1) Problem with current->state in serport_ldisc_read.
    	   Solved by using wait_event_interruptible()
    	2) Problem when serport_ldisc_read() is entered twice.
    	   Solved using set_bit et al.
    	3) Complex naming of the serio ports.
    	   Using tty_name() instead.
    	4) Possible stack overflows in name generations.
    	   Using tty_name() instead. 

partitions. The higher layers do a better job of it.

sk_inuse should be bigger than "char" as we can
have more than 255 server threads.  Due to the way the count
is used, this is unlikely to actually cause a problem, but it
should nonetheless be fixed.

Also, two printk generate more noise than we would like,
so turn them into dprintk (debugging printk).

sock_writeable determines whether there is space in a socket's output
buffer.  socket write_space callbacks use it to determine whether to wake
up those that are waiting for more output buffer space.

however, sock_writeable is not appropriate for TCP sockets.  because the
RPC layer's write_space callback uses it for TCP sockets, the RPC layer
hammers on sock_sendmsg with dozens of write requests that are only a few
hundred bytes long when it is trying to send a large write RPC request.
this patch adds logic to the RPC layer's write_space callback that
properly handles TCP sockets.

patch reviewed by Trond and Alexey.

when several RPC requests want to reconnect a TCP transport socket at
once, xprt_lock_write serializes the tasks to prevent multiple socket
connects.  however, TCP connects are always done by a RPC child task that
has no request slot.  xprt_lock_write can oops if there is no request slot
allocated to the invoking RPC task.  reviewed and accepted by Trond.

the xprt_lock_write changes are not yet in 2.4, so this patch does not
apply to 2.4.

This fixes a bad TLS initialization bug found by Andi Kleen.  x86/SMP
only worked due to luck.

This adds two scheduler related fixes:

 - changes the migration code to use struct completion. Andrew pointed out
   that there might be a small window in where the up() touches the
   semaphore while the waiting task goes on and frees its stack. And
   completion is more suited for this kind of stuff anyway.

 - removes two unneeded exports, pointed out by Andrew.

This moves CLONE_SETTID and CLONE_CLEARTID handling into kernel/fork.c,
where it belongs.  [the CLONE_SETTLS is x86-specific and thus remains in
the per-arch process.c] This makes support for these two new flags much
easier: architectures only have to pass in the user_tid pointer.

It would be helpful if these msr.h #defines could get in.

It makes no sense to keep efi.h as an ia64-specific header (there really
are x86 machines coming out with optional EFI BIOS support).

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Fix a __FUNCTION__ paste in revoke.c

O_DIRECT support for ext3.

It works OK in all journalling modes.

Updates to the file metadata and inode are journalled as usual.

If the system crashes during an appending O_DIRECT write then journal
recovery will truncate the written-to file back to the length which it
had on entry to that write.

If the system crashes during a file overwrite to existing blocks then
the file contents will be an unknown mixture of old and new.

If the system crashes during a file overwrite which instantiates new
blocks in the middle of the file then there is a possibility of
uninitialised disk blocks being present in the file post-recovery.

mpage_writepages() does a lock_page() on pages to be written back, even
when it is being used for page reclaim writeback.

This is normally OK, because the page is unlocked quickly - pages are
unlocked during writeback and nobody should be performing __GFP_FS
allocations inside lock_page().

But it has introduced a ranking problem in ext3:

generic_file_write
->lock_page
  ->ext3_prepare_write
    ->journal_start	(waits for a commit)

versus

ext3_create()
->journal_start()
  ->ext3_new_inode(GFP_KERNEL)
    ->page reclaim
      ->mpage_writepages
        ->lock_page	(locks up, transaction is held open)

Maybe sometime, I'll have to turn mpage_writepages' lock_page into a
trylock if the caller is PF_MEMALLOC.  But for now, let's make ext3's
inside-transaction allocations use GFP_NOFS.  There is only one of them.

This is a performance and correctness fix against the writeback paths.

The writeback code has competing requirements.  Sometimes it is used
for "memory cleansing": kupdate, bdflush, writer throttling, page
allocator writeback, etc.  And sometimes this same code is used for
data integrity pruposes: fsync, msync, fdatasync, sync, umount, various
other kernel-internal uses.

The problem is: how to handle a dirty buffer or page which is currently
under writeback.

