Adding debian version 4.19.249-2.debian/4.19.249-2debian

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 351 insertions, 0 deletions

diff --git a/debian/patches-rt/0158-rcu-Merge-RCU-bh-into-RCU-preempt.patch b/debian/patches-rt/0158-rcu-Merge-RCU-bh-into-RCU-preempt.patch
new file mode 100644
index 000000000..1c3897d25
--- /dev/null
+++ b/debian/patches-rt/0158-rcu-Merge-RCU-bh-into-RCU-preempt.patch
@@ -0,0 +1,351 @@
+From d21751c3efb035a08326d8a28789b91cb769ea70 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Wed, 5 Oct 2011 11:59:38 -0700
+Subject: [PATCH 158/347] rcu: Merge RCU-bh into RCU-preempt
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+The Linux kernel has long RCU-bh read-side critical sections that
+intolerably increase scheduling latency under mainline's RCU-bh rules,
+which include RCU-bh read-side critical sections being non-preemptible.
+This patch therefore arranges for RCU-bh to be implemented in terms of
+RCU-preempt for CONFIG_PREEMPT_RT_FULL=y.
+
+This has the downside of defeating the purpose of RCU-bh, namely,
+handling the case where the system is subjected to a network-based
+denial-of-service attack that keeps at least one CPU doing full-time
+softirq processing.  This issue will be fixed by a later commit.
+
+The current commit will need some work to make it appropriate for
+mainline use, for example, it needs to be extended to cover Tiny RCU.
+
+[ paulmck: Added a useful changelog ]
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
+Link: http://lkml.kernel.org/r/20111005185938.GA20403@linux.vnet.ibm.com
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ include/linux/rcupdate.h | 19 +++++++++++++++++++
+ include/linux/rcutree.h  |  8 ++++++++
+ kernel/rcu/rcu.h         | 11 +++++++++--
+ kernel/rcu/rcutorture.c  |  7 +++++++
+ kernel/rcu/tree.c        | 26 ++++++++++++++++++++++++++
+ kernel/rcu/tree.h        |  2 ++
+ kernel/rcu/update.c      |  2 ++
+ 7 files changed, 73 insertions(+), 2 deletions(-)
+
+diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
+index e6733d7911e9..08d64e5713fc 100644
+--- a/include/linux/rcupdate.h
++++ b/include/linux/rcupdate.h
+@@ -56,7 +56,11 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func);
+ #define	call_rcu	call_rcu_sched
+ #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
+ 
++#ifdef CONFIG_PREEMPT_RT_FULL
++#define call_rcu_bh	call_rcu
++#else
+ void call_rcu_bh(struct rcu_head *head, rcu_callback_t func);
++#endif
+ void call_rcu_sched(struct rcu_head *head, rcu_callback_t func);
+ void synchronize_sched(void);
+ void rcu_barrier_tasks(void);
+@@ -261,7 +265,14 @@ extern struct lockdep_map rcu_sched_lock_map;
+ extern struct lockdep_map rcu_callback_map;
+ int debug_lockdep_rcu_enabled(void);
+ int rcu_read_lock_held(void);
++#ifdef CONFIG_PREEMPT_RT_FULL
++static inline int rcu_read_lock_bh_held(void)
++{
++	return rcu_read_lock_held();
++}
++#else
+ int rcu_read_lock_bh_held(void);
++#endif
+ int rcu_read_lock_sched_held(void);
+ 
+ #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
+@@ -661,10 +672,14 @@ static inline void rcu_read_unlock(void)
+ static inline void rcu_read_lock_bh(void)
+ {
+ 	local_bh_disable();
++#ifdef CONFIG_PREEMPT_RT_FULL
++	rcu_read_lock();
++#else
+ 	__acquire(RCU_BH);
+ 	rcu_lock_acquire(&rcu_bh_lock_map);
+ 	RCU_LOCKDEP_WARN(!rcu_is_watching(),
+ 			 "rcu_read_lock_bh() used illegally while idle");
++#endif
+ }
+ 
+ /*
+@@ -674,10 +689,14 @@ static inline void rcu_read_lock_bh(void)
+  */
+ static inline void rcu_read_unlock_bh(void)
+ {
++#ifdef CONFIG_PREEMPT_RT_FULL
++	rcu_read_unlock();
++#else
+ 	RCU_LOCKDEP_WARN(!rcu_is_watching(),
+ 			 "rcu_read_unlock_bh() used illegally while idle");
