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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-01-30 15:32:42 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 15:32:42 +0300 |
| commit | 74ef649fe847fdfbd3e1732d21b923f59ca04e8c (patch) | |
| tree | cef6615597cc78bb507ff971f409530f14b962ff /include/linux/const.h | |
| parent | 345b904c3f7c24fbfadfee7cddd5896d13b176d9 (diff) | |
| download | linux-74ef649fe847fdfbd3e1732d21b923f59ca04e8c.tar.xz | |
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>
Diffstat (limited to 'include/linux/const.h')
| -rw-r--r-- | include/linux/const.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/const.h b/include/linux/const.h index 07b300bfe34b..c22c707c455d 100644 --- a/include/linux/const.h +++ b/include/linux/const.h @@ -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) */ |