path: root/debian/patches/0008-ipc-inline-key-ipc-entry-lookup-functions.patch

From 5effd198f872beadbcee797aedeacbf35f860a71 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Wed, 1 Apr 2015 17:17:01 +0200
Subject: [PATCH gnumach 08/10] ipc: inline key ipc entry lookup functions

Declare functions looking up IPC entries that were previously inlined
manually with `static inline' so that they will be inlined into the
fast paths by the compiler.

* ipc/ipc_entry.c (ipc_entry_lookup, ipc_entry_get,
ipc_entry_dealloc): Move functions...
* ipc/ipc_space.h: ... here, and declare them as `static inline'.
* ipc/ipc_entry.h: Drop associated declarations.
---
 ipc/ipc_entry.c | 119 -------------------------------------------------------
 ipc/ipc_entry.h |   9 -----
 ipc/ipc_space.h | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+), 128 deletions(-)

diff --git a/ipc/ipc_entry.c b/ipc/ipc_entry.c
index 2d6e665..a5fe319 100644
--- a/ipc/ipc_entry.c
+++ b/ipc/ipc_entry.c
@@ -52,93 +52,6 @@
 struct kmem_cache ipc_entry_cache;
 
 /*
- *	Routine:	ipc_entry_lookup
- *	Purpose:
- *		Searches for an entry, given its name.
- *	Conditions:
- *		The space must be read or write locked throughout.
- *		The space must be active.
- */
-
-ipc_entry_t
-ipc_entry_lookup(
-	ipc_space_t space,
-	mach_port_t name)
-{
-	ipc_entry_t entry;
-
-	assert(space->is_active);
-	entry = rdxtree_lookup(&space->is_map, (rdxtree_key_t) name);
-	if (entry != IE_NULL
-	    && IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE)
-		entry = NULL;
-	assert((entry == IE_NULL) || IE_BITS_TYPE(entry->ie_bits));
-	return entry;
-}
-
-/*
- *	Routine:	ipc_entry_get
- *	Purpose:
- *		Tries to allocate an entry out of the space.
- *	Conditions:
- *		The space is write-locked and active throughout.
- *		An object may be locked.  Will not allocate memory.
- *	Returns:
- *		KERN_SUCCESS		A free entry was found.
- *		KERN_NO_SPACE		No entry allocated.
- */
-
-kern_return_t
-ipc_entry_get(
-	ipc_space_t space,
-	mach_port_t *namep,
-	ipc_entry_t *entryp)
-{
-	mach_port_t new_name;
-	ipc_entry_t free_entry;
-
-	assert(space->is_active);
-
-	/* Get entry from the free list.  */
-	free_entry = space->is_free_list;
-	if (free_entry == IE_NULL)
-		return KERN_NO_SPACE;
-
-	space->is_free_list = free_entry->ie_next_free;
-	space->is_free_list_size -= 1;
-
-	/*
-	 *	Initialize the new entry.  We need only
-	 *	increment the generation number and clear ie_request.
-	 */
-
-    {
-	mach_port_gen_t gen;
-
-	assert((free_entry->ie_bits &~ IE_BITS_GEN_MASK) == 0);
-	gen = free_entry->ie_bits + IE_BITS_GEN_ONE;
-	free_entry->ie_bits = gen;
-	free_entry->ie_request = 0;
-	new_name = MACH_PORT_MAKE(free_entry->ie_name, gen);
-    }
-
-	/*
-	 *	The new name can't be MACH_PORT_NULL because index
-	 *	is non-zero.  It can't be MACH_PORT_DEAD because
-	 *	the table isn't allowed to grow big enough.
-	 *	(See comment in ipc/ipc_table.h.)
-	 */
-
-	assert(MACH_PORT_VALID(new_name));
-	assert(free_entry->ie_object == IO_NULL);
-
-	space->is_size += 1;
-	*namep = new_name;
-	*entryp = free_entry;
-	return KERN_SUCCESS;
-}
-
-/*
  *	Routine:	ipc_entry_alloc
  *	Purpose:
  *		Allocate an entry out of the space.
@@ -293,38 +206,6 @@ ipc_entry_alloc_name(
 	return KERN_SUCCESS;
 }
 
-/*
- *	Routine:	ipc_entry_dealloc
- *	Purpose:
- *		Deallocates an entry from a space.
- *	Conditions:
- *		The space must be write-locked throughout.
- *		The space must be active.
- */
-
-void
-ipc_entry_dealloc(
-	ipc_space_t	space,
-	mach_port_t	name,
-	ipc_entry_t	entry)
-{
-	assert(space->is_active);
-	assert(entry->ie_object == IO_NULL);
-	assert(entry->ie_request == 0);
-
-	if (space->is_free_list_size < IS_FREE_LIST_SIZE_LIMIT) {
-		space->is_free_list_size += 1;
-		entry->ie_bits &= IE_BITS_GEN_MASK;
-		entry->ie_next_free = space->is_free_list;
-		space->is_free_list = entry;
-	} else {
-		rdxtree_remove(&space->is_map, (rdxtree_key_t) name);
-		ie_free(entry);
-	}
-	space->is_size -= 1;
-}
-
-
 #if	MACH_KDB
 #include <ddb/db_output.h>
 #include <kern/task.h>
diff --git a/ipc/ipc_entry.h b/ipc/ipc_entry.h
index 451dc53..ee3c2d4 100644
--- a/ipc/ipc_entry.h
+++ b/ipc/ipc_entry.h
@@ -104,21 +104,12 @@ extern struct kmem_cache ipc_entry_cache;
 #define ie_alloc()	((ipc_entry_t) kmem_cache_alloc(&ipc_entry_cache))
 #define	ie_free(e)	kmem_cache_free(&ipc_entry_cache, (vm_offset_t) (e))
 
