linux-sg2042/include/linux/const.h

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/* 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.
*/
#ifdef __ASSEMBLY__
#define _AC(X,Y) X
#else
#define __AC(X,Y) (X##Y)
#define _AC(X,Y) __AC(X,Y)
#endif
#endif /* !(_LINUX_CONST_H) */