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x86: add _AT() macro to conditionally cast

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# 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>
This commit is contained in:
Jeremy Fitzhardinge 2008-01-30 13:32:42 +01:00 committed by Ingo Molnar
parent 345b904c3f
commit 74ef649fe8
1 changed files with 5 additions and 0 deletions
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5
include/linux/const.h
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@ -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) */