From: Karel Zak <kzak@redhat.com>
Date: Fri, 20 Jul 2018 13:22:35 +0000 (+0200)
Subject: include/list, include/c: update and container_of()
X-Git-Tag: v2.33-rc1~110
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=eb06d5d4;p=thirdparty%2Futil-linux.git

include/list, include/c: update and container_of()

* update container_of() to version without "const" qualifier

* use container_of() in list_entry()

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/include/c.h b/include/c.h
index c8bcb375b2..a240f4f6c5 100644
--- a/include/c.h
+++ b/include/c.h
@@ -129,10 +129,16 @@
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #endif
 
+/*
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr:	the pointer to the member.
+ * @type:	the type of the container struct this is embedded in.
+ * @member:	the name of the member within the struct.
+ */
 #ifndef container_of
-#define container_of(ptr, type, member) __extension__ ({	 \
-	const __typeof__( ((type *)0)->member ) *__mptr = (ptr); \
-	(type *)( (char *)__mptr - offsetof(type,member) );})
+#define container_of(ptr, type, member) __extension__ ({	\
+	void *__mptr = (void *)(ptr);				\
+	((type *)(__mptr - offsetof(type, member))); })
 #endif
 
 #ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
diff --git a/include/list.h b/include/list.h
index cf022fb225..f3ffc79859 100644
--- a/include/list.h
+++ b/include/list.h
@@ -12,6 +12,8 @@
 #ifndef UTIL_LINUX_LIST_H
 #define UTIL_LINUX_LIST_H
 
+#include "c.h"
+
 /* TODO: use AC_C_INLINE */
 #ifdef __GNUC__
 #define _INLINE_ static __inline__
@@ -161,10 +163,7 @@ _INLINE_ void list_splice(struct list_head *list, struct list_head *head)
  * @type:	the type of the struct this is embedded in.
  * @member:	the name of the list_struct within the struct.
  */
-#define list_entry(ptr, type, member) __extension__ ({              \
-	const typeof( ((type *)0)->member ) *__mptr = (ptr);   \
-	(type *)( (char *)__mptr - offsetof(type,member) );})
-
+#define list_entry(ptr, type, member)	container_of(ptr, type, member)
 
 #define list_first_entry(head, type, member) \
 	((head) && (head)->next != (head) ? list_entry((head)->next, type, member) : NULL)