1 files changed, 0 insertions, 61 deletions
diff --git a/debian/patches-rt/futex-workaround-migrate_disable-enable-in-different.patch b/debian/patches-rt/futex-workaround-migrate_disable-enable-in-different.patch
deleted file mode 100644
index c9f5d342b..000000000
--- a/debian/patches-rt/futex-workaround-migrate_disable-enable-in-different.patch
+++ /dev/null
@@ -1,61 +0,0 @@
-From: Thomas Gleixner <tglx@linutronix.de>
-Date: Wed, 8 Mar 2017 14:23:35 +0100
-Subject: [PATCH] futex: workaround migrate_disable/enable in different context
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.0/older/patches-5.0.10-rt7.tar.xz
-
-migrate_disable()/migrate_enable() takes a different path in atomic() vs
-!atomic() context. These little hacks ensure that we don't underflow / overflow
-the migrate code counts properly while we lock the hb lockwith interrupts
-enabled and unlock it with interrupts disabled.
-
-Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- kernel/futex.c |   18 ++++++++++++++++++
- 1 file changed, 18 insertions(+)
-
---- a/kernel/futex.c
-+++ b/kernel/futex.c
-@@ -2867,6 +2867,14 @@ static int futex_lock_pi(u32 __user *uad
- 	 * before __rt_mutex_start_proxy_lock() is done.
- 	 */
- 	raw_spin_lock_irq(&q.pi_state->pi_mutex.wait_lock);
-+	/*
-+	 * the migrate_disable() here disables migration in the in_atomic() fast
-+	 * path which is enabled again in the following spin_unlock(). We have
-+	 * one migrate_disable() pending in the slow-path which is reversed
-+	 * after the raw_spin_unlock_irq() where we leave the atomic context.
-+	 */
-+	migrate_disable();
-+
- 	spin_unlock(q.lock_ptr);
- 	/*
- 	 * __rt_mutex_start_proxy_lock() unconditionally enqueues the @rt_waiter
-@@ -2875,6 +2883,7 @@ static int futex_lock_pi(u32 __user *uad
- 	 */
- 	ret = __rt_mutex_start_proxy_lock(&q.pi_state->pi_mutex, &rt_waiter, current);
- 	raw_spin_unlock_irq(&q.pi_state->pi_mutex.wait_lock);
-+	migrate_enable();
- 
- 	if (ret) {
- 		if (ret == 1)
-@@ -3023,10 +3032,19 @@ static int futex_unlock_pi(u32 __user *u
- 		 * rt_waiter. Also see the WARN in wake_futex_pi().
- 		 */
- 		raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock);
-+		/*
-+		 * Magic trickery for now to make the RT migrate disable
-+		 * logic happy. The following spin_unlock() happens with
-+		 * interrupts disabled so the internal migrate_enable()
-+		 * won't undo the migrate_disable() which was issued when
-+		 * locking hb->lock.
-+		 */
-+		migrate_disable();
- 		spin_unlock(&hb->lock);
- 
- 		/* drops pi_state->pi_mutex.wait_lock */
- 		ret = wake_futex_pi(uaddr, uval, pi_state);
-+		migrate_enable();
- 
- 		put_pi_state(pi_state);
-