cmpxchg.h

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#ifndef _ALPHA_CMPXCHG_H
#define _ALPHA_CMPXCHG_H

/*
 * Atomic exchange routines.
 */

#define __ASM__MB
#define ____xchg(type, args...)     __xchg ## type ## _local(args)
#define ____cmpxchg(type, args...)  __cmpxchg ## type ## _local(args)
#include <asm/xchg.h>

#define xchg_local(ptr, x)                      \
({                                  \
    __typeof__(*(ptr)) _x_ = (x);                   \
    (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_,    \
                       sizeof(*(ptr)));         \
})

#define cmpxchg_local(ptr, o, n)                    \
({                                  \
    __typeof__(*(ptr)) _o_ = (o);                   \
    __typeof__(*(ptr)) _n_ = (n);                   \
    (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
                      (unsigned long)_n_,       \
                      sizeof(*(ptr)));      \
})

#define cmpxchg64_local(ptr, o, n)                  \
({                                  \
    BUILD_BUG_ON(sizeof(*(ptr)) != 8);              \
    cmpxchg_local((ptr), (o), (n));                 \
})

#ifdef CONFIG_SMP
#undef __ASM__MB
#define __ASM__MB   "\tmb\n"
#endif
#undef ____xchg
#undef ____cmpxchg
#define ____xchg(type, args...)     __xchg ##type(args)
#define ____cmpxchg(type, args...)  __cmpxchg ##type(args)
#include <asm/xchg.h>

#define xchg(ptr, x)                            \
({                                  \
    __typeof__(*(ptr)) _x_ = (x);                   \
    (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_,      \
                 sizeof(*(ptr)));           \
})

#define cmpxchg(ptr, o, n)                      \
({                                  \
    __typeof__(*(ptr)) _o_ = (o);                   \
    __typeof__(*(ptr)) _n_ = (n);                   \
    (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,   \
                    (unsigned long)_n_, sizeof(*(ptr)));\
})

#define cmpxchg64(ptr, o, n)                        \
({                                  \
    BUILD_BUG_ON(sizeof(*(ptr)) != 8);              \
    cmpxchg((ptr), (o), (n));                   \
})

#undef __ASM__MB
#undef ____cmpxchg

#define __HAVE_ARCH_CMPXCHG 1

#endif /* _ALPHA_CMPXCHG_H */