Currently we fail if someone requests a valid io scheduler, but it's
modular and not currently loaded. That can happen from a driver init
asking for a different scheduler, or online switching through sysfs
as requested by a user.

This patch makes elevator_get() request_module() to attempt to load
the appropriate module, instead of requiring that done manually.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

It's cumbersome to browse a radix tree from start to finish, especially
since we modify keys when a process exits. So add a hlist for the single
purpose of browsing over all known cfq_io_contexts, used for exit,
io prio change, etc.

This fixes http://bugzilla.kernel.org/show_bug.cgi?id=9948Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

That way the interface is symmetric, and calling blk_rq_unmap_user()
on the request wont oops.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

Commit b2e895db #if 0'ed this code stating:

<--  snip  -->

    [PATCH] revert blockdev direct io back to 2.6.19 version

    Andrew Vasquez is reporting as-iosched oopses and a 65% throughput
    slowdown due to the recent special-casing of direct-io against
    blockdevs.  We don't know why either of these things are occurring.

    The patch minimally reverts us back to the 2.6.19 code for a 2.6.20
    release.

<--  snip  -->

It has since been dead code, and unless someone wants to revive it now
it's time to remove it.

This patch also makes bio_release_pages() static again and removes the
ki_bio_count member from struct kiocb, reverting changes that had been
done for this dead code.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>

This patch makes the needlessly global struct def_blk_aops static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>

blk_settings_init() can become static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>

blk_ioc_init() can become static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>

request_cachep needlessly became global.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>

* git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6:
  ide-cd: fix missing residual count setting in DMA mode
  ht6560b: force prefetch for some devices
  ht6560b can only do up to PIO mode 4
  linux/hdsmart.h: fix goofups (take 2)
  via82cxxx: add new PCI id for cx700
  falconide: locking bugfix
  MAINTAINERS: update ide-cd maintainer's email address
  ide/libata: ST310211A has buggy HPA too
  ide: Add missing base addresses for falconide and macide

Clearly this was supposed to be an == not an = in the if statement.
This patch also causes us to stop processing execve args once we have
failed rather than continuing to loop on failure over and over and over.
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This patch fixes the missing residual count setting in DMA mode,
which was introduced during the conversion to blk-end-request.
The residual count could be used by the request submitter.
So if it isn't set correctly, some upper layers does not work.
(e.g. wodim for CD burning.)

The bug is in only DMA mode.
In PIO mode, we are setting the residual count correctly,
so no need to fix.
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Reported-by: Andreas Schwab <schwab@suse.de>
Tested-by: Andreas Schwab <schwab@suse.de>
Tested-by: Laura Garcia <nevola@gmail.com>
Tested-by: Borislav Petkov <petkovbb@googlemail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Prefetch needs to be set for some ide devices to work when connected to
a ht6560b interface. This was not always done properly, causing a system
with a HD and CD on the primary interface to not work properly. Or, in
effect, hang hard.

This patch forces prefetch on devices before checking whether it
is necessary to change the settings in the interface

This patch should also be applied to 2.4. I don't currently have a
2.4 tree around.

(also change my email address)
Signed-off-by: Jan Evert van Grootheest <janevert@caiway.nl>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

According to the datasheet, ht6560b only supports up to PIO mode 4.

[bart: manually ported it over 2.6.25-rc2]
Signed-off-by: Jan Evert van Grootheest <janevert@caiway.nl>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Fix goofups of commit 76166952
("<linux/hdsmart.h> is not used by kernel code").

Also update include/linux/Kbuild to reflect the fact that hdsmart.h
uses __KERNEL__ ifdefs now.
Reported-by: "Robert P. J. Day" <rpjday@crashcourse.ca>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

[bart: manually ported it over via82cxxx changes]

From: Andrew Smith <asmith@tranquility.fsbusiness.co.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

commit 8ac4ce74 ("ide: fix host drivers
depending on ide_generic to probe for interfaces (take 2)") moved probing
to falconide but forgot to take care of Atari specific locking - fix it.

Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Signed-off-by: Mikko Rapeli <mikko.rapeli@teleca.com>
Tested-by: Bart Champagne <bart@as35701.net>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

commit 29dd5975 ("ide: remove ide_setup_ports")
forgot to take into account the base addresses for the CONTROL registers for
falconide and macide, as pointed out by Michael Schmitz.

