Impact: circular locking bugfix

The various implemetnations and proposed implemetnations of work_on_cpu()
are vulnerable to various deadlocks because they all used queues of some
form.

Unrelated pieces of kernel code thus gained dependencies wherein if one
work_on_cpu() caller holds a lock which some other work_on_cpu() callback
also takes, the kernel could rarely deadlock.

Fix this by creating a short-lived kernel thread for each work_on_cpu()
invokation.

This is not terribly fast, but the only current caller of work_on_cpu() is
pci_call_probe().

It would be nice to find some other way of doing the node-local
allocations in the PCI probe code so that we can zap work_on_cpu()
altogether.  The code there is rather nasty.  I can't think of anything
simple at this time...

Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

kthreadd is the single thread which implements ths "create" request, move
sched_setscheduler/etc from create_kthread() to kthread_create() to
improve the scalability.

We should be careful with sched_setscheduler(), use _nochek helper.
Signed-off-by: NOleg Nesterov <oleg@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Vitaliy Gusev <vgusev@openvz.org
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

Remove the unnecessary find_task_by_pid_ns(). kthread() can just
use "current" to get the same result.
Signed-off-by: NVitaliy Gusev <vgusev@openvz.org>
Acked-by: NOleg Nesterov <oleg@redhat.com>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
  x86 ACPI: Add support for Always Running APIC timer
  ACPI x86: Make aperf/mperf MSR access in acpi_cpufreq read_only
  ACPI x86: Cleanup acpi_cpufreq structures related to aperf/mperf
  ACPICA: delete check for AML access to port 0x81-83
  ACPI: WMI: use .notify method instead of installing handler directly
  sony-laptop: use .notify method instead of installing handler directly
  panasonic-laptop: use .notify method instead of installing handler directly
  fujitsu-laptop: use .notify method instead of installing hotkey handler directly
  fujitsu-laptop: use .notify method instead of installing handler directly
  ACPI: video: use .notify method instead of installing handler directly
  ACPI: thermal: use .notify method instead of installing handler directly
  ACPI battery: fix async boot oops
  ACPI: delete acpi_device.g_list
  NULL noise: drivers/platform/x86/panasonic-laptop.c
  ACPI: cpufreq: remove dupilcated #include
  ACPI: Adjust Kelvin offset to match local implementation
  ACPI: convert acpi_device_lock spinlock to mutex

* master.kernel.org:/home/rmk/linux-2.6-arm:
  [ARM] 5446/1: ohci-at91: Limit vbus_pin assignment to the size of the array
  [ARM] 5445/1: AT91: Remove flexible array from USBH platform data
  [ARM] 5447/1: Add SZ_32K
  [ARM] omap: fix omap1 clock usecount decrement bug
  [ARM] pxa: register AC97 controller devices
  [ARM] pxa/csb701: do not register devices on non-csb726 boads
  [ARM] pxa/colibri: get rid of set_irq_type()
  [ARM] pxa/colibri: provide MAC address from ATAG_SERIAL
  [ARM] pxa/cm-x2xx: fix ucb1400 not being registered
  [ARM] pxa: Add support for suspend on PalmTX, T5 and LD
  [ARM] pxa: PalmTE2 support for battery, UDC, IrDA and backlight
  [ARM] pxa: Palm Tungsten E2 basic support
  [ARM] pxa/em-x270: add libertas device registration
  [ARM] pxa/magician: Enable bq24022 regulator for gpio_vbus and pda_power

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc:
  mmc_spi: support for non-byte-aligned cards
  omap_hsmmc: Do not expect cmd/data to be non-null when CC/TC occurs
  mmc: Fix compile for omap_hsmmc.c
  mmc_spi: convert timeout handling to jiffies and avoid busy waiting
  mmc_spi: do not check CID and CSD blocks with CRC16
  omap_hsmmc: Flush posted write to IRQ
  New mail address for Pierre Ossman
  imxmmc: move RSSR BLR
  imxmmc: init-exit rework
  mmc: Accept EXT_CSD rev 1.3 since it is backwards compatible with 1.2

Thou shalt remember to use 'git add' or errors shall be visited on your
downloads and there shall be wrath from on list and much gnashing of teeth.

