Commit 74ef649f authored Jan 30, 2008 by Jeremy Fitzhardinge Committed by Ingo Molnar Jan 30, 2008

x86: add _AT() macro to conditionally cast



# HG changeset patch
# User Jeremy Fitzhardinge <jeremy@xensource.com>
# Date 1199317452 28800
# Node ID f7e7db3facd9406545103164f9be8f9ba1a2b549
# Parent  4d9a413a0f4c1d98dbea704f0366457b5117045d
x86: add _AT() macro to conditionally cast

Define _AT(type, value) to conditionally cast a value when compiling C
code, but not when used in assembler.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 345b904c

include/linux/const.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -7,13 +7,18 @@
		* C code. Therefore we cannot annotate them always with
		* 'UL' and other type specifiers unilaterally. We
		* use the following macros to deal with this.
		*
		* Similarly, _AT() will cast an expression with a type in C, but
		* leave it unchanged in asm.
		*/

		#ifdef __ASSEMBLY__
		#define _AC(X,Y) X
		#define _AT(T,X) X
		#else
		#define __AC(X,Y) (X##Y)
		#define _AC(X,Y) __AC(X,Y)
		#define _AT(T,X) ((T)(X))
		#endif

		#endif /* !(_LINUX_CONST_H) */