This changes the /dev/mem caching behaviour on x86-64 to be compatible
with i386.

By default everything is set cached.

This actually makes WC MTRRs on AMD systems work, which would get
overriden by the UC PAT bits that were set earlier.  This can make DVD
decoding with hardware support a lot faster. 

It also supports O_SYNC now, like i386, although that is not really
safe, because it allows the user to create undefined cache attribute
conflicts that can corrupt caches in some circumstances.  I kept it for
now.  Better would to disallow it, until Terrence Ripperda's PAT
framework is getting merged, that can avoid these problems. 

Actually it would be probably a good idea to add a printk here to catch
broken programs for i386 and x86-64, but that is for another patch.

Various accumulated x86-64 patches and bug fixes.

It fixes one nasty bug that has been there since NX is used by 
default in the kernel. With heavy AGP memory allocation it would
set NX on parts of the kernel mapping in some corner cases, which gave
endless crash loops. Thanks goes to some wizards in AMD debug labs
for getting a trace out of this.

Also various other fixes. This patches only changes x86-64 specific
files, i have some changes outside too that I am sending separately.

 - Fix help test for CONFIG_NUMA
 - Don't enable SMT nice on CMP
 - Move HT and MWAIT checks up to generic code
 - Update defconfig
 - Remove duplicated includes (Arthur Othieno)
 - Set up GSI entry for ACPI SCI correctly (from i386)
 - Fix some comments
 - Fix threadinfo printing in oopses
 - Set task alignment to 16 bytes
 - Handle NX bit for code pages correctly in change_page_attr()
 - Use generic nops for non amd specific kernel
 - Add __KERNEL__ checks in unistd.h (David Lee)

Uncovered by recent cleanup of "dev_dbg()".

Stomp a C99ism.

Initialise the semaphore even if !MODULE

These (unused) arrays are causing huge stack utilisation when instantiated in
an auto variable.  Remove them for now.

From: Michael Buesch <mbuesch@freenet.de>

- BUG_ON() conversion

- Remove redundant dump_stack() (BUG already does that)

From: Olaf Kirch <okir@suse.de>

Authentication code in net/sunrpc makes frequent use of groups_alloc(0),
which seems to clobber memory past the end of what it allocated.

If called with gidsetsize == 0, groups_alloc will set nblocks = 0,
but still does a

	group_info->blocks[0] = group_info->small_block;

From: "Uwe Bugla" <uwe.bugla@gmx.de>

Fix up a mistake in the 2.4->2.6 forward-port of this driver.

From: Bart Samwel <bart@samwel.tk>

The attached patch is the outcome of a discussion with Nathan.

When laptop mode is active, there is no need for XFS to wake up xfsbufd (the
daemon that flushes buffers that are too old) too often.  The default is once
every second, this patch makes laptop mode do it once every 30 seconds.

From: Bart Samwel <bart@samwel.tk>

XFS now uses
	/proc/sys/fs/xfs/xfssyncd_centisecs
	/proc/sys/fs/xfs/xfsbufd_centisecs
	/proc/sys/fs/xfs/age_buffer_centisecs

Here's a patch to support these values in the laptop mode control script.

From: Bjorn Helgaas <bjorn.helgaas@hp.com>

Now that everybody has acpi_gsi_to_irq(), we can nuke the deprecated
acpi_irq_to_vector().  No references remain.

From: "Randy.Dunlap" <rddunlap@osdl.org>

From: "Luiz Fernando N. Capitulino" <lcapitulino@prefeitura.sp.gov.br>

floppy_debugt.patch: better use of the debugt functions.

From: "Randy.Dunlap" <rddunlap@osdl.org>

From: "Luiz Fernando N. Capitulino" <lcapitulino@prefeitura.sp.gov.br>

Adds a better audit for floppy_init().  Fixes one real bug (in calling
blk_queue_max_sectors()).

From: <bart@samwel.tk>

XFS needs `laptop_mode'.

From: Paul Mundt <lethal@linux-sh.org>

The old drivers/char sh-sci driver is no long used by anyone, both sh and
h8300 are using the drivers/serial version at this point, so we can get rid
of the old one entirely.

From: Andi Kleen <ak@muc.de>

*** Warning: "memcmp" [drivers/atm/zatm.ko] undefined!

gcc 3.4 specific problem.  This patch should fix it.  Actually it would be
better to move all these EXPORT_SYMBOLs into lib/string.c, it is silly that
each arch has to duplicate all that.

From: Christoph Hellwig <hch@lst.de>

Someone blindly added sysfs support to the driver long time ago without
understanding the implications (and if they were understood the driver
would need half a rewrite for it).  Herber Xu recently noticed the problems
this causes on unload, so let's if 0 out all that code and get the driver
working again.

It's silly that writing to /proc/sysrq-trigger does nothing if you haven't
enabled /proc/sys/kernel/sysrq.  So provide a new __handle_sysrq() which
ignores the sysrq_enabled check.

