_MAX_PAGE_SHIFT
#define PTHREAD_STACK_MIN (1U << _MAX_PAGE_SHIFT)
#define PAGESIZE (1UL << _MAX_PAGE_SHIFT)
#define PRINTF_PAGESIZE (1 << _MAX_PAGE_SHIFT)
#define MALLOC_PAGESHIFT _MAX_PAGE_SHIFT
#define MALLOC_PAGESHIFT _MAX_PAGE_SHIFT
(((x) + ((1 << _MAX_PAGE_SHIFT) - 1)) & ~((1 << _MAX_PAGE_SHIFT) - 1))
#define PAGESIZE (1ULL << _MAX_PAGE_SHIFT)
#define SHMLBA (1U << _MAX_PAGE_SHIFT)
#define MINSIGSTKSZ (3U << _MAX_PAGE_SHIFT) /* minimum allowable stack */
#if _MAX_PAGE_SHIFT < 14 /* recommended stack size */
#define SIGSTKSZ (MINSIGSTKSZ + (1U << _MAX_PAGE_SHIFT) * 4)
#define SIGSTKSZ (MINSIGSTKSZ + (1U << _MAX_PAGE_SHIFT) * 2)