This patch fixes the handling of IOPL when sysenter is used.

Currently when entering kernel mode, IOPL is not changed and it is not
presserved across context switches: thus, in the kernel, the IOPL value
is random.

This is not a problem when using iret, because it restores eflags, but
the sysexit code currently doesn't, which means that that IOPL becomes
random in user mode too which is of course not good.

This patch fixes the problem by saving eflags across context switches.

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

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

When separating out the duplicated xmit handling, we were lucky that
we could reuse BC_Send_Data for our purposes. Introduce a more
extensible "struct bc_l1_ops" instead, and initialize that in
the code that provides the functionality, not in the users.

Realize that *_empty_fifo() and *_fill_fifo() are always called
under the card lock, so no additional protection when reading/writing
fifos is needed.

Same thing which just happened to hscx_irq.c - Use the struct
bc_hw_ops instead of macros and inlining.

Each driver for HSCX based cards defined some hardware access macros
and #include'd hscx_irq.c. Instead, we now add the needed routines to
the corresponding bc_hw_ops and use regular function calls. It's a slight
bit less efficient, but shouldn't be noticable.

Using {isac,hscx}_{read,write} instead of the low-level
readreg/writereg simplifies the code a bit.

Preparing for un-inlining hscx_irq.c, we add operations needed
to access the B-Channel FIFO's, similar to what we already have
for the D-Channel.

Basically only a cosmetic patch, with much renaming and a little
rearranging of code.

Just a simple search and replace, switch to the more commonly
used "u8" type.

In many cases, readreg()/writereg() users can be simplified by
passing struct IsdnCardState instead of individual register
addresses.

Add more netdev bus dependencies.  Patch by Arnd Bergmann.

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

We were using the virtual address for cache flushing in
update_mmu_cache, which is ok if the address is in the current mm,
but if it isn't we have to do something different, namely,
flush using the physical address.

options relating to 4xx-based boards there.

All the iSeries machines that can run Linux are 64-bit PowerPC
machines and are now supported by the ppc64 kernel.  Since no-one
is interested in maintaining the iSeries support in the ppc32
kernel, I am removing it.

into samba.org:/home/paulus/kernel/for-linus-ppc

The patch below removes the tons of #if's in drivers/scsi/i91uscsi.c in
2.5.52 that are only needed for using this file in kernel 2.0.

into samba.org:/home/paulus/kernel/for-linus-ppc

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

The following patch fixes an oopsable (according to a few reports) bug
in the multiple open exclusion logic in my sound drivers and a driver
derived from my code.

into nuts.ninka.net:/home/davem/src/BK/sparc-2.5

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

into redhat.com:/home/jgarzik/repo/net-drivers-2.5

into redhat.com:/home/jgarzik/repo/irda-2.5