In vm86 mode we did not save/restore %gs [and %fs] properly, which
breaks new-style threading.

on x86 - the kernel doesn't really care (as long as it's all flat 32-bit),
and it means that the return path for sysenter/sysexit can avoid re-loading
the segment registers.

NOTE! This means that _all_ kernel code (not just the sysenter path) must
be appropriately changed, since the kernel knows the conventions and doesn't
save/restore DS/ES internally on context switches etc.

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

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

and make the alignment of the return point 
be saner.

into raven.il.steeleye.com:/home/jejb/BK/scsi-for-linus-2.5

into raven.il.steeleye.com:/home/jejb/BK/scsi-for-linus-2.5

Here is my proposal for bringing ide-scsi in line with the current kernel.

The attached patch does:

1. Change from old style initialization to the new hotplug initialization model.
   It involves declaring both a parent device and bus kernel object, which feels
   a bit awkward, but hey, it works.

2. Make ide-scsi request sense itself when CHECK_CONDITION is asserted. This 
   change particularly makes ide-scsi run much smoother on my test box.

3. Implement eh_abort_handler and eh_device_reset_handler. I have no real way
   to thoroughly test these new routines, so for this part particularly I ask
   for peer review.

This patch uses the module_param() facility introduced in
lk 2.5.52 (see linux/moduleparam.h) to simplify boot time
and module load time parameters for the scsi_debug driver.

The intent of module_param() is to unify
   - boot time parameters
   - module load time parameters
   - sysfs driver parameters
into a few simple calls (seen from the driver's point of view).
The sysfs capability hasn't been implemented yet. Using
module_param() removes over 100 lines of boilerplate code
from the scsi_debug driver.

Following the conventions suggested by Rusty, scsi_debug's
kernel boot time options have been changed to this form:
    scsi_debug.num_devs=2
while the module load options are now like this:
    modprobe scsi_debug num_devs=2

This patch also updates the Kconfig entry for the scsi_debug
driver.

On Fri, Dec 20, 2002 at 08:29:23PM -0500, Doug Ledford wrote:
> And I was right.  One little q = NULL; is all that was missing.  Anyway,
> here's a printout of what startup looks like with this patch in place
> under 2.5.52.  This should make you happy Justin ;-)

Okay, I looked at the patches that are in mainline and they look pretty
cool to me.  When looking over the code (in preparation of implementing
Justin's suggestion to get rid of the highmem_io flag) I found quite
a bit small stuff to make the code in that area a lot cleaner:

- new helper scsi_calculate_bounce_limit to calculate the bounce
  limit for a scsi host, remove a copy of that code ni st.c
- scsi_initialize_queue gets replace with scsi_alloc_queue, this
  one now takes only a struct Scsi_Host and returns the request queue,
  it's paired with a small scsi_free_queue helper.

Diffstat:

 hosts.h     |    3 -
 scsi.c      |   43 ----------------------
 scsi.h      |    1
 scsi_scan.c |  113 ++++++++++++++++++++++++++++++++++--------------------------
 scsi_syms.c |    5 ++
 st.c        |   16 +-------
 6 files changed, 73 insertions(+), 108 deletions(-)

Code mostly originally by James Cleverdon.

Abstracts out more clustered_apic_mode gunk into

 - ioapic_phys_id_map()
 - wakeup_secondary_cpu()
 - setup_portio_remap()

This one fixes up the IPI code to do something more sensible.  Sorry,
was just too ugly to leave it alone ...  but I did keep it seperated out
;-) Though this is not an equivalent transform it will only affect
NUMA-Q & summit - same op twice because some twit just split it out in
the last patch for both NUMA-Q & Summit.

Because clustered apic logical mode can't do arbitrary broadcasts of
addressing (it's not just a bitmap), I have to do send IPI instructions
as a sequence of unicasts.  However, there's already a loop in the
generic send_IPI_mask code to do that ...  there's no need to call
send_IPI_mask once for each CPU.  The comment I wrote at the time even
noted that this was silly.

Reformat the IPI stuff, specifically send_IPI_mask, send_IPI_allbutself,
and send_IPI_all.  Though the way they work is pretty silly for NUMA-Q,
I do an equivalent transform here, and fix the code in a seperate patch
(next one).  Goes into mach_ipi.h

Most of code originally by James Cleverdon.

More stuff reformed in the mpparse sections - this time not apic stuff,
so we create mach_mpparse.h and stick it in there.

Abstracts out:
 - mpc_oem_bus_info() - stores mappings between buses and nodes/quads.
 - mpc_oem_pci_bus()  - stores mappings between global and local pci bus numbers

Changes summit_check() into mps_oem_check() to generalise it.

Most of code originally by James Cleverdon.

Abstracts out code from the mpparse stuff into:

 - mpc_apic_id()
 - apicid_to_cpu_present()

instead of using clustered_apic_mode switching.

Code originally by James Cleverdon.

This abstracts out some sections that were switched by
clustered_apic_mode into the following functions:

 - apic_id_registered()
 - init_apic_ldr()
 - multi_timer_check()

Changes the return check in balance_irq from testing clustered_apic_mode
to testing "no_balance_irq" to be more general.

The removal of:
	entry.dest.logical.logical_dest = TARGET_CPUS;
is because it's a duplicate (we do it twice in the same function for
no reason).

This adds a shell of a NUMA-Q subarch directory, and copies
mach-default/mach_apic.h into it.  I then edited the default version to
remove the NUMA-Q stuff, and the NUMA-Q version to remove the default
stuff.

Patch from John Stultz.

This reorganises the subarch files to put all the headers under the
include dir, instead of mixing them up with the C files.  The only
interesting part is the top section where he makes it fall back from the
subarch dir to the default dir if there's no .h file under the subarch
dir.

This means we can create multiple subarches without copying every single
file that any subarch wants into all the directories.  And is much
tidier, IMHO.

into kernel.bkbits.net:/home/davem/net-2.5

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

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

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

the fast case with a pushf/popf, by having the kernel debug trap
set the TIF_SINGLESTEP flag and causing the return path to dtrt.

boot_cpu_data should contain the common capabilities of all cpus in the
system. identify_cpu [arch/i386/kernel/cpu/common.c] tries to enforce
that. But right now, the SMP trampoline code [arch/i386/kernel/head.S]
overwrites boot_cpu_data when the secondary cpus are started, i.e.
boot_cpu_data contains the capabilities from the last cpu that booted :-(

The attached patch adds a new, __initdata variable for the asm code.

Restore the accidentally dropped code to handle "init=xxx"

This fixes a hang in change_page_attr() that occured with mem=nopentium.

Make sure a non large page kernel mapping is handled correctly.
Previously the page reference counter was handled incorrectly in this
case.

Also hardens change_page_attr against bogus addresses.  You get an
EINVAL now.

"mem=nopentium" would clear the PSE bit in boot_cpu_data, but the CPU
detection later would overwrite it again from CPUID.

The large pages would be correctly disabled, but cpu_has_pse was lying.

This patch makes sure it stays clear when the option is given.

I also took the liberty to remove these obnoxious cpu capability
printks who give no use information (the data can be either gotten
from CPUID in user space in raw form or from /proc/cpuinfo processed)

According to Intel's recommendation, 'rep;nop; should be called before
testing if the lock variable was modified (i.e. rep nop;cmp;jcc). The
current implementation does it the wrong way around: first test, then
wait, then branch. I've asked Asit Mallik from Intel, and he recommended
to change it.

It should be at least consistent: Right now, spinlock uses
'cmp;rep nop;jcc', rwlock uses 'rep nop;cmp;jcc'

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