This fixes the emacs bug reported by Andries.  It should probably also
fix other, terminal handling related weirdnesses introduced by the new
PID handling code in 2.5.38.

The bug was in the session_of_pgrp() function, if no proper session is
found in the process group then we must take the session ID from the
process that has pgrp PID (which does not necesserily have to be part of
the pgrp).  The fallback code is only triggered when no process in the
process group has a valid session - besides being faster, this also
matches the old implementation.

[ hey, who needs a POSIX conformance testsuite when we have emacs! ;) ]

The direct-IO code is currently generating 1 meg BIOs (and
subsequent BUGs) because it doesn't know about bio_add_page().

Could we please drop it to 16k until we get it sorted out?

into kroah.com:/home/greg/linux/BK/gregkh-2.5

-increased timeout value because some people reported problems
-(important!) Vender ID has changed from 0x1212 to 0x10D2 , my official
  assigned one.
-added usblcd driver to configure.help

Update to full working driver status. Latest firmware 4.06 too. Driver
now officially supported.

Based off of a patch from Stuart MacDonald <stuartm@connecttech.com>

This cleans up the error path in the open() call to make a bit more
sense.

This fixes a stupid error in the timeout value when downloading firmware
to a device.  The WhiteHEAT device now works properly with this patch.

Like the header says, this patch fixes up the various Transfer- and
Transport-level return codes.  There were a lot of places in the various
subdrivers that were not particularly careful about distinguishing the
two; it would help if the people currently maintaining those drivers could
take a look at my changes to make sure I haven't screwed anything up.

# Converted US_BULK_TRANSFER_xxx to USB_STOR_XFER_xxx, to make it more
# easily distinguishable from USB_STOR_TRANSPORT_xxx.  (Also, in the
# future these codes may apply to control transfers as well as to bulk
# transfers.)
#
# Changed USB_STOR_XFER_FAILED to USB_STOR_XFER_ERROR, since it implies
# a transport error rather than a transport failure.
#
# Added a USB_STOR_XFER_STALLED code, to indicate a transfer that was
# terminated by an endpoint stall.

This patch is in preparation for one in which usb_stor_transfer_partial()
and usb_stor_transfer() are replaced by usb_stor_bulk_transfer_buf() and
usb_stor_bulk_transfer_srb() respectively, with slightly different
argument lists.  Ultimately the subdrivers will be able to use these
routines in place of the slightly specialized versions they have now and
in place of the ones in raw_bulk.c.

compile fails with the following message:

	> In file included from ohci-hcd.c:136:
	> ohci-dbg.c:318: parse error
	> make[3]: *** [ohci-hcd.o] Error 1

due to a missing #include <linux/version.h>

Here is a trivial patch for this.

is it guarenteed that callers have zero'd out the device
before this is invoked?  Else the following is necessary to
prevent potential OOPS's derefencing interface->dev.driver in
the generic device layer.

Here's an EHCI update, I'll send separate patches to sync 2.4 with
this version.  Changes in this version include:

  - An earlier locking update would give trouble on SPARC, where
    irqsave "flags" aren't flags.  This resolves that issue by
    adding a module parameter to limit work done with irqs off.
    (Some net drivers do the same thing.)

  - Optionally (now #ifdef DEBUG) collects some statistics on IRQs
    and URBs.  There are more IAA interrupts than I want to see,
    during extended usb-storage loading.

  - Adds a commented-out workaround for a problem I've seen on one
    VT8235.  Seems likely an issue with this specific motherboard;
    another tester hasn't reported such issues.

  - Includes the jiffies time_after() patch from Tim Schmielau.

  - Minor tweaks to the hcd portability (get rid of another #if).

  - Minor doc/diagnostic/... updates

This USB patch updates the OHCI driver:

  - converts to relying on td_list shadowing the hardware's
    schedule; only collecting the donelist needs dma_to_td(),
    and td list handling works much like EHCI or UHCI.

  - leaves faulted endpoint queues (bulk/intr) disabled until
    the relevant drivers had a chance to clean up.

  - fixes minor bugs (unreported) in the affected code:
      * byteswap problem when unlinking urbs ... symptom would
        be data toggle confusion (since 2.4.2x) on big-endian cpus
      * latent bug if folk unlinked queue in LIFO order, not FIFO

  - removes unnecessary debug code; mostly de-BUG()ged

The interesting fix is the "leave queues halted" one.  As
discussed on email a while back, this HCD fault handling
policy (also followed by EHCI) is sufficient to let device
drivers implement the two key fault handling policies that
seem to be necessary:

    (a) Datagram style, where issues on one I/O won't affect
        the next unless the device halted the endpoint.  The
        device driver can ignore most errors other than -EPIPE.

    (b) Stream style, where for example it'd be wrong to ever
        let block N+1 overwrite block N on the disk.  Once
        the first URB fails, the rest would just be unlinked
        in the completion handler.

As a consequence of using the td_list, you can now see urb
queuing in action in the driverfs 'async' file.  At least, if
you look at the right time, or use drivers (networking, etc)
that queue (bulk) reads for a long time.

This fixes all xchg()'s and a preemption bug.

This does the following things:

 - removes the ->thread_group list and uses a new PIDTYPE_TGID pid class
   to handle thread groups. This cleans up lots of code in signal.c and
   elsewhere.

