1 files changed, 42 insertions, 0 deletions
diff --git a/debian/patches/0003-ipc-use-fast-modulo-operation-in-local-hash-table.patch b/debian/patches/0003-ipc-use-fast-modulo-operation-in-local-hash-table.patch
new file mode 100644
index 0000000..c517291
--- /dev/null
+++ b/debian/patches/0003-ipc-use-fast-modulo-operation-in-local-hash-table.patch
@@ -0,0 +1,42 @@
+From 3a0fae39873c9c7d73dc978888e45b87ad27d44e Mon Sep 17 00:00:00 2001
+From: Justus Winter <4winter@informatik.uni-hamburg.de>
+Date: Tue, 30 Sep 2014 03:58:43 +0200
+Subject: [PATCH gnumach 3/3] ipc: use fast modulo operation in local hash
+ table
+
+* ipc/ipc_table.h: Document that table sizes must be powers of two.
+* ipc/ipc_hash.c (IH_LOCAL_HASH): Use fast modulo operation.
+---
+ ipc/ipc_hash.c  | 2 +-
+ ipc/ipc_table.h | 2 ++
+ 2 files changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/ipc/ipc_hash.c b/ipc/ipc_hash.c
+index 8285717..c2c6d6e 100644
+--- a/ipc/ipc_hash.c
++++ b/ipc/ipc_hash.c
+@@ -326,7 +326,7 @@ ipc_hash_global_delete(
+  */
+ 
+ #define	IH_LOCAL_HASH(obj, size)				\
+-		((((mach_port_index_t) (vm_offset_t) (obj)) >> 6) % (size))
++	((((mach_port_index_t) (vm_offset_t) (obj)) >> 6) & (size - 1))
+ 
+ /*
+  *	Routine:	ipc_hash_local_lookup
+diff --git a/ipc/ipc_table.h b/ipc/ipc_table.h
+index 3cc5f56..311b9a7 100644
+--- a/ipc/ipc_table.h
++++ b/ipc/ipc_table.h
+@@ -45,6 +45,8 @@
+  *	an ipc_table_size structure.  These structures must
+  *	be elements of an array, ipc_table_entries.
+  *
++ *	Every its_size value must must be a power of two.
++ *
+  *	The array must end with two elements with the same its_size value.
+  *	Except for the terminating element, the its_size values must
+  *	be strictly increasing.  The largest (last) its_size value
+-- 
+2.1.0
+