+ 	rcu_lock_release(&rcu_bh_lock_map);
+ 	__release(RCU_BH);
++#endif
+ 	local_bh_enable();
+ }
+ 
+diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
+index 914655848ef6..462ce061bac7 100644
+--- a/include/linux/rcutree.h
++++ b/include/linux/rcutree.h
+@@ -44,7 +44,11 @@ static inline void rcu_virt_note_context_switch(int cpu)
+ 	rcu_note_context_switch(false);
+ }
+ 
++#ifdef CONFIG_PREEMPT_RT_FULL
++# define synchronize_rcu_bh	synchronize_rcu
++#else
+ void synchronize_rcu_bh(void);
++#endif
+ void synchronize_sched_expedited(void);
+ void synchronize_rcu_expedited(void);
+ 
+@@ -72,7 +76,11 @@ static inline void synchronize_rcu_bh_expedited(void)
+ }
+ 
+ void rcu_barrier(void);
++#ifdef CONFIG_PREEMPT_RT_FULL
++# define rcu_barrier_bh		rcu_barrier
++#else
+ void rcu_barrier_bh(void);
++#endif
+ void rcu_barrier_sched(void);
+ bool rcu_eqs_special_set(int cpu);
+ unsigned long get_state_synchronize_rcu(void);
+diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
+index 4d04683c31b2..808cce9a5d43 100644
+--- a/kernel/rcu/rcu.h
++++ b/kernel/rcu/rcu.h
+@@ -528,7 +528,6 @@ static inline void show_rcu_gp_kthreads(void) { }
+ static inline int rcu_get_gp_kthreads_prio(void) { return 0; }
+ #else /* #ifdef CONFIG_TINY_RCU */
+ unsigned long rcu_get_gp_seq(void);
+-unsigned long rcu_bh_get_gp_seq(void);
+ unsigned long rcu_sched_get_gp_seq(void);
+ unsigned long rcu_exp_batches_completed(void);
+ unsigned long rcu_exp_batches_completed_sched(void);
+@@ -536,10 +535,18 @@ unsigned long srcu_batches_completed(struct srcu_struct *sp);
+ void show_rcu_gp_kthreads(void);
+ int rcu_get_gp_kthreads_prio(void);
+ void rcu_force_quiescent_state(void);
+-void rcu_bh_force_quiescent_state(void);
+ void rcu_sched_force_quiescent_state(void);
+ extern struct workqueue_struct *rcu_gp_wq;
+ extern struct workqueue_struct *rcu_par_gp_wq;
++
++#ifdef CONFIG_PREEMPT_RT_FULL
++#define rcu_bh_get_gp_seq		rcu_get_gp_seq
++#define rcu_bh_force_quiescent_state	rcu_force_quiescent_state
++#else
++unsigned long rcu_bh_get_gp_seq(void);
++void rcu_bh_force_quiescent_state(void);
++#endif
++
+ #endif /* #else #ifdef CONFIG_TINY_RCU */
+ 
+ #ifdef CONFIG_RCU_NOCB_CPU
+diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
+index 0b7af7e2bcbb..e95d121efc80 100644
+--- a/kernel/rcu/rcutorture.c
++++ b/kernel/rcu/rcutorture.c
+@@ -434,6 +434,7 @@ static struct rcu_torture_ops rcu_ops = {
+ 	.name		= "rcu"
+ };
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ /*
+  * Definitions for rcu_bh torture testing.
+  */
+@@ -475,6 +476,12 @@ static struct rcu_torture_ops rcu_bh_ops = {
+ 	.name		= "rcu_bh"
+ };
+ 
++#else
++static struct rcu_torture_ops rcu_bh_ops = {
++	.ttype		= INVALID_RCU_FLAVOR,
++};
++#endif
++
+ /*
+  * Don't even think about trying any of these in real life!!!
+  * The names includes "busted", and they really means it!
+diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
+index f7e89c989df7..1456a3d97971 100644
+--- a/kernel/rcu/tree.c
++++ b/kernel/rcu/tree.c
+@@ -244,6 +244,7 @@ void rcu_sched_qs(void)
+ 			   this_cpu_ptr(&rcu_sched_data), true);
+ }
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ void rcu_bh_qs(void)
+ {
+ 	RCU_LOCKDEP_WARN(preemptible(), "rcu_bh_qs() invoked with preemption enabled!!!");
+@@ -254,6 +255,11 @@ void rcu_bh_qs(void)
+ 		__this_cpu_write(rcu_bh_data.cpu_no_qs.b.norm, false);
+ 	}
+ }
++#else
++void rcu_bh_qs(void)
++{
++}
++#endif
+ 
+ /*
+  * Steal a bit from the bottom of ->dynticks for idle entry/exit
+@@ -568,6 +574,7 @@ unsigned long rcu_sched_get_gp_seq(void)
+ }
+ EXPORT_SYMBOL_GPL(rcu_sched_get_gp_seq);
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ /*
+  * Return the number of RCU-bh GPs completed thus far for debug & stats.