Falconide was tested on Aranym.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
  RDMA/nes: Fix possible array overrun
  RDMA/nes: Fix VLAN support
  RDMA/nes: Fix MAC interrupt erroneously masked on ifdown
  IB: Fix return value in ib_device_register_sysfs()

* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86:
  x86: fix lguest build failure
  x86: reenable support for system without on node0
  x86: CPA: avoid double checking of alias ranges
  x86: CPA no alias checking for _NX
  x86: zap invalid and unused pmds in early boot
  x86: CPA, fix alias checks

* git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb: (59 commits)
  V4L/DVB (7219): zoran: Fix namespace conflicts with Zoran 'GPIO_MAX' enum
  V4L/DVB (7205): tuner-xc2028 depends on FW_LOADER
  V4L/DVB (7201): cx88-mpeg: Fix race condition in variable access
  V4L/DVB (7200): Fix FM firmware loading
  V4L/DVB (7198): V4L, include ioctl.h in videodev headers
  V4L/DVB (7197): bttv: Fix overlay divide error
  V4L/DVB (7195): xc5000: fix build error when built as module
  V4L/DVB (7194): cx88-mpeg: Allow concurrent access to cx88-mpeg devices
  V4L/DVB (7193): tveeprom: Add proper tuner mapping for hauppauge eeprom id 133
  V4L/DVB (7192): Adds support for Genius TVGo A11MCE
  V4L/DVB (7189): autosuspend support
  V4L/DVB (7188): radio-si470x version 1.0.6
  V4L/DVB (7186): tda10086: make the 22kHz tone for DISEQC a config option
  V4L/DVB (7183): radio-si470x: fix build warning
  V4L/DVB (7180): em28xx: add URB_NO_TRANSFER_DMA_MAP, since urb->transfer_dma is set
  V4L/DVB (7179): Allow more than one em28xx board
  V4L/DVB (7164): em28xx-alsa: Add a missing mutex
  V4L/DVB (7163): em28xx: makes audio settings more stable
  V4L/DVB (7162): em28xx: Fix endian and returns the correct values
  V4L/DVB (7161): em28xx: Fix printing debug values higher than 127
  ...

* 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6:
  [XFS] Added quota targets and removed dmapi directory
  [XFS] Fix up xfs out-of-tree builds. (a.k.a. external modules)
  [XFS] Remove Makefile wrappers in XFS

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  [CRYPTO] null: Add missing Kconfig dependency on BLKCIPHER
  [CRYPTO] tcrypt: Add missing Kconfig dependency on BLKCIPHER
  [HIFN]: Fix invalid config ifdefs for RNG support

* git://git.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt:
  timer_list: print relative expiry time signed

* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild:
  kbuild: explain why DEBUG_SECTION_MISMATCH is UNDEFINED
  kbuild: fix building vmlinux.o
  kbuild: allow -fstack-protector to take effect
  kconfig: fix select in combination with default

drivers/lguest/x86/switcher_32.S:(.text+0x3815f8): 
	undefined reference to `LGUEST_PAGES_regs_trapnum'

This problem was caused by asm-offsets.c only having the offsets when
lguest *guest* support was set, not lguest host (host support used to
imply guest support, so now they're separate these bugs come out).

Lguest guest support and host support are separate config options:
they used to be tied together. Sort out which parts of asm-offsets are
needed for Guest and Host.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

One system doesn't have RAM for node0 installed.

SRAT: PXM 0 -> APIC 0 -> Node 0
SRAT: PXM 0 -> APIC 1 -> Node 0
SRAT: PXM 1 -> APIC 2 -> Node 1
SRAT: PXM 1 -> APIC 3 -> Node 1
SRAT: Node 1 PXM 1 0-a0000
SRAT: Node 1 PXM 1 0-dd000000
SRAT: Node 1 PXM 1 0-123000000
ACPI: SLIT: nodes = 2
 10 13
 13 10
mapped APIC to ffffffffff5fb000 (        fee00000)
Bootmem setup node 1 0000000000000000-0000000123000000
  NODE_DATA [000000000000e000 - 0000000000014fff]
  bootmap [0000000000015000 -  00000000000395ff] pages 25
Could not find start_pfn for node 0
Pid: 0, comm: swapper Not tainted 2.6.24-smp-g5a514e21-dirty #14

