[PATCH] severing skbuff.h -> highmem.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/core/sock.c b/net/core/sock.c
index ab8fafa..419c7d3 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -111,6 +111,7 @@
 #include <linux/poll.h>
 #include <linux/tcp.h>
 #include <linux/init.h>
+#include <linux/highmem.h>
 
 #include <asm/uaccess.h>
 #include <asm/system.h>