linux-kernel - [PATCH] debug, x86: move BUILD_BUG_ON() ARRAY_SIZE and __FUNCTION_

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Date:	Mon, 01 Sep 2008 16:07:01 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Ingo Molnar <mingo@...e.hu>, Rusty Russell <rusty@...tcorp.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	Ivo van Doorn <IvDoorn@...il.com>,
	"John W. Linville" <linville@...driver.com>
CC:	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jan Beulich <jbeulich@...ell.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] debug, x86: move BUILD_BUG_ON() ARRAY_SIZE and __FUNCTION__

From: Ingo Molnar <mingo@...e.hu>

move BUILD_BUG_ON variants, ARRAY_SIZE and __FUNCTION__
definitions from kernel.h to compiler.h.

Besides being the correct location for such trivial wrappers around
compiler functionality, this also allows the removal of duplicate
definitions from arch/x86/boot/boot.h.

[ boot.h cannot just include kernel.h to pick up the new definitions,
  as it is also built into user-space utilities on the host system. ]

Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Boaz Harrosh <bharrosh@...asas.com>
---
 arch/x86/boot/boot.h     |    5 -----
 include/linux/compiler.h |   14 ++++++++++++++
 include/linux/kernel.h   |   14 --------------
 3 files changed, 14 insertions(+), 19 deletions(-)

diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index cc0ef13..f09b79a 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -27,11 +27,6 @@
 #include "bitops.h"
 #include <asm/cpufeature.h>
 
-/* Useful macros */
-#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
-
 extern struct setup_header hdr;
 extern struct boot_params boot_params;
 
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index c8bd2da..90fa975 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -194,4 +194,18 @@ extern void __chk_io_ptr(const volatile void __iomem *);
  */
 #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
 
+/* Force a compilation error if condition is true */
+#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
+
+/* Force a compilation error if condition is true, but also produce a
+   result (of value 0 and type size_t), so the expression can be used
+   e.g. in a structure initializer (or where-ever else comma expressions
+   aren't permitted). */
+#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
+
+/* Trap pasters of __FUNCTION__ at compile-time */
+#define __FUNCTION__ (__func__)
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
+
 #endif /* __LINUX_COMPILER_H */
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 2651f80..29ca10d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -42,8 +42,6 @@ extern const char linux_proc_banner[];
 #define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
 #define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)
 
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
-
 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
@@ -467,18 +465,6 @@ struct sysinfo {
 	char _f[20-2*sizeof(long)-sizeof(int)];	/* Padding: libc5 uses this.. */
 };
 
-/* Force a compilation error if condition is true */
-#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
-
-/* Force a compilation error if condition is true, but also produce a
-   result (of value 0 and type size_t), so the expression can be used
-   e.g. in a structure initializer (or where-ever else comma expressions
-   aren't permitted). */
-#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
-
-/* Trap pasters of __FUNCTION__ at compile-time */
-#define __FUNCTION__ (__func__)
-
 /* This helps us to avoid #ifdef CONFIG_NUMA */
 #ifdef CONFIG_NUMA
 #define NUMA_BUILD 1
--
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