This reverts commit 59365d13.

It turns out that this can break certain existing user land setups.
Quoth Sarah Sharp:

 "On Wednesday, I updated my branch to commit 460781b5 from linus' tree,
  and my box would not boot.  klogd segfaulted, which stalled the whole
  system.

  At first I thought it actually hung the box, but it continued booting
  after 5 minutes, and I was able to log in.  It dropped back to the
  text console instead of the graphical bootup display for that period
  of time.  dmesg surprisingly still works.  I've bisected the problem
  down to this commit (commit 59365d13)

  The box is running klogd 1.5.5ubuntu3 (from Jaunty).  Yes, I know
  that's old.  I read the bit in the commit about changing the
  permissions of kallsyms after boot, but if I can't boot that doesn't
  help."

So let's just keep the old default, and encourage distributions to do
the "chmod -r /proc/kallsyms" in their bootup scripts.  This is not
worth a kernel option to change default behavior, since it's so easily
done in user space.
Reported-and-bisected-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Marcus Meissner <meissner@suse.de>
Cc: Tejun Heo <tj@kernel.org>
Cc: Eugene Teo <eugeneteo@kernel.org>
Cc: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: fix typo in keycode validation supporting large scancodes
  Input: aiptek - tighten up permissions on sysfs attributes
  Input: sysrq - pass along lone Alt + SysRq

* 'drm-intel-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel:
  drm/i915: Disable FBC on Ironlake to save 1W
  drm/i915: Take advantage of auto-polling CRT hotplug detection on PCH hardware
  drm/i915/crt: Introduce struct intel_crt
  drm/i915: Do not hold mutex when faulting in user addresses
  drm: radeon: fix error value sign
  drm/radeon/kms: fix and unify tiled buffer alignment checking for r6xx/7xx
  drm/i915: Retire any pending operations on the old scanout when switching
  drm/i915: Fix I2C adapter registration

* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (40 commits)
  drm/radeon/kms: i2c s/sprintf/snprintf/g for safety
  drm/radeon/kms: fix i2c pad masks on rs4xx
  drm/ttm: Fix up a theoretical deadlock
  drm/radeon/kms: fix tiling info on evergreen
  drm/radeon/kms: fix alignment when allocating buffers
  drm/vmwgfx: Fix up an error path during bo creation
  drm/radeon/kms: register an i2c adapter name for the dp aux bus
  drm/radeon/kms/atom: add proper external encoders support
  drm/radeon/kms/atom: cleanup and unify DVO handling
  drm/radeon/kms: properly power up/down the eDP panel as needed (v4)
  drm/radeon/kms/atom: set sane defaults in atombios_get_encoder_mode()
  drm/radeon/kms: turn the backlight off explicitly for dpms
  drm/radeon/kms: fix typo in r600 cs checker
  drm: radeon: fix error value sign
  drm/radeon/kms: fix and unify tiled buffer alignment checking for r6xx/7xx
  nouveau: Acknowledge HPD irq in handler, not bottom half
  drm/nouveau: Fix a few confusions between "chipset" and "card_type".
  drm/nouveau: don't expose backlight control when available through ACPI
  drm/nouveau/pm: improve memtiming mappings
  drm/nouveau: Make PCIE GART size depend on the available RAMIN space.
  ...

Frame buffer compression is broken on Ironlake due to buggy hardware.
Currently it is disabled through chicken bits, but it still consumes
over 1W more than if we simply never attempt to enable the FBC code
paths.
Signed-off-by: NAlex Shi <alex.shi@intel.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org

Both IBX and CPT have an automatic hotplug detection mode which appears to work reliably enough
that we can dispense with the manual force hotplug trigger stuff. This means that
hotplug detection is as simple as reading the current hotplug register values.

The first time the hotplug detection is activated, the code synchronously waits for a hotplug
sequence in case the hardware hasn't bothered to do a detection cycle since being initialized.
Signed-off-by: NKeith Packard <keithp@keithp.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>

We will use this structure in future patches to store CRT specific
information on the encoder.

Split out and tweaked from a patch by Keith Packard.
Signed-off-by: NKeith Packard <keithp@kithp.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>

Linus Torvalds found that it was rather trivial to trigger a system
freeze:

  In fact, with lockdep, I don't even need to do the sysrq-d thing: it
  shows the bug as it happens. It's the X server taking the same lock
  recursively.

