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diff between 2.4.21pre2aa2 and 2.4.21pre3aa1:

Only in 2.4.21pre2aa2: 00_apm-do_read-1
Only in 2.4.21pre2aa2: 20_apm-o1-sched-1
Only in 2.4.21pre2aa2: 9970_corename-2.gz

Merged in mainline.

Only in 2.4.21pre2aa2: 00_extraversion-15
Only in 2.4.21pre3aa1: 00_extraversion-16
Only in 2.4.21pre2aa2: 00_sched-O1-aa-2.4.19rc3-7.gz
Only in 2.4.21pre3aa1: 00_sched-O1-aa-2.4.19rc3-8.gz
Only in 2.4.21pre2aa2: 10_o_direct-open-check-2
Only in 2.4.21pre3aa1: 10_o_direct-open-check-3
Only in 2.4.21pre2aa2: 30_09_o_direct-1
Only in 2.4.21pre3aa1: 30_09_o_direct-2
Only in 2.4.21pre2aa2: 70_xfs-sysctl-1
Only in 2.4.21pre3aa1: 70_xfs-sysctl-2
Only in 2.4.21pre3aa1: 9910_shm-largepage-10.gz
Only in 2.4.21pre2aa2: 9910_shm-largepage-9.gz


Only in 2.4.21pre3aa1: 00_o_direct-align-1

Fix alignment check.

Only in 2.4.21pre3aa1: 00_one_highpage_init-cleanup-1

Cleanup from J.A. Magallon backported from 2.5.

Only in 2.4.21pre2aa2: 00_semop-timeout-1
Only in 2.4.21pre3aa1: 00_semop-timeout-2

Add ia32 emulation of the syscall to ia64 (forwarded by Andrew).

Only in 2.4.21pre3aa1: 00_vmalloc-ltp-crash-1

Fix oops with ltp (still log, doesn't need to be rate limited
since it's a privilegied call and printing it is useful
for debugging but it doesn't crash).

Only in 2.4.21pre3aa1: 05_vm_22_vm-anon-lru-1

SMP scalability feature that increase performance of 20% on some
16-way. VM will be less aware when it's time to start swapping, this
may be even better for some DB workload, but it could be a little worse
for very small boxes. The first seconds of swap could be less smooth.
If you want the VM to always have visibility of anon pages just set
this sysctl to 1: /proc/sys/vm/vm_anon_lru. Default is set to zero.
After the first swapouts the anon pages will be left into the lru and
the behaviour will be equivalent to vm_anon_lru set to 1.

Only in 2.4.21pre3aa1: 05_vm_23_per-cpu-pages-1

Add per-cpu-pages in front of the allocator, this brings several dozen
points percent to some 16-way too, this along with the vm-anon-lru
drops all the global locks in the anonymous memory allocation page fault
fast path, and if applied together they nearly doubles performance of
very parallel SMP workloads.

This patch is based on the original code from Ingo Molnar but the
refill/allocation decisions are quite different, and this as well is
made to work fine with the per-point-of-view watermarks.

Only in 2.4.21pre2aa2: 10_rawio-vary-io-16
Only in 2.4.21pre3aa1: 10_rawio-vary-io-17

Add some exports for modules needing these functionalities.

Only in 2.4.21pre2aa2: 93_NUMAQ-8
Only in 2.4.21pre3aa1: 93_NUMAQ-9

Should fix compilation (reported by William Lee Irwin III)

Only in 2.4.21pre2aa2: 9985_blk-atomic-aa4
Only in 2.4.21pre3aa1: 9985_blk-atomic-aa5

Remeber to start with blk_elv_seq set to 0 by default (or it can
hang with synchronous-rawio followed by async-io-rawio).

Only in 2.4.21pre3aa1: 9995_frlock-gettimeofday-1

Added patch from Stephen Hemminger that uses the two sequence
numbers to bring total SMP scalability to gettimeofday and
implements a frlock framework that can replace read/write locks.
This way the fr_write_lock is also fair, and it cannot get starved
by the readers (unlike the plain read_lock where we depend on the
unfariness to avoid clearing irq in the readers if the writes will
never run from irqs). Avoiding starvation of writes make sure not to
lose timer ticks (and in turn system time), in particular on numa or
big smp. The locking design is the same of the one implemented in the
x86-64 vsyscalls, except here the reader is still in kernel so it's
still some order of magnitude slower than x86-64, but at least the smp
scalability is total and the starvation is gone. This also includes a
critical race fix from me to make the code stable, and some porting
work from Andreas Schwab.

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