The number of readahead arguments depends on architecture and personality. For 64bit and ilp32 it equals to 3, for unaligned 32bit it equals to 4, and for aligned 32bit it equals to 5. * linux/aarch64/syscallent1.h: Set number of readahead arguments to 3. * linux/alpha/syscallent.h: Likewise. * linux/ia64/syscallent.h: Likewise. * linux/s390x/syscallent.h: Likewise. * linux/sh64/syscallent.h: Likewise. * linux/x32/syscallent.h: Likewise. * linux/x86_64/syscallent.h: Likewise. * linux/or1k/syscallent.h: Set number of readahead arguments to 4. * linux/sh/syscallent.h: Likewise. * linux/tile/syscallent.h: Likewise. * linux/xtensa/syscallent.h: Set number of readahead arguments to 5.