-extern ipc_entry_t
-ipc_entry_lookup(ipc_space_t space, mach_port_t name);
-
-extern kern_return_t
-ipc_entry_get(ipc_space_t space, mach_port_t *namep, ipc_entry_t *entryp);
-
 extern kern_return_t
 ipc_entry_alloc(ipc_space_t space, mach_port_t *namep, ipc_entry_t *entryp);
 
 extern kern_return_t
 ipc_entry_alloc_name(ipc_space_t space, mach_port_t name, ipc_entry_t *entryp);
 
-extern void
-ipc_entry_dealloc(ipc_space_t space, mach_port_t name, ipc_entry_t entry);
-
 ipc_entry_t
 db_ipc_object_by_name(
 	task_t		task,
diff --git a/ipc/ipc_space.h b/ipc/ipc_space.h
index c90a2a3..404f708 100644
--- a/ipc/ipc_space.h
+++ b/ipc/ipc_space.h
@@ -137,6 +137,126 @@ kern_return_t	ipc_space_create(ipc_table_size_t, ipc_space_t *);
 kern_return_t	ipc_space_create_special(struct ipc_space **);
 void		ipc_space_destroy(struct ipc_space *);
 
+/* IPC entry lookups.  */
+
+/*
+ *	Routine:	ipc_entry_lookup
+ *	Purpose:
+ *		Searches for an entry, given its name.
+ *	Conditions:
+ *		The space must be read or write locked throughout.
+ *		The space must be active.
+ */
+
+static inline ipc_entry_t
+ipc_entry_lookup(
+	ipc_space_t space,
+	mach_port_t name)
+{
+	ipc_entry_t entry;
+
+	assert(space->is_active);
+	entry = rdxtree_lookup(&space->is_map, (rdxtree_key_t) name);
+	if (entry != IE_NULL
+	    && IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE)
+		entry = NULL;
+	assert((entry == IE_NULL) || IE_BITS_TYPE(entry->ie_bits));
+	return entry;
+}
+
+/*
+ *	Routine:	ipc_entry_get
+ *	Purpose:
+ *		Tries to allocate an entry out of the space.
+ *	Conditions:
+ *		The space is write-locked and active throughout.
+ *		An object may be locked.  Will not allocate memory.
+ *	Returns:
+ *		KERN_SUCCESS		A free entry was found.
+ *		KERN_NO_SPACE		No entry allocated.
+ */
+
+static inline kern_return_t
+ipc_entry_get(
+	ipc_space_t space,
+	mach_port_t *namep,
+	ipc_entry_t *entryp)
+{
+	mach_port_t new_name;
+	ipc_entry_t free_entry;
+
+	assert(space->is_active);
+
+	/* Get entry from the free list.  */
+	free_entry = space->is_free_list;
+	if (free_entry == IE_NULL)
+		return KERN_NO_SPACE;
+
+	space->is_free_list = free_entry->ie_next_free;
+	space->is_free_list_size -= 1;
+
+	/*
+	 *	Initialize the new entry.  We need only
+	 *	increment the generation number and clear ie_request.
+	 */
+
+    {
+	mach_port_gen_t gen;
+
+	assert((free_entry->ie_bits &~ IE_BITS_GEN_MASK) == 0);
+	gen = free_entry->ie_bits + IE_BITS_GEN_ONE;
+	free_entry->ie_bits = gen;
+	free_entry->ie_request = 0;
+	new_name = MACH_PORT_MAKE(free_entry->ie_name, gen);
+    }
+
+	/*
+	 *	The new name can't be MACH_PORT_NULL because index
+	 *	is non-zero.  It can't be MACH_PORT_DEAD because
+	 *	the table isn't allowed to grow big enough.
+	 *	(See comment in ipc/ipc_table.h.)
+	 */
+
+	assert(MACH_PORT_VALID(new_name));
+	assert(free_entry->ie_object == IO_NULL);
+
+	space->is_size += 1;
+	*namep = new_name;
+	*entryp = free_entry;
+	return KERN_SUCCESS;
+}
+
+/*
+ *	Routine:	ipc_entry_dealloc
+ *	Purpose:
+ *		Deallocates an entry from a space.
+ *	Conditions:
+ *		The space must be write-locked throughout.
+ *		The space must be active.
+ */
+
+static inline void
+ipc_entry_dealloc(
+	ipc_space_t	space,
+	mach_port_t	name,
+	ipc_entry_t	entry)
+{
+	assert(space->is_active);
+	assert(entry->ie_object == IO_NULL);
+	assert(entry->ie_request == 0);
+
+	if (space->is_free_list_size < IS_FREE_LIST_SIZE_LIMIT) {
+		space->is_free_list_size += 1;
+		entry->ie_bits &= IE_BITS_GEN_MASK;
+		entry->ie_next_free = space->is_free_list;
+		space->is_free_list = entry;
+	} else {
+		rdxtree_remove(&space->is_map, (rdxtree_key_t) name);
+		ie_free(entry);
+	}
+	space->is_size -= 1;
+}
+
 /* Reverse lookups.  */
 
 /* Cast a pointer to a suitable key.  */
-- 
2.1.4