  Here's the problem:

    =============================================
    [ INFO: possible recursive locking detected ]
    2.6.37-rc2-00012-gbdbd01ac #7
    ---------------------------------------------
    Xorg/2816 is trying to acquire lock:
     (&dev->struct_mutex){+.+.+.}, at: [<ffffffff812c626c>] i915_gem_fault+0x50/0x17e

    but task is already holding lock:
     (&dev->struct_mutex){+.+.+.}, at: [<ffffffff812c403b>] i915_mutex_lock_interruptible+0x28/0x4a

    other info that might help us debug this:
    2 locks held by Xorg/2816:
     #0:  (&dev->struct_mutex){+.+.+.}, at: [<ffffffff812c403b>] i915_mutex_lock_interruptible+0x28/0x4a
     #1:  (&mm->mmap_sem){++++++}, at: [<ffffffff81022d4f>] page_fault+0x156/0x37b

This recursion was introduced by rearranging the locking to avoid the
double locking on the fast path (4f27b5d and fbd5a26d) and the
introduction of the prefault to encourage the fast paths (b5e4f2b). In
order to undo the problem, we rearrange the code to perform the access
validation upfront, attempt to prefault and then fight for control of the
mutex.  the best case scenario where the mutex is uncontended the
prefaulting is not wasted.
Reported-and-tested-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>

As per advice from Jean Delvare.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Acked-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

These got lost in the last i2c cleanup.  Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=23222Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  [libata] remove SCSI host lock and serial number usage from ata_scsi_queuecmd

Update kernel-doc and Documentation maintainers info.
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Document things that I would've liked to have known when submitting a driver
to gregkh for staging.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This is confusing, as we have "staging" trees for drivers/staging.  Call
them -next trees.
Signed-off-by: NAndres Salomon <dilinger@queued.net>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

My old mail address doesn't exist anymore. This changes all occurrences
to my new address.
Signed-off-by: NHans J. Koch <hjk@hansjkoch.de>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add a bit more information how to use poll(2) on GPIO value files
correctly. For me it was not clear that I need to poll(2) for
POLLPRI|POLLERR or select(2) for exceptfds.
Signed-off-by: NBernhard Walle <walle@corscience.de>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

If "p" is NULL then it will cause an oops when we pass it to
simple_strtoul().  In this case "p" can not be NULL so I removed the
check.  I also changed the check a little to make it more explicit that
we are testing whether p points to the NUL char.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Acked-by: NJoel Becker <joel.becker@oracle.com>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/kernel-doc was leaving unescaped '<', '>', and '&' in
generated xml output for structs.  This causes xml parser errors.
Convert these characters to "&lt;", "&gt;", and "&amp;" as needed
to prevent errors.

Most of the conversion was already done; complete it just before
output.

Documentation/DocBook/device-drivers.xml:41883: parser error : StartTag: invalid element name
#define INPUT_KEYMAP_BY_INDEX	(1 << 0)
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Kernel build fail for cx25821-video has depends on smp_lock.h header
file, but the dependency is removed in recent commit 451a3c24.
Signed-off-by: NYouquan Song <youquan.song@intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This really isn't the right thing to do, and strictly speaking we should
have the BKL depth count in the thread info right next to the preempt
count.  The two really do go together.

However, since that would involve a patch to all architectures, and the
BKL is finally going away, it's simply not worth the effort to do the
RightThing(tm).  Just re-instate the <linux/sched.h> include that we
used to get accidentally from the smp_lock.h one.

This is all fallout from the same old "BKL: remove extraneous #include
<smp_lock.h>" commit.
Reported-by: NIngo Molnar <mingo@elte.hu>
Tested-by: NRandy Dunlap <randy.dunlap@oracle.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: VMX: Fix host userspace gsbase corruption
  KVM: Correct ordering of ldt reload wrt fs/gs reload

Check the input_keymap_entry keycode size (u32) instead of the device's
(void*) when validating that keycode value can be stored in the keymap.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=22722Signed-off-by: NMattia Dongili <malattia@linux.it>
Tested-by: NNorbert Preining <preining@logic.at>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  kgdb,ppc: Fix regression in evr register handling
  kgdb,x86: fix regression in detach handling
  kdb: fix crash when KDB_BASE_CMD_MAX is exceeded
  kdb: fix memory leak in kdb_main.c