+  */
+@@ -576,6 +583,7 @@ unsigned long rcu_bh_get_gp_seq(void)
+ 	return READ_ONCE(rcu_bh_state.gp_seq);
+ }
+ EXPORT_SYMBOL_GPL(rcu_bh_get_gp_seq);
++#endif
+ 
+ /*
+  * Return the number of RCU expedited batches completed thus far for
+@@ -599,6 +607,7 @@ unsigned long rcu_exp_batches_completed_sched(void)
+ }
+ EXPORT_SYMBOL_GPL(rcu_exp_batches_completed_sched);
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ /*
+  * Force a quiescent state.
+  */
+@@ -617,6 +626,13 @@ void rcu_bh_force_quiescent_state(void)
+ }
+ EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state);
+ 
++#else
++void rcu_force_quiescent_state(void)
++{
++}
++EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);
++#endif
++
+ /*
+  * Force a quiescent state for RCU-sched.
+  */
+@@ -674,9 +690,11 @@ void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
+ 	case RCU_FLAVOR:
+ 		rsp = rcu_state_p;
+ 		break;
++#ifndef CONFIG_PREEMPT_RT_FULL
+ 	case RCU_BH_FLAVOR:
+ 		rsp = &rcu_bh_state;
+ 		break;
++#endif
+ 	case RCU_SCHED_FLAVOR:
+ 		rsp = &rcu_sched_state;
+ 		break;
+@@ -3057,6 +3075,7 @@ void call_rcu_sched(struct rcu_head *head, rcu_callback_t func)
+ }
+ EXPORT_SYMBOL_GPL(call_rcu_sched);
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ /**
+  * call_rcu_bh() - Queue an RCU for invocation after a quicker grace period.
+  * @head: structure to be used for queueing the RCU updates.
+@@ -3084,6 +3103,7 @@ void call_rcu_bh(struct rcu_head *head, rcu_callback_t func)
+ 	__call_rcu(head, func, &rcu_bh_state, -1, 0);
+ }
+ EXPORT_SYMBOL_GPL(call_rcu_bh);
++#endif
+ 
+ /*
+  * Queue an RCU callback for lazy invocation after a grace period.
+@@ -3169,6 +3189,7 @@ void synchronize_sched(void)
+ }
+ EXPORT_SYMBOL_GPL(synchronize_sched);
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ /**
+  * synchronize_rcu_bh - wait until an rcu_bh grace period has elapsed.
+  *
+@@ -3195,6 +3216,7 @@ void synchronize_rcu_bh(void)
+ 		wait_rcu_gp(call_rcu_bh);
+ }
+ EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
++#endif
+ 
+ /**
+  * get_state_synchronize_rcu - Snapshot current RCU state
+@@ -3502,6 +3524,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
+ 	mutex_unlock(&rsp->barrier_mutex);
+ }
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ /**
+  * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete.
+  */
+@@ -3510,6 +3533,7 @@ void rcu_barrier_bh(void)
+ 	_rcu_barrier(&rcu_bh_state);
+ }
+ EXPORT_SYMBOL_GPL(rcu_barrier_bh);
++#endif
+ 
+ /**
+  * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks.
+@@ -4157,7 +4181,9 @@ void __init rcu_init(void)
+ 
+ 	rcu_bootup_announce();
+ 	rcu_init_geometry();
++#ifndef CONFIG_PREEMPT_RT_FULL
+ 	rcu_init_one(&rcu_bh_state);
++#endif
+ 	rcu_init_one(&rcu_sched_state);
+ 	if (dump_tree)
+ 		rcu_dump_rcu_node_tree(&rcu_sched_state);
+diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
+index 4e74df768c57..fbbff7c21148 100644
+--- a/kernel/rcu/tree.h
++++ b/kernel/rcu/tree.h
+@@ -413,7 +413,9 @@ extern struct list_head rcu_struct_flavors;
+  */
+ extern struct rcu_state rcu_sched_state;
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ extern struct rcu_state rcu_bh_state;
++#endif
+ 
+ #ifdef CONFIG_PREEMPT_RCU
+ extern struct rcu_state rcu_preempt_state;
+diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
+index 81688a133552..6ffafb1b1584 100644
+--- a/kernel/rcu/update.c
++++ b/kernel/rcu/update.c
+@@ -288,6 +288,7 @@ int rcu_read_lock_held(void)
+ }
+ EXPORT_SYMBOL_GPL(rcu_read_lock_held);
+ 
++#ifndef CONFIG_PREEMPT_RT_FULL
+ /**
+  * rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section?
+  *
+@@ -314,6 +315,7 @@ int rcu_read_lock_bh_held(void)
+ 	return in_softirq() || irqs_disabled();
+ }
+ EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
++#endif
+ 
+ #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
+ 
+-- 
+2.36.1
+