seems someone else was faster fixing the hardsects problem in the xpram
driver.  We continued with my new version of the xpram driver.  Arnd
Bergmann found some bugs and added support for the driverfs.

The dasd driver as a module needs to call elevator_init/elavator_exit to
change the elevator algorithm to elevator_noop.

1) Replace is_read_only with bdev_read_only. The last user of is_read_only
   is gone...
2) Remove alloc & free of the label array in dasd_genhd. This is needed for
   the label array extension but this is a patch of its own.
3) Maintain the old behaviour of /proc/dasd/devices. Its is possible again
   to use "add <devno>" instead of "add device <devno>" or "add range=<devno>".

1) Add __s390__ to the list of architectures that use unsigned int as
   type for rautofs_wqt_t. __s390__ is defined for both 31-bit and 64-bit
   linux for s/390. Both architectures are fine with unsigned int since
   sizeof(unsigned int) == sizeof(unsigned long) for 31 bit s/390.
2) Remove early initialization call ccwcache_init(). It doesn't exists
   anymore.
3) Remove special case for irq_stat. We moved the irq_stat structure out
   of the lowcore.
4) Replace acquire_console_sem with down_trylock & return to avoid an
   endless trap loop if console_unblank is called from interrupt context
   and the console semaphore is taken.

some recent changes in the s390 architectures files:
1) Makefile fixes.
2) Add missing include statements.
3) Convert all parametes in the 31 bit emulation wrapper of sys_futex.
4) Remove semicolons after 'fi' in Config.in
5) Fix scheduler defines in system.h
6) Simplifications in qdio.c

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

Pure luck that this ever worked at all. The optimized assembly for XOR
in RAID-5 declared did clobber registers, but did declare them as read-only.
I'm pretty sure that at least the 4 disk and possibly the 5 disk cases
did corrupt callee saved registers. The others probably got away because
they were always used in own functions (and only clobbering caller saved
registers)and only called via pointers, preventing inlining.

Some of the replacements are a bit complicated because the functions
exceed gcc's 10 asm argument limit when each input/output register needs
two arguments. Works around that by saving/restoring some of the registers
manually.

I wasn't able to test it in real-life because I don't have a RAID
setup and the RAID code didn't compile since several 2.5 releases.
I wrote some test programs that did test the XOR and they showed
no regression.

Also aligns to XMM save area to 16 bytes to save a few cycles.

This renames 'xqm.h' to a bit better (more consistent with rest of
sources) name.

Patch to reorder the APIC configuration so that dependencies are
determined beforehand for MCE. Keith Owens pointed this out a whiles back
actually.

It seems func.h needs to inlude linux/kdev_t.h:

For some odd reason, the blkdev.h changes did not get patched into your
tree from the patch I sent?! Anyways, here's that change:

This patch fixes the following problems in the file lease:
	when there are multiple shared leases on a file, all the
		lease holders get notified when someone opens the
		file for writing (used to be only the first).
	when a nonblocking open breaks a lease, it will time out
		as it should (used to never time out).

This should make the leases code more usable (hopefully).

This patch makes copy_siginfo_to_user excplicitly copy the correct
union member.  Previously we were getting the correct result but
really by accident.

I needed these to make 2.5.22 build for me.

arch/ppc64/kernel/sys_ppc32.c has a getname32 function.  The only
difference between it and getname() is that it calls do_getname32()
instead of do_getname() (see fs/namei.c).  The difference between
do_getname and do_getname32 is that the former checks to make sure that
the pointer it is passed is less that TASK_SIZE and restricts the length
copied to the lesser of PATH_MAX and (TASK_SIZE - pointer).
do_getname32 uses PAGE_SIZE instead of PATH_MAX.

Anton Blanchard says it is OK to remove getname32.

arch/ia64/ia32/sys_ia32.c defined a getname32(), but nothing used it.

This patch removes both.

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

  without making sure that the target CPU is allowed.

  the current implementation does the following to 'give up' the CPU:

   - it decreases its priority by 1 until it reaches the lowest level
   - it queues the task to the end of the priority queue

  this scheme works fine in most cases, but if sched_yield()-active tasks
  are mixed with CPU-using processes then it's quite likely that the
  CPU-using process is in the expired array. In that case the yield()-ing
  process only requeues itself in the active array - a true context-switch
  to the expired process will only occur once the timeslice of the
  yield()-ing process has expired: in ~150 msecs. This leads to the
  yield()-ing and CPU-using process to use up rougly the same amount of
  CPU-time, which is arguably deficient.

  i've fixed this problem by extending sched_yield() the following way:

  +        * There are three levels of how a yielding task will give up
  +        * the current CPU:
  +        *
  +        *  #1 - it decreases its priority by one. This priority loss is
  +        *       temporary, it's recovered once the current timeslice
  +        *       expires.
  +        *
  +        *  #2 - once it has reached the lowest priority level,
  +        *       it will give up timeslices one by one. (We do not
  +        *       want to give them up all at once, it's gradual,
  +        *       to protect the casual yield()er.)
  +        *
  +        *  #3 - once all timeslices are gone we put the process into
  +        *       the expired array.
  +        *
  +        *  (special rule: RT tasks do not lose any priority, they just
  +        *  roundrobin on their current priority level.)
  +        */

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

This patch (against 2.5.22) removes the BKL from around the call
to i_op->permission() in fs/namei.c, and pushes the BKL into those
filesystems that have permission() methods that require it.

