diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6efcb2341599..91daa50256f8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -30,7 +30,7 @@ config ARM
 	select HARDIRQS_SW_RESEND
 	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
 	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
-	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
+	select HAVE_ARCH_JUMP_LABEL if (!XIP_KERNEL && !PREEMPT_RT_BASE)
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
 	select HAVE_ARCH_TRACEHOOK
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index e17a47eae339..98f923b6a0ea 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -55,8 +55,7 @@ extern bool static_key_initialized;
 				    "%s used before call to jump_label_init", \
 				    __func__)
 
-#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) && \
-	!defined(CONFIG_PREEMPT_BASE)
+#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
 
 struct static_key {
 	atomic_t enabled;
diff --git a/include/linux/rwsem_rt.h b/include/linux/rwsem_rt.h
index 924c2d274ab5..928a05cbf94f 100644
--- a/include/linux/rwsem_rt.h
+++ b/include/linux/rwsem_rt.h
@@ -59,6 +59,7 @@ extern void rt_down_write_nested_lock(struct rw_semaphore *rwsem,
 extern void  rt_down_read(struct rw_semaphore *rwsem);
 extern int  rt_down_write_trylock(struct rw_semaphore *rwsem);
 extern int  rt_down_read_trylock(struct rw_semaphore *rwsem);
+extern void  __rt_up_read(struct rw_semaphore *rwsem);
 extern void  rt_up_read(struct rw_semaphore *rwsem);
 extern void  rt_up_write(struct rw_semaphore *rwsem);
 extern void  rt_downgrade_write(struct rw_semaphore *rwsem);
@@ -92,6 +93,11 @@ static inline int down_write_trylock(struct rw_semaphore *sem)
 	return rt_down_write_trylock(sem);
 }
 
+static inline void __up_read(struct rw_semaphore *sem)
+{
+	__rt_up_read(sem);
+}
+
 static inline void up_read(struct rw_semaphore *sem)
 {
 	rt_up_read(sem);
diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c
index 2db0f42d5c64..652a8ee8efe9 100644
--- a/kernel/locking/percpu-rwsem.c
+++ b/kernel/locking/percpu-rwsem.c
@@ -84,12 +84,8 @@ void percpu_down_read(struct percpu_rw_semaphore *brw)
 
 	down_read(&brw->rw_sem);
 	atomic_inc(&brw->slow_read_ctr);
-#ifdef CONFIG_PREEMPT_RT_FULL
-	up_read(&brw->rw_sem);
-#else
 	/* avoid up_read()->rwsem_release() */
 	__up_read(&brw->rw_sem);
-#endif
 }
 
 void percpu_up_read(struct percpu_rw_semaphore *brw)
diff --git a/kernel/locking/rt.c b/kernel/locking/rt.c
index 73c55089fb93..3482ce87ab92 100644
--- a/kernel/locking/rt.c
+++ b/kernel/locking/rt.c
@@ -319,12 +319,18 @@ void  rt_up_write(struct rw_semaphore *rwsem)
 }
 EXPORT_SYMBOL(rt_up_write);
 
-void  rt_up_read(struct rw_semaphore *rwsem)
+
+void  __rt_up_read(struct rw_semaphore *rwsem)
 {
-	rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
 	if (--rwsem->read_depth == 0)
 		rt_mutex_unlock(&rwsem->lock);
 }
+
+void  rt_up_read(struct rw_semaphore *rwsem)
+{
+	rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
+	__rt_up_read(rwsem);
+}
 EXPORT_SYMBOL(rt_up_read);
 
 /*
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 292eea0cc412..4b15aa0de862 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1409,13 +1409,11 @@ unsigned long get_next_timer_interrupt(unsigned long now)
 
 #ifdef CONFIG_PREEMPT_RT_FULL
 	/*
-	 * On PREEMPT_RT we cannot sleep here. If the trylock does not
-	 * succeed then we return the worst-case 'expires in 1 tick'
-	 * value.  We use the rt functions here directly to avoid a
-	 * migrate_disable() call.
+	 * On PREEMPT_RT we cannot sleep here. As a result we can't take
+	 * the base lock to check when the next timer is pending and so
+	 * we assume the next jiffy.
 	 */
-	if (!spin_do_trylock(&base->lock))
-		return  now + 1;
+	return now + 1;
 #else
 	spin_lock(&base->lock);
 #endif
@@ -1424,11 +1422,7 @@ unsigned long get_next_timer_interrupt(unsigned long now)
 			base->next_timer = __next_timer_interrupt(base);
 		expires = base->next_timer;
 	}
-#ifdef CONFIG_PREEMPT_RT_FULL
-	rt_spin_unlock_after_trylock_in_irq(&base->lock);
-#else
 	spin_unlock(&base->lock);
-#endif
 
