PAGE_RESERVED_HEADER_SIZE  265 maint/gnulib/lib/immutable.c # define PAGE_RESERVED_HEADER_SIZE SHARED_LINK_HEADER_SIZE
PAGE_RESERVED_HEADER_SIZE  138 maint/gnulib/tests/test-ssfmalloc.c #define PAGE_RESERVED_HEADER_SIZE (3 * UINTPTR_WIDTH / 8) /* = 3 * sizeof (void *) */