[ANNOUNCE] v5.9-rt16

[Sebastian Andrzej Siewior]

Dear RT folks!

I'm pleased to announce the v5.9-rt16 patch set. 

Changes since v5.9-rt15:

  - The rtmutex rework resulted in "unused variable" warnings if built
    without lockdep. Reported by Mike Galbraith.

  - The softirq rework led to a warning which could be triggered by the
    `ss' tool. Reported by Mike Galbraith.

  - The migrate-disable rework removed a data from a trace-event. Adding
    it bad resulted in a compile failure for !RT. Patch by Clark
    Williams.

Known issues
     - It has been pointed out that due to changes to the printk code the
       internal buffer representation changed. This is only an issue if tools
       like `crash' are used to extract the printk buffer from a kernel memory
       image.

The delta patch against v5.9-rt15 is appended below and can be found here:
 
     https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.9/incr/patch-5.9-rt15-rt16.patch.xz

You can get this release via the git tree at:

    git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.9-rt16

The RT patch against v5.9 can be found here:

    https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.9/older/patch-5.9-rt16.patch.xz

The split quilt queue is available at:

    https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.9/older/patches-5.9-rt16.tar.xz

Sebastian

diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
index ac2be04c59fa7..3085132eae383 100644
--- a/include/linux/spinlock_rt.h
+++ b/include/linux/spinlock_rt.h
@@ -69,10 +69,10 @@ extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock);
 		rt_spin_lock_nested(lock, subclass);	\
 	} while (0)
 
-# define spin_lock_nest_lock(lock, nest_lock)		\
+# define spin_lock_nest_lock(lock, subclass)		\
 	do {                                                           \
-		typecheck(struct lockdep_map *, &(nest_lock)->dep_map);	\
-		rt_spin_lock_nest_lock(lock, &(nest_lock)->dep_map);	\
+		typecheck(struct lockdep_map *, &(subclass)->dep_map);	\
+		rt_spin_lock_nest_lock(lock, &(subclass)->dep_map);	\
 	} while (0)
 
 # define spin_lock_irqsave_nested(lock, flags, subclass) \
@@ -82,15 +82,15 @@ extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock);
 		rt_spin_lock_nested(lock, subclass);	 \
 	} while (0)
 #else
-# define spin_lock_nested(lock, subclass)	spin_lock(lock)
-# define spin_lock_nest_lock(lock, nest_lock)	spin_lock(lock)
-# define spin_lock_bh_nested(lock, subclass)	spin_lock_bh(lock)
+# define spin_lock_nested(lock, subclass)	spin_lock(((void)(subclass), (lock)))
+# define spin_lock_nest_lock(lock, subclass)	spin_lock(((void)(subclass), (lock)))
+# define spin_lock_bh_nested(lock, subclass)	spin_lock_bh(((void)(subclass), (lock)))
 
 # define spin_lock_irqsave_nested(lock, flags, subclass) \
 	do {						 \
 		typecheck(unsigned long, flags);	 \
 		flags = 0;				 \
-		spin_lock(lock);			 \
+		spin_lock(((void)(subclass), (lock)));	 \
 	} while (0)
 #endif
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index aa7f3bef6d4fa..21706f318a001 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2437,6 +2437,15 @@ enum print_line_t trace_handle_return(struct trace_seq *s)
 }
 EXPORT_SYMBOL_GPL(trace_handle_return);
 
+static unsigned short migration_disable_value(struct task_struct *tsk)
+{
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)
+	return tsk ? tsk->migration_disabled : 0;
+#else
+	return 0;
+#endif
+}
+
 void
 tracing_generic_entry_update(struct trace_entry *entry, unsigned short type,
 			     unsigned long flags, int pc)
@@ -2460,7 +2469,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned short type,
 		(need_resched_lazy() ? TRACE_FLAG_NEED_RESCHED_LAZY : 0) |
 		(test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
 
-	entry->migrate_disable = (tsk) ? tsk->migration_disabled & 0xFF : 0;
+	entry->migrate_disable = migration_disable_value(tsk);
 }
 EXPORT_SYMBOL_GPL(tracing_generic_entry_update);
 
diff --git a/localversion-rt b/localversion-rt
index 18777ec0c27d4..1199ebade17b4 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt15
+-rt16
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 239e54474b653..fcb105cbb5465 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -585,7 +585,9 @@ int __inet_hash(struct sock *sk, struct sock *osk)
 	int err = 0;
 
 	if (sk->sk_state != TCP_LISTEN) {
+		local_bh_disable();
 		inet_ehash_nolisten(sk, osk);
+		local_bh_enable();
 		return 0;
 	}
 	WARN_ON(!sk_unhashed(sk));
@@ -617,11 +619,8 @@ int inet_hash(struct sock *sk)
 {
 	int err = 0;
 
-	if (sk->sk_state != TCP_CLOSE) {
-		local_bh_disable();
+	if (sk->sk_state != TCP_CLOSE)
 		err = __inet_hash(sk, NULL);
-		local_bh_enable();
-	}
 
 	return err;
 }
@@ -632,17 +631,20 @@ void inet_unhash(struct sock *sk)
 	struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
 	struct inet_listen_hashbucket *ilb = NULL;
 	spinlock_t *lock;
+	bool state_listen;
 
 	if (sk_unhashed(sk))
 		return;
 
 	if (sk->sk_state == TCP_LISTEN) {
+		state_listen = true;
 		ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
-		lock = &ilb->lock;
+		spin_lock(&ilb->lock);
 	} else {
+		state_listen = false;
 		lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
+		spin_lock_bh(lock);
 	}
-	spin_lock_bh(lock);
 	if (sk_unhashed(sk))
 		goto unlock;
 
@@ -655,7 +657,10 @@ void inet_unhash(struct sock *sk)
 	__sk_nulls_del_node_init_rcu(sk);
 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 unlock:
-	spin_unlock_bh(lock);
+	if (state_listen)
+		spin_unlock(&ilb->lock);
+	else
+		spin_unlock_bh(lock);
 }
 EXPORT_SYMBOL_GPL(inet_unhash);
 
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 2d3add9e61162..50fd17cbf3ec7 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -335,11 +335,8 @@ int inet6_hash(struct sock *sk)
 {
 	int err = 0;
 
-	if (sk->sk_state != TCP_CLOSE) {
-		local_bh_disable();
+	if (sk->sk_state != TCP_CLOSE)
 		err = __inet_hash(sk, NULL);
-		local_bh_enable();
-	}
 
 	return err;
 }