linux/kernel.h, linux/array_size.h: Split ARRAY_SIZE() into a separat…

…e header

Include <linux/array_size.h> from <linux/kernel.h> for compatibility.

Include <linux/compiler.h> for __must_be_array().

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

include/linux/array_size.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_ARRAY_SIZE_H
+#define _LINUX_ARRAY_SIZE_H
+
+#include <linux/compiler.h>
+
+
+/**
+ * ARRAY_SIZE - get the number of elements in array @a
+ * @a: array to be sized
+ */
+#define ARRAY_SIZE(a)  (sizeof((a)) / sizeof((a)[0]) + __must_be_array(a))
+
+
+#endif  /* _LINUX_ARRAY_SIZE_H */

include/linux/kernel.h

@@ -2,6 +2,8 @@
 #ifndef _LINUX_KERNEL_H
 #define _LINUX_KERNEL_H
 
+
+#include <linux/array_size.h>
 #include <linux/stdarg.h>
 #include <linux/align.h>
 #include <linux/limits.h>
@@ -25,6 +27,7 @@
 
 #include <uapi/linux/kernel.h>
 
+
 #define STACK_MAGIC	0xdeadbeef
 
 /**
@@ -39,12 +42,6 @@
 #define READ			0
 #define WRITE			1
 
-/**
- * ARRAY_SIZE - get the number of elements in array @arr
- * @arr: array to be sized
- */
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
-
 #define PTR_IF(cond, ptr)	((cond) ? (ptr) : NULL)
 
 #define u64_to_user_ptr(x) (		\