linux-kernel - [PATCH] Break out types from <linux/list.h> to <linux/list

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Date:	Fri, 2 Jul 2010 13:41:14 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	<linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>
Cc:	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH] Break out types from <linux/list.h> to <linux/list_types.h>.

This allows a list_head (or hlist_head, etc.) to be used from places
that used to be impractical, in particular <asm/processor.h>, which
used to cause include file recursion: <linux/list.h> includes
<linux/prefetch.h>, which always includes <asm/processor.h> for the
prefetch macros, as well as <asm/system.h>, which often includes
<asm/processor.h> directly or indirectly.

This avoids a lot of painful workaround hackery on the tile
architecture, where we use a list_head in the thread_struct to chain
together tasks that are activated on a particular hardwall.

Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
---

 include/linux/list.h       |   13 +------------
 include/linux/list_types.h |   16 ++++++++++++++++
 2 files changed, 17 insertions(+), 12 deletions(-)
 create mode 100644 include/linux/list_types.h

diff --git a/include/linux/list.h b/include/linux/list.h
index 8392884..3a42003 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -4,6 +4,7 @@
 #include <linux/stddef.h>
 #include <linux/poison.h>
 #include <linux/prefetch.h>
+#include <linux/list_types.h>
 #include <asm/system.h>

 /*
@@ -16,10 +17,6 @@
  * using the generic single-entry routines.
  */

-struct list_head {
-	struct list_head *next, *prev;
-};
-
 #define LIST_HEAD_INIT(name) { &(name), &(name) }

 #define LIST_HEAD(name) \
@@ -551,14 +548,6 @@ static inline void list_splice_tail_init(struct list_head *list,
  * You lose the ability to access the tail in O(1).
  */

-struct hlist_head {
-	struct hlist_node *first;
-};
-
-struct hlist_node {
-	struct hlist_node *next, **pprev;
-};
-
 #define HLIST_HEAD_INIT { .first = NULL }
 #define HLIST_HEAD(name) struct hlist_head name = {  .first = NULL }
 #define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
diff --git a/include/linux/list_types.h b/include/linux/list_types.h
new file mode 100644
index 0000000..c991e28
--- /dev/null
+++ b/include/linux/list_types.h
@@ -0,0 +1,16 @@
+#ifndef _LINUX_LIST_TYPES_H
+#define _LINUX_LIST_TYPES_H
+
+struct list_head {
+	struct list_head *next, *prev;
+};
+
+struct hlist_head {
+	struct hlist_node *first;
+};
+
+struct hlist_node {
+	struct hlist_node *next, **pprev;
+};
+
+#endif
-- 
1.6.5.2

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