[net-next-2.6.git] / include / linux / const.h

/* const.h: Macros for dealing with constants.  */

#ifndef _LINUX_CONST_H
#define _LINUX_CONST_H

/* Some constant macros are used in both assembler and
 * 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) */
Commit	Line	Data
9d291e78 VG	1	/* const.h: Macros for dealing with constants. */
9d291e78 VG	2
6df95fd7 RD	3	#ifndef _LINUX_CONST_H
6df95fd7 RD	4	#define _LINUX_CONST_H
9d291e78 VG	5
	6	/* Some constant macros are used in both assembler and
	7	* C code. Therefore we cannot annotate them always with
6df95fd7	8	* 'UL' and other type specifiers unilaterally. We
9d291e78	9	* use the following macros to deal with this.
74ef649f JF	10	*
	11	* Similarly, _AT() will cast an expression with a type in C, but
	12	* leave it unchanged in asm.
9d291e78 VG	13	*/
	14
	15	#ifdef __ASSEMBLY__
	16	#define _AC(X,Y) X
74ef649f	17	#define _AT(T,X) X
9d291e78 VG	18	#else
	19	#define __AC(X,Y) (X##Y)
	20	#define _AC(X,Y) __AC(X,Y)
74ef649f	21	#define _AT(T,X) ((T)(X))
9d291e78 VG	22	#endif
9d291e78 VG	23
6df95fd7	24	#endif /* !(_LINUX_CONST_H) */