Release 4.18 arch/alpha/include/asm/cmpxchg.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ALPHA_CMPXCHG_H

#define _ALPHA_CMPXCHG_H

/*
 * Atomic exchange routines.
 */


#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));                                 \
})

#undef ____xchg
#undef ____cmpxchg

#define ____xchg(type, args...)		__xchg ##type(args)

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

/*
 * The leading and the trailing memory barriers guarantee that these
 * operations are fully ordered.
 */

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


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


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

#undef ____cmpxchg

#endif /* _ALPHA_CMPXCHG_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Paul Gortmaker
131
97.04%
1
33.33%
Andrea Parri
3
2.22%
1
33.33%
Greg Kroah-Hartman
1
0.74%
1
33.33%
Total
135
100.00%
3
100.00%
Directory: arch/alpha/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.