The patch also withdraws __handle_sysrq_nolock() from the kernel API.  It had
no callers.

arch/x86_64/kernel/msr.c:1:10: warning: extra tokens at end of #ident directive

From: Adrian Bunk <bunk@fs.tum.de>

drivers/scsi/aic7xxx_old.c: In function `aic7xxx_release':
drivers/scsi/aic7xxx_old.c:10971: warning: implicit declaration of function `pci_release_regions'

From: Adrian Bunk <bunk@fs.tum.de>

drivers/net/tlan.c: In function `tlan_remove_one':
drivers/net/tlan.c:449: warning: implicit declaration of function `pci_release_regions'

From: Adrian Bunk <bunk@fs.tum.de>

drivers/char/cyclades.c: In function `cy_cleanup_module':
drivers/char/cyclades.c:5638: warning: implicit declaration of function `pci_release_regions'

From: Mathieu Chouquet-Stringer <mchouque@online.fr>

This patch makes the following code work again:

#ifdef STT_REGISTER
                if (info->hdr->e_machine == EM_SPARC ||
                    info->hdr->e_machine == EM_SPARCV9) {
                        /* Ignore register directives. */
                        if (ELF_ST_TYPE(sym->st_info) == STT_REGISTER)
                                break;
                }
#endif

This portion of code is sparc specific and nothing else in modpost.c uses
e_machine meaning cross-compiling for sparc on i386 (or any little endian
machine) is the only way to experience the bug.

Without it, e_machine has the wrong value and modpost then generates a lot
of "*** Warning: \"symbol\" [filename.ko] undefined" messages.

From: Geert Uytterhoeven <geert@linux-m68k.org>

From: Arjan van de Ven <arjanv@redhat.com>,
      Rusty Russell <rusty@rustcorp.com.au>

The patch below resolves the "Not Yet Implemented" print_modules() thing.
This is a really useful feature for distros; it allows us to do statistical
analysis on which modules are present how often in oopses compared to how
often they are used normally.  In addition it helps to spot candidates for
certain bugs without having to go back to the customer asking for this
information.

From: Oleg Drokin <green@linuxhacker.ru>

Thanks to Standford guys, a case where reiserfs can dereference NULL
pointer if memory allocation fail during mount was identified.

From: Alan Cox <alan@redhat.com>

The block layer checks for -EINVAL from block layer driver ioctls.  This is
wrong - ENOTTY is unknown and some drivers correctly use this.  I suspect
for an internal ioctl 2.7 should change to -ENOIOCTLCMD and bitch about old
style returns

This is conservative fix for the 2.6 case, it keeps the bogus -EINVAL to
avoid breaking stuff

From: Alan Cox <alan@redhat.com>

From: Chris Wright <chrisw@osdl.org>

Remove confusing error message when loading as secondary module, and ditch
conditional MY_NAME macro.

From: Chris Wright <chrisw@osdl.org>

The build includes capability.c when CONFIG_SECURITY=n, yet the whole file is
ifdef'd out.  Remove unnecessary build step as well as superfluous ifdefs.

From: Pavel Roskin <proski@gnu.org>

I get a compile error when I define "DEBUG" in arch/i386/pci/pci.h.  Variable
rt is not defined in sis_router_probe(), file arch/i386/pci/irq.c.

From: Greg Edwards <edwardsg@sgi.com>

On ia64, EXEC_PAGESIZE (max page size) is 65536, but the default page size is
16k.  This results in NGROUPS_PER_BLOCK in include/linux/sched.h being
calculated incorrectly when the page size is anything other than 64k.  For
example, on a 16k page size kernel, a setgroups() call with a gidsetsize of
65536 will end up walking over memory since only 1/4 of the needed pages were
allocated for the blocks[] array in the group_info struct.

Patch below calculates NGROUPS_PER_BLOCK from PAGE_SIZE instead.

From: Jan Kara <jack@ucw.cz>

Fix a null-pointer-deref oops in the quota code.

From: "Randy.Dunlap" <rddunlap@osdl.org>

From: <WHarms@bfs.de>(Walter Harms)

(acked by Gerd)

From: Bart Samwel <bart@samwel.tk>

The laptop mode control script incorrectly guesses XFS_HZ=1000.  This is
incorrect, since the patches that made XFS use USER_HZ went into 2.6.6 as
well.  This changes XFS_HZ to 100 and removes the warning from the doc about
checking XFS_HZ.

From: Deepak Saxena <dsaxena@plexity.net>

Following patch adds a driver for the watchdogs on the Intel IXP4xx family of
network processors (ARM).

From: Christian Groessler <cpg@aladdin.de>

Our AladdinCard also uses the oxsemi_840 chips and locks up when ecp mode
is enabled.

Fix some silliness in there.