Make sure that the VC tty pointer is cleared when the tty is free'd.

into home.transmeta.com:/home/torvalds/v2.5/linux

into samba.org:/scratch/anton/linux-2.5_ppc64drivers

into home.transmeta.com:/home/torvalds/v2.5/linux

into groveronline.com:/root/bk/linux-acpi

into groveronline.com:/root/bk/linux-acpi

into hostme.bitkeeper.com:/ua/repos/l/linux-acpi/linux-acpi

into home.transmeta.com:/home/torvalds/v2.5/linux

bit of cleaning later.

a bit later

Note: I've also fixed several obvious "forgot to update" problems (changed
prototype of blk_init_queue(), etc.) but I hadn't touched the DMA-mapping
stuff, so it still doesn't work with 2.5; moreover, it misses a lot of fixes
done in 2.4, but that's fun for Alan - he's the maintainer

into samba.org:/scratch/anton/linux-2.5_work

into samba.org:/scratch/anton/linux-2.5_work

into samba.org:/scratch/anton/linux-2.5_work

Well I didn't test that very well.  __page_cache_release() is doing a
__free_page() on a zero-ref page, so __free_pages() sends the refcount
negative and doesn't free it.  With patch #8, page_cache_release()
almost never frees pages, but it must have been leaking a little bit.
Lucky it showed up.

This fixes it, and also adds a missing PageReserved test in put_page().
Which makes put_page() identical to page_cache_release(), but there are
header file woes.  I'll fix that up later.

This trivial patch reorders the unlocking in rq_unlock()... I was
tired of getting stack dumps in my messages file.

isn't ready for it (either during early boot, or at shutdown)

into home.transmeta.com:/home/torvalds/v2.5/linux