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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.
     *
     * 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
    
    #define _BITUL(x)	(_AC(1,UL) << (x))
    #define _BITULL(x)	(_AC(1,ULL) << (x))
    
    #endif /* !(_LINUX_CONST_H) */