Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into common/serial-rework

Conflicts:
	arch/sh/kernel/cpu/sh2/setup-sh7619.c
	arch/sh/kernel/cpu/sh2a/setup-mxg.c
	arch/sh/kernel/cpu/sh2a/setup-sh7201.c
	arch/sh/kernel/cpu/sh2a/setup-sh7203.c
	arch/sh/kernel/cpu/sh2a/setup-sh7206.c
	arch/sh/kernel/cpu/sh3/setup-sh7705.c
	arch/sh/kernel/cpu/sh3/setup-sh770x.c
	arch/sh/kernel/cpu/sh3/setup-sh7710.c
	arch/sh/kernel/cpu/sh3/setup-sh7720.c
	arch/sh/kernel/cpu/sh4/setup-sh4-202.c
	arch/sh/kernel/cpu/sh4/setup-sh7750.c
	arch/sh/kernel/cpu/sh4/setup-sh7760.c
	arch/sh/kernel/cpu/sh4a/setup-sh7343.c
	arch/sh/kernel/cpu/sh4a/setup-sh7366.c
	arch/sh/kernel/cpu/sh4a/setup-sh7722.c
	arch/sh/kernel/cpu/sh4a/setup-sh7723.c
	arch/sh/kernel/cpu/sh4a/setup-sh7724.c
	arch/sh/kernel/cpu/sh4a/setup-sh7763.c
	arch/sh/kernel/cpu/sh4a/setup-sh7770.c
	arch/sh/kernel/cpu/sh4a/setup-sh7780.c
	arch/sh/kernel/cpu/sh4a/setup-sh7785.c
	arch/sh/kernel/cpu/sh4a/setup-sh7786.c
	arch/sh/kernel/cpu/sh4a/setup-shx3.c
	arch/sh/kernel/cpu/sh5/setup-sh5.c
	drivers/serial/sh-sci.c
	drivers/serial/sh-sci.h
	include/linux/serial_sci.h

1 files changed, 59 insertions, 18 deletions

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 15e1f8fe4c1f..599d96e74114 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -11,43 +11,84 @@
 #include <linux/init.h>
 #include <linux/jiffies.h>
 #include <linux/spinlock.h>
+#include <net/ipv6.h>
 #include <asm/atomic.h>
 
-struct inet_peer
-{
+struct inetpeer_addr {
+	union {
+		__be32		a4;
+		__be32		a6[4];
+	};
+	__u16	family;
+};
+
+struct inet_peer {
 	/* group together avl_left,avl_right,v4daddr to speedup lookups */
-	struct inet_peer	*avl_left, *avl_right;
-	__be32			v4daddr;	/* peer's address */
-	__u16			avl_height;
-	__u16			ip_id_count;	/* IP ID for the next packet */
+	struct inet_peer __rcu	*avl_left, *avl_right;
+	struct inetpeer_addr	daddr;
+	__u32			avl_height;
 	struct list_head	unused;
 	__u32			dtime;		/* the time of last use of not
 						 * referenced entries */
 	atomic_t		refcnt;
-	atomic_t		rid;		/* Frag reception counter */
-	__u32			tcp_ts;
-	unsigned long		tcp_ts_stamp;
+	/*
+	 * Once inet_peer is queued for deletion (refcnt == -1), following fields
+	 * are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp
+	 * We can share memory with rcu_head to keep inet_peer small
+	 */
+	union {
+		struct {
+			atomic_t	rid;		/* Frag reception counter */
+			atomic_t	ip_id_count;	/* IP ID for the next packet */
+			__u32		tcp_ts;
+			__u32		tcp_ts_stamp;
+		};
+		struct rcu_head         rcu;
+	};
 };
 
 void			inet_initpeers(void) __init;
 
 /* can be called with or without local BH being disabled */
-struct inet_peer	*inet_getpeer(__be32 daddr, int create);
+struct inet_peer	*inet_getpeer(struct inetpeer_addr *daddr, int create);
+
+static inline struct inet_peer *inet_getpeer_v4(__be32 v4daddr, int create)
+{
+	struct inetpeer_addr daddr;
+
+	daddr.a4 = v4daddr;
+	daddr.family = AF_INET;
+	return inet_getpeer(&daddr, create);
+}
+
+static inline struct inet_peer *inet_getpeer_v6(struct in6_addr *v6daddr, int create)
+{
+	struct inetpeer_addr daddr;
+
+	ipv6_addr_copy((struct in6_addr *)daddr.a6, v6daddr);
+	daddr.family = AF_INET6;
+	return inet_getpeer(&daddr, create);
+}
 
 /* can be called from BH context or outside */
 extern void inet_putpeer(struct inet_peer *p);
 
-extern spinlock_t inet_peer_idlock;
+/*
+ * temporary check to make sure we dont access rid, ip_id_count, tcp_ts,
+ * tcp_ts_stamp if no refcount is taken on inet_peer
+ */
+static inline void inet_peer_refcheck(const struct inet_peer *p)
+{
+	WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0);
+}
+
+
 /* can be called with or without local BH being disabled */
 static inline __u16	inet_getid(struct inet_peer *p, int more)
 {
-	__u16 id;
-
-	spin_lock_bh(&inet_peer_idlock);
-	id = p->ip_id_count;
-	p->ip_id_count += 1 + more;
-	spin_unlock_bh(&inet_peer_idlock);
-	return id;
+	more++;
+	inet_peer_refcheck(p);
+	return atomic_add_return(more, &p->ip_id_count) - more;
 }
 
 #endif /* _NET_INETPEER_H */