__memset64
extern void *__memset64(uint64_t *, uint32_t first, __kernel_size_t, uint32_t second);
return __memset64(p, word.first, n * 8, word.second);
EXPORT_SYMBOL(__memset64);
extern void *__memset64(uint64_t *, uint64_t v, __kernel_size_t);
return __memset64(p, v, n * 8);
void *__memset64(uint64_t *s, uint64_t v, size_t count);
return __memset64(s, v, count * sizeof(v));