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc: Update a BKL related comment
  powerpc/mm: Fix module instruction tlb fault handling on Book-E 64
  powerpc: Fix call to subpage_protection()
  powerpc: Set CONFIG_32BIT on ppc32
  powerpc/mm: Fix build error in setup_initial_memory_limit
  powerpc/pseries: Don't override CONFIG_PPC_PSERIES_DEBUG
  powerpc: Fix div64 in bootloader

A process suspended waiting for a higher sequence or no sequence to unreserve,
a bo may be beaten to the reservation by a process with a lower sequence.
In that case the first process should give up trying to reserve and
return -EAGAIN. In order for that to happen, we must wake waiting processes
when we change sequence, so that they have a chance to detect the new
sequence.
Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

* 'nouveau/for-airlied' of /ssd/git/drm-nouveau-next: (25 commits)
  nouveau: Acknowledge HPD irq in handler, not bottom half
  drm/nouveau: Fix a few confusions between "chipset" and "card_type".
  drm/nouveau: don't expose backlight control when available through ACPI
  drm/nouveau/pm: improve memtiming mappings
  drm/nouveau: Make PCIE GART size depend on the available RAMIN space.
  drm/nouveau: Return error from nouveau_gpuobj_new if we're out of RAMIN.
  drm/nouveau: Fix compilation issues in nouveau_pm when CONFIG_HWMON is not set
  drm/nouveau: Don't use load detection for connector polling.
  drm/nv10-nv20: Fix instability after MPLL changes.
  drm/nv50: implement possible workaround for NV86 PGRAPH TLB flush hang
  drm/nouveau: Don't poll LVDS outputs.
  drm/nouveau: Use "force" to decide if analog load detection is ok or not.
  drm/nv04: Fix scanout over the 16MB mark.
  drm/nouveau: fix nv40 pcie gart size
  drm/nva3: fix overflow in fixed point math used for pll calculation
  drm/nv10: Balance RTs expected to be accessed simultaneously by the 3d engine.
  drm/nouveau: Expose some BO usage flags to userspace.
  drm/nouveau: Reduce severity of the unknown getparam error.
  drm/nouveau: Avoid lock dependency between ramht and ramin spinlocks.
  drm/nouveau: Some random cleanups.
  ...

We aren't currently using tiling in userspace on evergreen,
but the info we currently return for the tiling info query
(gb_addr_config) is no adequate for userspace tiling alignment
calculations.  It does not contain the bank info.  Create a custom
tiling info dword with all the necessary info (num channels,
num banks, group size, row size).
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

We were previously dropping alignment requests on the floor
when allocating buffers so we always ended up page aligned.
Certain tiling modes on 6xx+ require larger alignment which
wasn't happening before.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Cc: Jerome Glisse <j.glisse@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

This causes the connector to not be added since i2c init fails
for the adapter.  Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=31688

Noticed by Ari Savolainen.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Cc: Ari Savolainen <ari.m.savolainen@gmail.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

These are external encoder chips connected via DVO or DP.
The actual external encoder programming is handled by the
kms encoder functions for primary encoder.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Handle all the various asic family specific things for DVO.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

The eDP panel must be powered up for aux transactions, so power it
up for detect and mode probe functions, otherwise power it up or
down based on dpms.

v2:
- only mess with eDP panel on DCE4+
- only mess with eDP panel on eDP connectors, not all DP connectors
v3:
- be extra careful to only mess with eDP panels on eDP connectors
v4:
- avoid possible null derefernce if a connector has not been
assigned to the encoder
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

If there was no connector mapped to the encoder, atombios_get_encoder_mode()
returned 0 which is the id for DP.  Return something sane instead based on
the encoder id.  This avoids hitting the DP paths on non-DP encoders.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

Seems some newer systems require this explicitly.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Looks like a typo in:
drm/radeon/r600: fix tiling issues in CS checker.
(f30df2fa)
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

enable_vblank implementations should use negative result to indicate error.
radeon_enable_vblank() returns EINVAL in this case.  Change this to -EINVAL.
Signed-off-by: NVasiliy Kulikov <segoon@openwall.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Tiled buffers have the same alignment requirements regardless of
whether the surface is for db, cb, or textures.  Previously, the
calculations where inconsistent for each buffer type.

- Unify the alignment calculations in a common function
- Standardize the alignment units (pixels for pitch/height/depth,
bytes for base)
- properly check the buffer base alignments
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

The old code generated an interrupt storm bad enough to completely
take down my system.
Signed-off-by: NAndy Lutomirski <luto@mit.edu>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NFrancisco Jerez <currojerez@riseup.net>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>