--- /dev/null
+commit a79ff731a1b277d0e92d9453bdf374e04cec717a
+Author: Alexey Dobriyan <adobriyan@gmail.com>
+Date: Tue Apr 13 11:21:46 2010 +0200
+
+ netfilter: xtables: make XT_ALIGN() usable in exported headers by exporting __ALIGN_KERNEL()
+
+ XT_ALIGN() was rewritten through ALIGN() by commit 42107f5009da223daa800d6da6904d77297ae829
+ "netfilter: xtables: symmetric COMPAT_XT_ALIGN definition".
+ ALIGN() is not exported in userspace headers, which created compile problem for tc(8)
+ and will create problem for iptables(8).
+
+ We can't export generic looking name ALIGN() but we can export less generic
+ __ALIGN_KERNEL() (suggested by Ben Hutchings).
+ Google knows nothing about __ALIGN_KERNEL().
+
+ COMPAT_XT_ALIGN() changed for symmetry.
+
+ Reported-by: Andreas Henriksson <andreas@fatal.se>
+ Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
+ Signed-off-by: Patrick McHardy <kaber@trash.net>
+
+diff --git a/include/linux/kernel.h b/include/linux/kernel.h
+index 7f07074..284ea99 100644
+--- a/include/linux/kernel.h
++++ b/include/linux/kernel.h
+@@ -4,6 +4,8 @@
+ /*
+ * 'kernel.h' contains some often-used function prototypes etc
+ */
++#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
++#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
+
+ #ifdef __KERNEL__
+
+@@ -37,8 +39,7 @@ extern const char linux_proc_banner[];
+
+ #define STACK_MAGIC 0xdeadbeef
+
+-#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
+-#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
++#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
+ #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
+ #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
+
+diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
+index 1a65d45..26ced0c 100644
+--- a/include/linux/netfilter/x_tables.h
++++ b/include/linux/netfilter/x_tables.h
+@@ -1,6 +1,6 @@
+ #ifndef _X_TABLES_H
+ #define _X_TABLES_H
+-
++#include <linux/kernel.h>
+ #include <linux/types.h>
+
+ #define XT_FUNCTION_MAXNAMELEN 30
+@@ -93,7 +93,7 @@ struct _xt_align {
+ __u64 u64;
+ };
+
+-#define XT_ALIGN(s) ALIGN((s), __alignof__(struct _xt_align))
++#define XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _xt_align))
+
+ /* Standard return verdict, or do jump. */
+ #define XT_STANDARD_TARGET ""
+@@ -603,7 +603,7 @@ struct _compat_xt_align {
+ compat_u64 u64;
+ };
+
+-#define COMPAT_XT_ALIGN(s) ALIGN((s), __alignof__(struct _compat_xt_align))
++#define COMPAT_XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _compat_xt_align))
+
+ extern void xt_compat_lock(u_int8_t af);
+ extern void xt_compat_unlock(u_int8_t af);