* sysdeps/unix/sysv/linux/mips/bits/mman.h (MS_SYNC): 0 will not work - set to 4 in accordance with changes made in the Linux/MIPS kernel. Using MS_SYNC on older kernels with MS_SYNC == 0 doesn't actually work.
* sysdeps/unix/sysv/linux/mips/bits/mman.h: Use correct values for the defines.