glibc/sysdeps/unix/sysv/linux/mips/mmap_info.h

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/* mips64n32 uses __NR_mmap for mmap64 while still having sizeof (off_t)
smaller than sizeof (off64_t). So it allows mapping large offsets
using mmap64 than 32-bit archs which uses __NR_mmap2. */
static inline uint64_t
mmap64_maximum_offset (long int page_shift)
{
#if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
return UINT64_MAX;
#else
return (UINT64_C(1) << (page_shift + (8 * sizeof (off_t)))) - 1;
#endif
}