev/null
@@ -1,174 +0,0 @@
-From: Thomas Gleixner <tglx@linutronix.de>
-Date: Wed, 26 Jun 2019 13:35:36 +0200
-Subject: [PATCH] futex: Delay deallocation of pi_state
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.2/older/patches-5.2.17-rt9.tar.xz
-
-On -RT we can't invoke kfree() in a non-preemptible context.
-
-Defer the deallocation of pi_state to preemptible context.
-
-Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- kernel/futex.c |   55 ++++++++++++++++++++++++++++++++++++++++++++-----------
- 1 file changed, 44 insertions(+), 11 deletions(-)
-
---- a/kernel/futex.c
-+++ b/kernel/futex.c
-@@ -814,13 +814,13 @@ static void get_pi_state(struct futex_pi
-  * Drops a reference to the pi_state object and frees or caches it
-  * when the last reference is gone.
-  */
--static void put_pi_state(struct futex_pi_state *pi_state)
-+static struct futex_pi_state *__put_pi_state(struct futex_pi_state *pi_state)
- {
- 	if (!pi_state)
--		return;
-+		return NULL;
- 
- 	if (!refcount_dec_and_test(&pi_state->refcount))
--		return;
-+		return NULL;
- 
- 	/*
- 	 * If pi_state->owner is NULL, the owner is most probably dying
-@@ -840,9 +840,7 @@ static void put_pi_state(struct futex_pi
- 		raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
- 	}
- 
--	if (current->pi_state_cache) {
--		kfree(pi_state);
--	} else {
-+	if (!current->pi_state_cache) {
- 		/*
- 		 * pi_state->list is already empty.
- 		 * clear pi_state->owner.
-@@ -851,6 +849,30 @@ static void put_pi_state(struct futex_pi
- 		pi_state->owner = NULL;
- 		refcount_set(&pi_state->refcount, 1);
- 		current->pi_state_cache = pi_state;
-+		pi_state = NULL;
-+	}
-+	return pi_state;
-+}
-+
-+static void put_pi_state(struct futex_pi_state *pi_state)
-+{
-+	kfree(__put_pi_state(pi_state));
-+}
-+
-+static void put_pi_state_atomic(struct futex_pi_state *pi_state,
-+				struct list_head *to_free)
-+{
-+	if (__put_pi_state(pi_state))
-+		list_add(&pi_state->list, to_free);
-+}
-+
-+static void free_pi_state_list(struct list_head *to_free)
-+{
-+	struct futex_pi_state *p, *next;
-+
-+	list_for_each_entry_safe(p, next, to_free, list) {
-+		list_del(&p->list);
-+		kfree(p);
- 	}
- }
- 
-@@ -867,6 +889,7 @@ void exit_pi_state_list(struct task_stru
- 	struct futex_pi_state *pi_state;
- 	struct futex_hash_bucket *hb;
- 	union futex_key key = FUTEX_KEY_INIT;
-+	LIST_HEAD(to_free);
- 
- 	if (!futex_cmpxchg_enabled)
- 		return;
-@@ -911,7 +934,7 @@ void exit_pi_state_list(struct task_stru
- 			/* retain curr->pi_lock for the loop invariant */
- 			raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
- 			raw_spin_unlock(&hb->lock);
--			put_pi_state(pi_state);
-+			put_pi_state_atomic(pi_state, &to_free);
- 			continue;
- 		}
- 
-@@ -930,6 +953,8 @@ void exit_pi_state_list(struct task_stru
- 		raw_spin_lock_irq(&curr->pi_lock);
- 	}
- 	raw_spin_unlock_irq(&curr->pi_lock);
-+
-+	free_pi_state_list(&to_free);
- }
- 
- #endif
-@@ -1910,6 +1935,7 @@ static int futex_requeue(u32 __user *uad
- 	struct futex_hash_bucket *hb1, *hb2;
- 	struct futex_q *this, *next;
- 	DEFINE_WAKE_Q(wake_q);
-+	LIST_HEAD(to_free);
- 
- 	if (nr_wake < 0 || nr_requeue < 0)
- 		return -EINVAL;
-@@ -2147,7 +2173,7 @@ static int futex_requeue(u32 __user *uad
- 				 * object.
- 				 */
- 				this->pi_state = NULL;
--				put_pi_state(pi_state);
-+				put_pi_state_atomic(pi_state, &to_free);
- 				/*
- 				 * We stop queueing more waiters and let user
- 				 * space deal with the mess.
-@@ -2164,7 +2190,7 @@ static int futex_requeue(u32 __user *uad
- 	 * in futex_proxy_trylock_atomic() or in lookup_pi_state(). We
- 	 * need to drop it here again.
- 	 */
--	put_pi_state(pi_state);
-+	put_pi_state_atomic(pi_state, &to_free);
- 
- out_unlock:
- 	double_unlock_hb(hb1, hb2);
-@@ -2185,6 +2211,7 @@ static int futex_requeue(u32 __user *uad
- out_put_key1:
- 	put_futex_key(&key1);
- out:
-+	free_pi_state_list(&to_free);
- 	return ret ? ret : task_count;
- }
- 
-@@ -2321,13 +2348,16 @@ static int unqueue_me(struct futex_q *q)
- static void unqueue_me_pi(struct futex_q *q)
- 	__releases(q->lock_ptr)
- {
-+	struct futex_pi_state *ps;
-+
- 	__unqueue_futex(q);
- 
- 	BUG_ON(!q->pi_state);
--	put_pi_state(q->pi_state);
-+	ps = __put_pi_state(q->pi_state);
- 	q->pi_state = NULL;
- 
- 	raw_spin_unlock(q->lock_ptr);
-+	kfree(ps);
- }
- 
- static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
-@@ -3279,6 +3309,8 @@ static int futex_wait_requeue_pi(u32 __u
- 		 * did a lock-steal - fix up the PI-state in that case.
- 		 */
- 		if (q.pi_state && (q.pi_state->owner != current)) {
-+			struct futex_pi_state *ps_free;
-+
- 			raw_spin_lock(q.lock_ptr);
- 			ret = fixup_pi_state_owner(uaddr2, &q, current);
- 			if (ret && rt_mutex_owner(&q.pi_state->pi_mutex) == current) {
-@@ -3289,8 +3321,9 @@ static int futex_wait_requeue_pi(u32 __u
- 			 * Drop the reference to the pi state which
- 			 * the requeue_pi() code acquired for us.
- 			 */
--			put_pi_state(q.pi_state);
-+			ps_free = __put_pi_state(q.pi_state);
- 			raw_spin_unlock(q.lock_ptr);
-+			kfree(ps_free);
- 		}
- 	} else {
- 		struct rt_mutex *pi_mutex;