 	if (time_before_eq(expires, now))
 		return now;
diff --git a/localversion-rt b/localversion-rt
index 0efe7ba1930e..8fc605d80667 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt5
+-rt6
diff --git a/mm/slub.c b/mm/slub.c
index ea83736be12c..935ad58acde4 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1314,6 +1314,17 @@ static inline void slab_free_hook(struct kmem_cache *s, void *x)
 	kasan_slab_free(s, x);
 }
 
+static void setup_object(struct kmem_cache *s, struct page *page,
+				void *object)
+{
+	setup_object_debug(s, page, object);
+	if (unlikely(s->ctor)) {
+		kasan_unpoison_object_data(s, object);
+		s->ctor(object);
+		kasan_poison_object_data(s, object);
+	}
+}
+
 /*
  * Slab allocation and freeing
  */
@@ -1344,6 +1355,8 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
 	struct page *page;
 	struct kmem_cache_order_objects oo = s->oo;
 	gfp_t alloc_gfp;
+	void *start, *p;
+	int idx, order;
 	bool enableirqs;
 
 	flags &= gfp_allowed_mask;
@@ -1372,13 +1385,13 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
 		 * Try a lower order alloc if possible
 		 */
 		page = alloc_slab_page(s, alloc_gfp, node, oo);
-
-		if (page)
-			stat(s, ORDER_FALLBACK);
+		if (!unlikely(page))
+			goto out;
+		stat(s, ORDER_FALLBACK);
 	}
 
-	if (kmemcheck_enabled && page
-		&& !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
+	if (kmemcheck_enabled &&
+		!(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
 		int pages = 1 << oo_order(oo);
 
 		kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node);
@@ -1393,53 +1406,9 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
 			kmemcheck_mark_unallocated_pages(page, pages);
 	}
 
-	if (enableirqs)
-		local_irq_disable();
-	if (!page)
-		return NULL;
-
 	page->objects = oo_objects(oo);
-	mod_zone_page_state(page_zone(page),
-		(s->flags & SLAB_RECLAIM_ACCOUNT) ?
-		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
-		1 << oo_order(oo));
-
-	return page;
-}
-
-static void setup_object(struct kmem_cache *s, struct page *page,
-				void *object)
-{
-	setup_object_debug(s, page, object);
-#ifndef CONFIG_PREEMPT_RT_FULL
-	if (unlikely(s->ctor)) {
-		kasan_unpoison_object_data(s, object);
-		s->ctor(object);
-		kasan_poison_object_data(s, object);
-	}
-#endif
-}
-
-static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
-{
-	struct page *page;
-	void *start;
-	void *p;
-	int order;
-	int idx;
-
-	if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
-		pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
-		BUG();
-	}
-
-	page = allocate_slab(s,
-		flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
-	if (!page)
-		goto out;
 
 	order = compound_order(page);
-	inc_slabs_node(s, page_to_nid(page), page->objects);
 	page->slab_cache = s;
 	__SetPageSlab(page);
 	if (page->pfmemalloc)
@@ -1463,10 +1432,34 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
 	page->freelist = start;
 	page->inuse = page->objects;
 	page->frozen = 1;
+
 out:
+	if (enableirqs)
+		local_irq_disable();
+	if (!page)
+		return NULL;
+
+	mod_zone_page_state(page_zone(page),
+			    (s->flags & SLAB_RECLAIM_ACCOUNT) ?
+			    NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
+			    1 << oo_order(oo));
+
+	inc_slabs_node(s, page_to_nid(page), page->objects);
+
 	return page;
 }
 
+static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
+{
+	if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
+		pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
+		BUG();
+	}
+
+	return allocate_slab(s,
+		     flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
+}
+
 static void __free_slab(struct kmem_cache *s, struct page *page)
 {
 	int order = compound_order(page);
@@ -2562,13 +2555,6 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
 
 	if (unlikely(gfpflags & __GFP_ZERO) && object)
 		memset(object, 0, s->object_size);
-#ifdef CONFIG_PREEMPT_RT_FULL
-	if (unlikely(s->ctor) && object) {
-		kasan_unpoison_object_data(s, object);
-		s->ctor(object);
-		kasan_poison_object_data(s, object);
-	}
-#endif
 
 	slab_post_alloc_hook(s, gfpflags, object);