/usr/arm-linux-gnueabihf/include/asm/mman.h is in linux-libc-dev-armhf-cross 4.4.0-18.34cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #include <asm-generic/mman.h>
#define arch_mmap_check(addr, len, flags) \
(((flags) & MAP_FIXED && (addr) < FIRST_USER_ADDRESS) ? -EINVAL : 0)
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