Thou shalt remember to use git status or there shall be catcalls and much
embarrasment shall come to pass.
Signed-off-by: NAlan "I'm hiding" Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Currently, the vbus_pin assignment loop is limited by the value of the "ports"
variable in the platform data.  Now that the vbus_pin array is no longer
flexible, we can use its actual size.
Signed-off-by: NJustin Waters <justin.waters@timesys.com>
Acked-by: NAndrew Victor <linux@maxim.org.za>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

The flexible array in the USBH platform data is not safe to copy.  The
compiler will not allocate any extra memory for the non-init platform
data structure (in the *_devices.c files) since it isn't given any
defaults at compile time.  When the probe function attempts to address
that array, it will actually attempt to access data in an adjacent
structure.

Since there are currently no (known) implementations of the at91 USBH
IP with more than 2 vbus pins, I am capping the value at 2.  If somebody
tries to assign more, then the compiler will produce a warning.
Signed-off-by: NJustin Waters <justin.waters@timesys.com>
Acked-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Acked-by: NAndrew Victor <linux@maxim.org.za>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This adds a SZ_32K define to the available sizes. I need it for an
upcoming platform support.
Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

A very large subset of SD cards in the market send their
responses and data non-byte-aligned. So add logic to the
mmc spi driver to handle this mess.
Signed-off-by: NWolfgang Muees <wolfgang.mues@auerswald.de>
Signed-off-by: NPierre Ossman <pierre@ossman.eu>

With spurious interrupt cmd can be null even when we have CC
set in irq status.

Fixes: NB#106295 - prevent potential kernel crash in the MMC driver
Signed-off-by: NJarkko Lavinen <jarkko.lavinen@nokia.com>
Signed-off-by: NAdrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: NPierre Ossman <pierre@ossman.eu>

This fixes the issue noted by Russell King:

drivers/mmc/host/omap_hsmmc.c: In function 'mmc_omap_xfer_done':
drivers/mmc/host/omap_hsmmc.c:301: error: implicit declaration of function 'mmc_omap_fclk_lazy_disable'

This got broken by 4a694dc9.
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NPierre Ossman <pierre@ossman.eu>

SD/MMC card timeouts can be very high. So avoid busy-waiting,
using the scheduler. Calculate all timeouts in jiffies units,
because this will give us the correct sign when to involve
the scheduler.
Signed-off-by: NWolfgang Muees <wolfgang.mues@auerswald.de>
Signed-off-by: NPierre Ossman <pierre@ossman.eu>

Some cards are not able to calculate a valid CRC16 value
for CID and CSD reads (CRC for 512 byte data blocks is OK).
By moving the CRC enable after the read of CID and CSD, these
cards can be used. This patch was tested with a faulty 8 GByte
takeMS Class 6 SDHC card. This patch was suggested by
Pierre Ossman.
Signed-off-by: NWolfgang Muees <wolfgang.mues@auerswald.de>
Signed-off-by: NPierre Ossman <pierre@ossman.eu>

Spurious IRQs seen on MMC after 2.6.29.  Flush posted write in IRQ
handler.

The interrupt line is released by clearing the error status bits
in the MMCHS_STAT register, which must occur before the interrupt
handler returns to avoid unwanted irqs.  Hence the need to flush
the posted write.
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NAdrian Hunter <adrian.hunter@nokia.com>
Acked-by: NTony Lindgen <tony@atomide.com>
Signed-off-by: NPierre Ossman <pierre@ossman.eu>

Signed-off-by: NPierre Ossman <pierre@ossman.eu>

DMA request source (RSSR) needs to be set only once (in probe).
DMA burst length (BLR) need to be set only in set_ios()

This cleans up imxmci_setup_data() and should make it a little
bit faster :)
Signed-off-by: NPaulius Zaleckas <paulius.zaleckas@teltonika.lt>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Add __init __exit for appropriate probe and remove functions.
Conver to platform_driver_probe()
Signed-off-by: NPaulius Zaleckas <paulius.zaleckas@teltonika.lt>
Acked-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

Signed-off-by: NJarkko Lavinen <jarkko.lavinen@nokia.com>
Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>

This fixes all the checkpatch --file complaints about kernel/ptrace.c
and also removes an unused #include.  I've verified that there are no
changes to the compiled code on x86_64.
Signed-off-by: NRoland McGrath <roland@redhat.com>
[ Removed the parts that just split a line  - Linus ]
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

6260a4b0 ("/proc/pid/maps: don't show
pgoff of pure ANON VMAs" had a typo.

fs/proc/task_nommu.c:138: error: 'struct vm_area_struct' has no member named 'pg_off'
distcc[21484] ERROR: compile fs/proc/task_nommu.c on sprygo/32 failed
Signed-off-by: NNobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/befs/super.c:85: error: 'PAGE_SIZE' undeclared
Signed-off-by: NAlexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Merge branches 'release', 'APERF', 'ARAT', 'misc', 'kelvin', 'device-lock' and 'bjorn.notify' into release

Add support for Always Running APIC timer, CPUID_0x6_EAX_Bit2.
This bit means the APIC timer continues to run even when CPU is
in deep C-states.

