6 files changed, 23 insertions, 5 deletions

diff --git a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h
index 2833fa2c0dd0..54d6d7aea938 100644
--- a/include/asm-i386/thread_info.h
+++ b/include/asm-i386/thread_info.h
@@ -140,6 +140,8 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SECCOMP             8       /* secure computing */
 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
 #define TIF_MEMDIE              16
+#define TIF_DEBUG               17      /* uses debug registers */
+#define TIF_IO_BITMAP           18      /* uses I/O bitmap */
 
 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
@@ -151,6 +153,8 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
+#define _TIF_DEBUG              (1<<TIF_DEBUG)
+#define _TIF_IO_BITMAP          (1<<TIF_IO_BITMAP)
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK \
@@ -159,6 +163,9 @@ static inline struct thread_info *current_thread_info(void)
 /* work to do on any return to u-space */
 #define _TIF_ALLWORK_MASK       (0x0000FFFF & ~_TIF_SECCOMP)
 
+/* flags to check in __switch_to() */
+#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP)
+
 /*
  * Thread-synchronous status.
  *
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index a7e8cef73d15..7520cc1ff9e2 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -11,7 +11,7 @@ enum blktrace_cat {
         BLK_TC_READ     = 1 << 0,       /* reads */
         BLK_TC_WRITE    = 1 << 1,       /* writes */
         BLK_TC_BARRIER  = 1 << 2,       /* barrier */
-        BLK_TC_SYNC     = 1 << 3,       /* barrier */
+        BLK_TC_SYNC     = 1 << 3,       /* sync IO */
         BLK_TC_QUEUE    = 1 << 4,       /* queueing/merging */
         BLK_TC_REQUEUE  = 1 << 5,       /* requeueing */
         BLK_TC_ISSUE    = 1 << 6,       /* issue */
@@ -19,6 +19,7 @@ enum blktrace_cat {
         BLK_TC_FS       = 1 << 8,       /* fs requests */
         BLK_TC_PC       = 1 << 9,       /* pc requests */
         BLK_TC_NOTIFY   = 1 << 10,      /* special message */
+        BLK_TC_AHEAD    = 1 << 11,      /* readahead */
 
         BLK_TC_END      = 1 << 15,      /* only 16-bits, reminder */
 };
@@ -147,7 +148,7 @@ static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
                                     u32 what)
 {
         struct blk_trace *bt = q->blk_trace;
-        int rw = rq->flags & 0x07;
+        int rw = rq->flags & 0x03;
 
         if (likely(!bt))
                 return;
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 85f99f60deea..76cc099c8580 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -549,6 +549,7 @@ struct packet_type {
                                          struct net_device *);
         struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
                                                 int features);
+        int                     (*gso_send_check)(struct sk_buff *skb);
         void                    *af_packet_priv;
         struct list_head        list;
 };
@@ -1001,13 +1002,14 @@ static inline int net_gso_ok(int features, int gso_type)
 
 static inline int skb_gso_ok(struct sk_buff *skb, int features)
 {
-        return net_gso_ok(features, skb_shinfo(skb)->gso_size ?
-                                    skb_shinfo(skb)->gso_type : 0);
+        return net_gso_ok(features, skb_shinfo(skb)->gso_type);
 }
 
 static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
 {
-        return !skb_gso_ok(skb, dev->features);
+        return skb_is_gso(skb) &&
+               (!skb_gso_ok(skb, dev->features) ||
+                unlikely(skb->ip_summed != CHECKSUM_HW));
 }
 
 #endif /* __KERNEL__ */
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3597b4f14389..0bf31b83578c 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1455,5 +1455,10 @@ static inline void skb_init_secmark(struct sk_buff *skb)
 { }
 #endif
 
+static inline int skb_is_gso(const struct sk_buff *skb)
+{
+        return skb_shinfo(skb)->gso_size;
+}
+
 #endif  /* __KERNEL__ */
 #endif  /* _LINUX_SKBUFF_H */
diff --git a/include/net/protocol.h b/include/net/protocol.h
index a225d6371cb1..c643bce64e55 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -36,6 +36,7 @@
 struct net_protocol {
         int                     (*handler)(struct sk_buff *skb);
         void                    (*err_handler)(struct sk_buff *skb, u32 info);
+        int                     (*gso_send_check)(struct sk_buff *skb);
         struct sk_buff         *(*gso_segment)(struct sk_buff *skb,
                                                int features);
         int                     no_policy;
@@ -51,6 +52,7 @@ struct inet6_protocol
                                int type, int code, int offset,
                                __u32 info);
 
+        int     (*gso_send_check)(struct sk_buff *skb);
         struct sk_buff *(*gso_segment)(struct sk_buff *skb,
                                        int features);
 
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3cd803b0d7a5..0720bddff1e9 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1086,6 +1086,7 @@ extern struct request_sock_ops tcp_request_sock_ops;
 
 extern int tcp_v4_destroy_sock(struct sock *sk);
 
+extern int tcp_v4_gso_send_check(struct sk_buff *skb);
 extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features);
 
 #ifdef CONFIG_PROC_FS