It contains a very small number of changes, mostly an x86_64 update.
Side note: I'm planning on moving the v2.4 repository along with the full
history information to a git repository soon.
Summary of changes from v2.4.30 to v2.4.31-pre1
o MAINTAINERS: remove obsolete ACP/MWAVE MODEM entry
o x86_64: Handle MM going away in context switch
o x86_64: Backport 2.6 MTRR algorithms
o x86_64: noexec=off never worked correctly for the kernel direct mappings
o x86_64: Fix idle=poll
o x86_64: Fix reference counting bug in change_page_attr on i386/x86-64
o x86_64: Resend lost APIC IRQs on Uniprocessor too
o x86_64: Avoid a obnoxious warning during build
o x86_64: Flush correctly when more than one page is getting flushed
o x86_64: Reload init_mm on leaving lazy mm
o rwsem: Make rwsems use interrupt disabling spinlocks
o [NETLINK]: Fix sk_rmem_alloc assertion failure in af_netlink.c