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

This contains the following changes to the SCSI tape driver:

- one buffer is used for each tape (no buffer pool)
- buffers allocated when needed and freed when device closed
- common code from read and write moved to a function
- default maximum number of scatter/gather segments increased to 64
- tape status set to "no tape" after succesful unload

Nobody's using it any more, kill:

This is actually part of the work I've been doing to remove BHs, but it
stands by itself.

This patch streamlines poll and select by adding fast paths for a
small number of descriptors passed. The majority of polls/selects
seem to be of this nature. The main saving comes from not allocating
two pages for wait queue and table, but from using stack allocation
(upto 256bytes) when only a few descriptors are needed. This makes
it as fast again as 2.0 and even a bit faster because the wait queue
page allocation is avoided too (except when the drivers overflow it)

select also skips a lot faster over big holes and avoids the separate
pass of determining the max. number of descriptors in the bitmap.

A typical linux system saves a considerable amount of unswappable memory
with this patch, because it usually has 10+ daemons hanging around in poll or
select with each two pages allocated for data and wait queue.

Some other cleanups.

x86-64 needs an own special declaration of jiffies_64.

prepare for this by moving the jiffies_64 declaration from
kernel/timer.c down into each architecture.

x86_64 core updates.

 - Make it compile again (switch_to macros etc., add dummy suspend.h)
 - reenable strength reduce optimization
 - Fix ramdisk (patch from Mikael Pettersson)
 - Some merges from i386
 - Reimplement lazy iobitmap allocation.  I reimplemented it based
   on bcrl's idea.
 - Fix IPC 32bit emulation to actually work and move into own file
 - New fixed mtrr.c from DaveJ ported from 2.4 and reenable it.
 - Move tlbstate into PDA.
 - Add some changes that got lost during the last merge.
 - new memset that seems to actually work.
 - Align signal handler stack frames to 16 bytes.
 - Some more minor bugfixes.

Heaven knows why, but that's what the opengroup say, and returning
-EFAULT causes 2.5 to fail one of the Linux Test Project tests.

[ENOMEM]
          The addresses in the range starting at addr and continuing
          for len bytes are outside the range allowed for the address
          space of a process or specify one or more pages that are not
          mapped.

2.4 has it right, but 2.5 doesn't.

Reduce the radix tree nodes from 128 slots to 64.

- The main reason for this is that on 64-bit/4k page machines, the
  slab allocator has decided that radix tree nodes will require an
  order-1 allocation.  Shrinking the nodes to 64 slots pulls that back
  to an order-0 allocation.

- On x86 we get fifteen 64-slot nodes per page rather than seven
  129-slot nodes, for a modest memory saving.

- Halving the node size will approximately halve the memory use in
  the worrisome really-large, really-sparse file case.

Of course, the downside is longer tree walks.  Each level of the tree
covers six bits of pagecache index rather than seven.  As ever, I am
guided by Anton's profiling on the 12- and 32-way PPC boxes.
radix_tree_lookup() is currently down in the noise floor.

Now, there is one special case: one file which is really big and which
is accessed in a random manner and which is accessed very heavily: the
blockdev mapping.  We _are_ showing some locking cost in
__find_get_block (used to be __get_hash_table) and in its call to
find_get_page().  I have a bunch of patches which introduce a generic
per-cpu buffer LRU, and which remove ext2's private bitmap buffer LRUs.
I expect these patches to wipe the blockdev mapping lookup lock contention
off the map,  but I'm awaiting test results from Anton before deciding
whether those patches are worth submitting.

Renames the buffer_head lookup function `get_hash_table' to
`find_get_block'.

get_hash_table() is too generic a name. Plus it doesn't even use a hash
any more.

One weakness which was introduced when the buffer LRU went away was
that GFP_NOFS allocations became equivalent to GFP_NOIO.  Because all
writeback goes via writepage/writepages, which requires entry into the
filesystem.

However now that swapout no longer calls bmap(), we can honour
GFP_NOFS's intent for swapcache pages.  So if the allocation request
specifies __GFP_IO and !__GFP_FS, we can wait on swapcache pages and we
can perform swapcache writeout.

This should strengthen the VM somewhat.

The set_page_buffers() and clear_page_buffers() macros are each used in
only one place.  Fold them into their callers.

highmem.h includes bio.h, so just about every compilation unit in the
kernel gets to process bio.h.

The patch moves the BIO-related functions out of highmem.h and into
bio-related headers.  The nested include is removed and all files which
need to include bio.h now do so.

alloc_bufer_head() does not need the additional argument - GFP_NOFS is
always correct.

Clean up ext3's journal_try_to_free_buffers().  Now that the
releasepage() a_op is non-blocking and need not perform I/O, this
function becomes much simpler.

bio_copy is doing

	vfrom = kmap_atomic(bv->bv_page, KM_BIO_IRQ);
	vto = kmap_atomic(bbv->bv_page, KM_BIO_IRQ);

which, if I understand atomic kmaps, is incorrect.  Both source and
dest will get the same pte.

The patch creates a separate atomic kmap member for the destination and
source of this copy.