extern void _lib_ring_buffer_strcpy(struct lib_ring_buffer_backend *bufb,
size_t offset, const char *src, size_t len,
size_t pagecpy, int pad);
extern void _lib_ring_buffer_copy_from_user_inatomic(struct lib_ring_buffer_backend *bufb,
size_t offset, const void *src,
extern void _lib_ring_buffer_strcpy(struct lib_ring_buffer_backend *bufb,
size_t offset, const char *src, size_t len,
size_t pagecpy, int pad);
extern void _lib_ring_buffer_copy_from_user_inatomic(struct lib_ring_buffer_backend *bufb,
size_t offset, const void *src,