Messages in this thread Patch in this message | | | Subject | [PATCH 3 of 8] x86: add _AT() macro to conditionally cast | Date | Thu, 03 Jan 2008 12:11:00 -0800 | From | Jeremy Fitzhardinge <> |
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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>
--- include/linux/const.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/linux/const.h b/include/linux/const.h --- 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) */
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