For memory cleansing, we just want to skip that buffer/page and go onto
the next one.  But for sync, we must wait on the old writeback and then
start new writeback.

mpage_writepages() is current correct for cleansing, but incorrect for
sync.  block_write_full_page() is currently correct for sync, but
inefficient for cleansing.

The fix is fairly simple.

- In mpage_writepages(), don't skip the page is it's a sync
operation.

- In block_write_full_page(), skip the buffer if it is a sync
operation.  And return -EAGAIN to tell the caller that the writeout
didn't work out.  The caller must then set the page dirty again and
move it onto mapping->dirty_pages.

This is an extension of the writepage API: writepage can now return
EAGAIN.  There are only three callers, and they have been updated.

fail_writepage() and ext3_writepage() were actually doing this by
hand.  They have been changed to return -EAGAIN.  NTFS will want to
be able to return -EAGAIN from its writepage as well.

- A sticky question is: how to tell the writeout code which mode it
is operating in?  Cleansing or sync?

It's such a tiny code change that I didn't have the heart to go and
propagate a `mode' argument down every instance of writepages() and
writepage() in the kernel.  So I passed it in via current->flags.

Incidentally, the occurrence of a locked-and-dirty buffer in
block_write_full_page() is fairly rare: normally the collision avoidance
happens at the address_space level, via PageWriteback.  But some
mappings (blockdevs, ext3 files, etc) have their dirty buffers written
out via submit_bh().  It is these buffers which can stall
block_write_full_page().

This wart will be pretty intrusive to fix.  ext3 needs to become fully
page-based (ugh.  It's a block-based journalling filesystem, and pages
are unnatural).  blockdev mappings are still written out by buffers
because that's how filesystems use them.  Putting _all_ metadata
(indirects, inodes, superblocks, etc) into standalone address_spaces
would fix that up.

- filemap_fdatawrite() sets PF_SYNC.  So filemap_fdatawrite() is the
kernel function which will start writeback against a mapping for
"data integrity" purposes, whereas the unexported, internal-only
do_writepages() is the writeback function which is used for memory
cleansing.  This difference is the reason why I didn't consolidate
those functions ages ago...

- Lots of code paths had a bogus extra call to filemap_fdatawait(),
which I previously added in a moment of weak-headedness.  They have
all been removed.

A reworked version of the batched page freeing and lock amortisation
for VMA teardown.

It walks the existing 507-page list in the mmu_gather_t in 16-page
chunks, drops their refcounts in 16-page chunks, and de-LRUs and
frees any resulting zero-count pages in up-to-16 page chunks.

Clean up put_page() and page_cache_release().  It's pretty simple now:

#define page_cache_get(page)           get_page(page)
#define page_cache_release(page)       put_page(page)

it was only being used in invalidate_inode_pages(), and from there,
pagevec_release() does the same thing.

As suggested by Daniel - it's a bug to run put_page_testzero
against a zero-ref page.

please apply this patch (Robert ACK-ed it). While there is a preemptible
kernel entry already, i think listing this at the scheduler entry is
justfied, preemption has a number of scheduler interactions.

this is an updated version of the LDT fixes. It fixes the following kinds
of problems:

 - fix a possible gcc optimization causing a race causing the loading of a
   corrupt LDT descriptor upon context switch. [this fix got simplified
   over previous versions.]

 - remove an unconditional OOM printk, and there's no need to set ->size
   in the OOM path.

 - fix preemption bugs, load_LDT()/clear_LDT() was not preemption-safe,
   when it was used outside of spinlocks.

the context-switch race is the following. 'LDT modification' is the
following operation: the seg->ldt pointer is modified, then seg->size is
modified. In theory gcc is free to reschedule the two modifications, and
first modify ->size, then ->ldt. Thus if this modification is not
synchronized with context-switches, another thread might see a temporary
state of the new ->size [which was increased], but still the old pointer.
Ie.:

	CPU0				CPU1

	pc->size = newsize;
					load_LDT(); // (oldptr, newsize)
	pc->ldt = newptr;

the corrupt LDT is loaded until the SMP cross-call is sent, leaving the
window open for many usecs.

the fix is to put a wmb() after ->ldt modifications. [this is also in
preparation of not-write-ordered SMP x86 designs.]

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some mainboards (Andrew Morton's Dell) report that even everything
is okay with AUX. Also remove a check for very old AMI i8042's, which
could generate false positives on modern buggy mainboards.

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