The advantage is that we can use LAPIC timer on these CPUs
always, and there is no need for "slow to read and program"
external timers (HPET/PIT) and the timer broadcast logic
and related code in C-state entry and exit.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Acked-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

Do not write zeroes to APERF and MPERF by ondemand governor. With this
change, other users can share these MSRs for reads.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

Change structure name to make the code cleaner and simpler. No
functionality change in this patch.
Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

Sony laptops apparently write 4-bytes (rather than 1 byte)
to debug port 0x80, which spews error messages:

Denied AML access to port 0x00000080/4 (DMA1 0x0081-0x0083) [20090320]

http://bugzilla.kernel.org/show_bug.cgi?id=13036Signed-off-by: NLen Brown <len.brown@intel.com>

* 'core/softlockup' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  softlockup: make DETECT_HUNG_TASK default depend on DETECT_SOFTLOCKUP
  softlockup: move 'one' to the softlockup section in sysctl.c
  softlockup: ensure the task has been switched out once
  softlockup: remove timestamp checking from hung_task
  softlockup: convert read_lock in hung_task to rcu_read_lock
  softlockup: check all tasks in hung_task
  softlockup: remove unused definition for spawn_softlockup_task
  softlockup: fix potential race in hung_task when resetting timeout
  softlockup: fix to allow compiling with !DETECT_HUNG_TASK
  softlockup: decouple hung tasks check from softlockup detection

Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  branch tracer, intel-iommu: fix build with CONFIG_BRANCH_TRACER=y
  branch tracer: Fix for enabling branch profiling makes sparse unusable
  ftrace: Correct a text align for event format output
  Update /debug/tracing/README
  tracing/ftrace: alloc the started cpumask for the trace file
  tracing, x86: remove duplicated #include
  ftrace: Add check of sched_stopped for probe_sched_wakeup
  function-graph: add proper initialization for init task
  tracing/ftrace: fix missing include string.h
  tracing: fix incorrect return type of ns2usecs()
  tracing: remove CALLER_ADDR2 from wakeup tracer
  blktrace: fix pdu_len when tracing packet command requests
  blktrace: small cleanup in blk_msg_write()
  blktrace: NUL-terminate user space messages
  tracing: move scripts/trace/power.pl to scripts/tracing/power.pl

* 'irq/threaded' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  genirq: fix devres.o build for GENERIC_HARDIRQS=n
  genirq: provide old request_irq() for CONFIG_GENERIC_HARDIRQ=n
  genirq: threaded irq handlers review fixups
  genirq: add support for threaded interrupts to devres
  genirq: add threaded interrupt handler support

Commit c2ec175c ("mm: page_mkwrite
change prototype to match fault") exposed a bug in the NFS
implementation of page_mkwrite.  We should be returning 0 on success...
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
CC: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: NLen Brown <len.brown@intel.com>

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
CC: Mattia Dongili <malattia@linux.it>
Signed-off-by: NLen Brown <len.brown@intel.com>

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
CC: Harald Welte <laforge@gnumonks.org>
Signed-off-by: NLen Brown <len.brown@intel.com>

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.

Tested by Tony on Fujitsu-Siemens Lifebook S6420 [FJNB1E6] with
BIOS 1.18 (01/09/2009).  Tested by Jonathan on Fujitsu S7020.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
Acked-By: NTony Vroon <tony@linx.net>
Tested-By: NTony Vroon <tony@linx.net>
Acked-by: NJonathan Woithe <jwoithe@physics.adelaide.edu.au>
Tested-by: NJonathan Woithe <jwoithe@physics.adelaide.edu.au>
Signed-off-by: NLen Brown <len.brown@intel.com>

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.

Tested by Tony on Fujitsu-Siemens Lifebook S6420 [FJNB1E6] with
BIOS 1.18 (01/09/2009).  Tested by Jonathan on Fujitsu S7020.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
Acked-By: NTony Vroon <tony@linx.net>
Tested-By: NTony Vroon <tony@linx.net>
Acked-by: NJonathan Woithe <jwoithe@physics.adelaide.edu.au>
Tested-by: NJonathan Woithe <jwoithe@physics.adelaide.edu.au>
Signed-off-by: NLen Brown <len.brown@intel.com>

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
CC: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
CC: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>