Call Trace:
 [<ffffffff80bab498>] free_area_init_node+0x22/0x381
 [<ffffffff8045ffc5>] generic_swap+0x0/0x17
 [<ffffffff80bab0cc>] find_zone_movable_pfns_for_nodes+0x54/0x271
 [<ffffffff80baba5f>] free_area_init_nodes+0x239/0x287
 [<ffffffff80ba6311>] paging_init+0x46/0x4c
 [<ffffffff80b9dda5>] setup_arch+0x3c3/0x44e
 [<ffffffff80b978be>] start_kernel+0x6f/0x2c7
 [<ffffffff80b971cc>] _sinittext+0x1cc/0x1d3

This happens because node 0 is not online, but the node state in
mm/page_alloc.c has node 0 set.

        nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
                [N_POSSIBLE] = NODE_MASK_ALL,
                [N_ONLINE] = { { [0] = 1UL } },

So we need to clear node_online_map before initializing the memory.
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

When the CPA code is called with an virtual address in the range of
the direct mapping or the high alias then we do not need to run
through the alias check for this range.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

NX settings are not required to be consistent across alias mappings.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

The early boot code maps KERNEL_TEXT_SIZE (currently 40MB) starting
from __START_KERNEL_map. The kernel itself only needs _text to _end
mapped in the high alias. On relocatible kernels the ASM setup code
adjusts the compile time created high mappings to the relocation. This
creates invalid pmd entries for negative offsets:

0xffffffff80000000 -> pmd entry: ffffffffff2001e3
It points outside of the physical address space and is marked present.

This starts at the virtual address __START_KERNEL_map and goes up to
the point where the first valid physical address (0x0) is mapped.

Zap the mappings before _text and after _end right away in early
boot. This removes also the invalid entries.

Furthermore it simplifies the range check for high aliases.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

c_p_a() did not discover all aliases correctly. (such as when called
on vmalloc()-ed areas or ioremap()-ed areas)

Push the alias checks to the lower, physical level and consistently
discover all aliases that might exist: the low direct mappings and
the high linear kernel-text mappings (on 64-bit).

Thanks to Andi Kleen for pointing out that this was buggy.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

In nes_create_qp(), the test

	if (nesqp->mmap_sq_db_index > NES_MAX_USER_WQ_REGIONS) {

is used to error out if the db_index is too large; however, if the
test doesn't trigger, then the index is used as

	nes_ucontext->mmap_nesqp[nesqp->mmap_sq_db_index] = nesqp;

and mmap_nesqp is declared as

	struct nes_qp      *mmap_nesqp[NES_MAX_USER_WQ_REGIONS];

which leads to an array overrun if the index is exactly equal to
NES_MAX_USER_WQ_REGIONS.  Fix this by bailing out if the index is
greater than or equal to NES_MAX_USER_WQ_REGIONS.

This was spotted by the Coverity checker (CID 2162).
Acked-by: Glenn Streiff <gstreiff@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

Thanks to Martin Michlmayr <tbm@cyrius.com> for reporting this issue:

The zoran driver fails to compile on the ARM Orion platform with:

In file included from drivers/media/video/zoran_procfs.c:50:
drivers/media/video/zoran.h:232: error: expected identifier before numeric
constant

The reason is that drivers/media/video/zoran.h defines an enum with
GPIO_MAX in it, but Orion contains a #define GPIO_MAX 32 in
include/asm-arm/arch-orion/orion.h
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

There was a possible race condition in the increment/decrement of
the active device references counter.
Thanks to Trent Piepho (xyzzy@speakeasy.org) for bringing it up.
Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

There's no need to load SCode table for FM.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

Fix compilation of user processes which includes videodev*.h but
not includes linux/ioctl.h:

v4l2ext_helper.c: In function 'process_ioctl':
v4l2ext_helper.c:183: warning: implicit declaration of function '_IOWR'
v4l2ext_helper.c:183: error: expected expression before 'struct'
v4l2ext_helper.c:183: error: case label does not reduce to an integer constant
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

The initial work to convert the bttv driver to V4L2 "Partial conversion
from V4L1 to V4L2" (e84619b1), missed
the line which set the appropriate overlay crop structure in the newly
allocated bttv_buffer.  This then causes a divide error in the
bttv_calc_geo function.
Signed-off-by: Robert Fitzsimons <robfitz@273k.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/built-in.o: In function `set_type':
tuner-core.c:(.text+0x8879d): undefined reference to `xc5000_attach'
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Reviewed-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>