 - fixes sys_execve() if a non-leader thread calls it. (2.5.38 crashed in
   this case.)

 - renames list_for_each_noprefetch to __list_for_each.

 - cleans up delayed-leader parent notification.

 - introduces link_pid() to optimize PIDTYPE_TGID installation in the
   thread-group case.

I've tested the patch with a number of threaded and non-threaded
workloads, and it works just fine. Compiles & boots on UP and SMP x86.

The session/pgrp bugs reported to lkml are probably still open, they are
the next on my todo - now that we have a clean pidhash architecture they
should be easier to fix.

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

T30_s * is part of a union, so the typedef needs to exist even when
CONFIG_ISDN_TTY_FAX is not set.

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

When converting all L_TARGETs to lib.a, I missed these instances.

Update alpha port to work with new nanosecond xtime, and the in_atomic()
requirements.

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

The problem is that the local APIC code references stuff in
mpparse, but 2.5.37 changed arch/i386/kernel/Makefile to only
compile mpparse for SMP.

This patch works around this by enforcing CONFIG_X86_MPPARSE
for all LOCAL_APIC-enabled configs.

Add bio_get_nr_vecs(). It returns an approximate number of pages that
can be added to a block device. It's just a ballpark number, but I think
this is quite fine for the type of thing it is needed for: mpage etc
need to know an approx size of a bio that they need to allocate. It
would be silly to continously allocate 64-page sized bio_vec entries, if
the target cannot do more than 8, for example.

make pdc4030 work

Bad merge from 2.4.20-pre-ac, ide_build_dmatable() does not need data
direction argument in 2.5 (it's implicit in the request)

I'm terribly sorry - I've sent you the wrong diff, it was
some intermediate variant. Actually it added extra breakage to
ide_hwif_configure().

Desired behavior was:

if ctl == base == 0, the device is in "true legacy" mode (as per PCI
spec); use values from the base address registers otherwise.

cleanup end_that_request_first() end_io handling, and fix bug where
partial completes didn't get accounted right wrt blk_recalc_rq_sectors()

into tp1.ruhr-uni-bochum.de:/home/kai/kernel/v2.5/linux-2.5.isdn

It was (only partially) protected by cli() before, which we want to
get rid of.

Simplifies the code which was previously using an open coded
singly linked list.

Also, deleting a phone number during dial-out could easily oops
the kernel before this patch.

ISDN_GLOBAL_STOPPED is a way to globally stop the system
from dialing out / accepting incoming calls. Instead of
spreading checks all over the place, just catch dial
commands / incoming call indications in one place.

Also, kill isdn_net_phone typedef and clean up affected code.

It's not used for the timeout controlled hangup anymore, only to
hangup depending on the dialmode, which we handle directly now.

o PPP_IPX is defined in a header these days
o isdn_net_hangup takes an isdn_net_local *, simplifying
  code a bit.

into tp1.ruhr-uni-bochum.de:/home/kai/kernel/v2.5/linux-2.5.make

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

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

Convert the VM to not wait on other people's dirty data.

 - If we find a dirty page and its queue is not congested, do some writeback.

 - If we find a dirty page and its queue _is_ congested then just
   refile the page.

 - If we find a PageWriteback page then just refile the page.

 - There is additional throttling for write(2) callers.  Within
   generic_file_write(), record their backing queue in ->current.
   Within page reclaim, if this tasks encounters a page which is dirty
   or under writeback onthis queue, block on it.  This gives some more
   writer throttling and reduces the page refiling frequency.

It's somewhat CPU expensive - under really heavy load we only get a 50%
reclaim rate in pages coming off the tail of the LRU.  This can be
fixed by splitting the inactive list into reclaimable and
non-reclaimable lists.  But the CPU load isn't too bad, and latency is
much, much more important in these situations.

Example: with `mem=512m', running 4 instances of `dbench 100', 2.5.34
took 35 minutes to compile a kernel.  With this patch, it took three
minutes, 45 seconds.

I haven't done swapcache or MAP_SHARED pages yet.  If there's tons of
dirty swapcache or mmap data around we still stall heavily in page
reclaim.  That's less important.

This patch also has a tweak for swapless machines: don't even bother
bringing anon pages onto the inactive list if there is no swap online.

The key concept here is that pdflush does not block on request queues
any more.  Instead, it circulates across the queues, keeping any
non-congested queues full of write data.  When all queues are full,
pdflush takes a nap, to be woken when *any* queue exits write
congestion.

This code can keep sixty spindles saturated - we've never been able to
do that before.

 - Add the `nonblocking' flag to struct writeback_control, and teach
   the writeback paths to honour it.

 - Add the `encountered_congestion' flag to struct writeback_control
   and teach the writeback paths to set it.

So as soon as a mapping's backing_dev_info indicates that it is getting
congested, bale out of writeback.  And don't even start writeback
against filesystems whose queues are congested.

 - Convert pdflush's background_writeback() function to use
   nonblocking writeback.

This way, a single pdflush thread will circulate around all the
dirty queues, keeping them filled.

 - Convert the pdlfush `kupdate' function to do the same thing.

This solves the problem of pdflush thread pool exhaustion.

It solves the problem of pdflush startup latency.

It solves the (minor) problem wherein `kupdate' writeback only writes
back a single disk at a time (it was getting blocked on each queue in
turn).

It probably means that we only ever need a single pdflush thread.