cmpxchg.h File Reference

#include <linux/bug.h>
#include <linux/irqflags.h>
#include <asm/war.h>
#include <asm-generic/cmpxchg-local.h>

Go to the source code of this file.

Macros
#define	__xchg_u64   __xchg_u64_unsupported_on_32bit_kernels
#define	xchg(ptr, x)
#define	__HAVE_ARCH_CMPXCHG   1
#define	__cmpxchg_asm(ld, st, m, old, new)
#define	__cmpxchg(ptr, old, new, pre_barrier, post_barrier)
#define	cmpxchg(ptr, old, new)   __cmpxchg(ptr, old, new, smp_mb__before_llsc(), smp_llsc_mb())
#define	cmpxchg_local(ptr, old, new)   __cmpxchg(ptr, old, new, , )
#define	cmpxchg64(ptr, o, n)
#define	cmpxchg64_local(ptr, o, n)   __cmpxchg64_local_generic((ptr), (o), (n))

Functions
__u64	__xchg_u64_unsupported_on_32bit_kernels (volatile __u64 *m, __u64 val)
void	__cmpxchg_called_with_bad_pointer (void)

Macro Definition Documentation

#define __cmpxchg	(		ptr,
			old,
			new,
			pre_barrier,
			post_barrier
	)

Value:

({                                  \
    __typeof__(ptr) __ptr = (ptr);                  \
    __typeof__(*(ptr)) __old = (old);               \
    __typeof__(*(ptr)) __new = (new);               \
    __typeof__(*(ptr)) __res = 0;                   \
                                    \
    pre_barrier;                            \
                                    \
    switch (sizeof(*(__ptr))) {                 \
    case 4:                             \
        __res = __cmpxchg_asm("ll", "sc", __ptr, __old, __new); \
        break;                          \
    case 8:                             \
        if (sizeof(long) == 8) {                \
            __res = __cmpxchg_asm("lld", "scd", __ptr,  \
                       __old, __new);       \
            break;                      \
        }                           \
    default:                            \
        __cmpxchg_called_with_bad_pointer();            \
        break;                          \
    }                               \
                                    \
    post_barrier;                           \
                                    \
    __res;                              \
})

Definition at line 197 of file cmpxchg.h.

#define __cmpxchg_asm	(		ld,
			st,
			m,
			old,
			new
	)

Definition at line 140 of file cmpxchg.h.

#define __HAVE_ARCH_CMPXCHG   1

Definition at line 138 of file cmpxchg.h.

#define __xchg_u64   __xchg_u64_unsupported_on_32bit_kernels

Definition at line 115 of file cmpxchg.h.

#define cmpxchg	(		ptr,
			old,
			new
	)		__cmpxchg(ptr, old, new, smp_mb__before_llsc(), smp_llsc_mb())

Definition at line 226 of file cmpxchg.h.

#define cmpxchg64	(		ptr,
			o,
			n
	)

Value:

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

Definition at line 229 of file cmpxchg.h.

#define cmpxchg64_local	(		ptr,
			o,
			n
	)		__cmpxchg64_local_generic((ptr), (o), (n))

Definition at line 243 of file cmpxchg.h.

#define cmpxchg_local	(		ptr,
			old,
			new
	)		__cmpxchg(ptr, old, new, , )

Definition at line 227 of file cmpxchg.h.

#define xchg	(		ptr,
			x
	)

Value:

({                                  \
    BUILD_BUG_ON(sizeof(*(ptr)) & ~0xc);                \
                                    \
    ((__typeof__(*(ptr)))                       \
        __xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))); \
})

Definition at line 130 of file cmpxchg.h.

Function Documentation

void __cmpxchg_called_with_bad_pointer

(

void

)

__u64 __xchg_u64_unsupported_on_32bit_kernels	(	volatile __u64 *	m,
		__u64	val
	)