[PATCH] latest radix-tree pagecache patch and 2.4.19-pre3-ac6

[Art Haas <ahaas@neosoft.com>]

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Hi.

I've managed to cobble together a patch which takes the latest
radix-tree code and makes it "work" with the rmap code in
2.4.19-pre3-ac6. I'm running the kernel with this patch right
now, and I've got KDE, Konqueror, and Xemacs running, and things
look good. I'm usually using swap space at this point, but with
the patch I'm not yet doing so. Maybe this is part of the
benefits of the patch, or maybe I've screwed things up
but haven't yet tripped. I'd be grateful for a second or
third pair of eyes to look over this, to see if what
I've got looks reasonable. If it does, I'll send it out
the the kernel mailing list.

The original radix-tree patch applies fairly cleanly to the
-ac6 tree, but there are a few files that need touching up. The
mm/vmscan.c, mm/filemap.c, and mm/shmem.c files needed the
most attention. For vmscan.c, a couple of pieces in the original
patch were dropped, as it looks like they'll only apply (or
make sense) with the non-rmap code. As for filemap.c, a few
changes seemed to conflict with the rmap code, so my efforts
to make a compilable file may have broken the code. But hey,
I got a `.o' file from the compiler, so it must work, right? :-)

My thanks to everyone working on the VM code, and the radix-tree
patches. Comments (and fixes) welcomed.

-- 
They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety.
 -- Benjamin Franklin, Historical Review of Pennsylvania, 1759

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