 
ATOMIC64_OPS(add, add)：
atomic64_addATOMIC64_OP(add, add) 
 
 
 
 
atomic64_add_returnATOMIC64_OP_RETURN(,dmb ish,,l,“memory”,add, add)
 
#define ATOMIC64_FETCH_OP(name, mb, acq, rel, cl, op, asm_op) \         
long atomic64_fetch_##op##name(long i, atomic64_t *v)         \
{                                                             \
long result, val;                                             \
unsigned long tmp;                                            \
                                                              \
    asm volatile("// atomic64_fetch_" #op #name "\n"          \
"   prfm    pstl1strm, %3\n"                                  \
"1: ld" #acq    "xr    %0, %3\n"                              \
"   "   #asm_op "     %1, %0, %4\n"                          \
"   st" #rel    "xr    %w2, %1, %3\n"                         \
"   cbnz    %w2, 1b\n"                                        \
"   " #mb                                                     \
: "=&r" (result), "=&r" (val), "=&r" (tmp), "+Q" (v->counter) \
: "Ir" (i)                                                    \
: cl);                                                        \
                                                              \
return result;                                                \
}
atomic64_add_return_relaxedATOMIC64_OP_RETURN(_relaxed,,,,,add, add)
atomic64_add_return_acquireATOMIC64_OP_RETURN(_acquire,,a,,“memory”,add, add)
atomic64_add_return_releaseATOMIC64_OP_RETURN(_release,,,l,“memory”,add, add)
atomic64_fetch_addATOMIC64_FETCH_OP(,dmb ish,,l,“memory”,add, add)
atomic64_fetch_add_relaxedATOMIC64_FETCH_OP(_relaxed,,,,,add, add)
atomic64_fetch_add_acquireATOMIC64_FETCH_OP(_acquire,,a,,“memory”,add, add)
atomic64_fetch_add_releaseATOMIC64_FETCH_OP(_release,,,l,“memory”,add, add)