If no planes are enabled, the self-refresh calculation may end up doing
a divide by zero.  This patch should prevent that by making sure at
least one of the CRTCs had a valid hdisplay value.
Reported-by: NEric Anholt <eric@anholt.net>
Tested-by: NEric Anholt <eric@anholt.net>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NEric Anholt <eric@anholt.net>

If you're pushing a plane hard (i.e. you need most or all of the FIFO
entries just to cover your frame refresh latency), the watermark level
may end up being negative.  So fix up the signed vs. unsigned math in
the calculation function to handle this correctly, giving all available
FIFO entries to such a configuration.
Reported-by: NEric Anholt <eric@anholt.net>
Tested-by: NEric Anholt <eric@anholt.net>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NEric Anholt <eric@anholt.net>

I discovered several bugs in the FIFO code that was recently applied.
Some of them fell into the "how did this ever work" category, since in
some cases we were using the wrong FIFO size values, and the
calculations ended up being way off.

This patch fixes all the bugs I found, and works well on my GM45, 915GM
and 855GM test machines; but as usual with these sorts of patches
broader testing is definitely requested (in particular this patch
affects 830, 845 and 865 for which I don't have test hardware).

Overall, the patch clarifies the watermark calculation function by
adding some comments and debug info, and making the variable names a
bit clearer.  The "get FIFO size" portion of the code has also been
corrected, so we should be able to properly detect the FIFO allocations
for each pipe, for use in the watermark calculation.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NEric Anholt <eric@anholt.net>

This motherboard thinks it has an LVDS connected, so without this
patch the screen goes blank on the connected VGA monitor. More
information (for the non-KMS case) in fd.o bug #18004.
Signed-off-by: NTormod Volden <debian.tormod@gmail.com>
Signed-off-by: NEric Anholt <eric@anholt.net>

The 915 and 945 scanout engines can handle frame buffers up to 4096 pixels
wide. Pre-9xx hardware has an 8192 byte stride limit, and so we leave the
existing 2048 max in place.

I'm not sure why we limit the height to the same value; there's no intrinsic
hardware limit in the scanout engine.
Signed-off-by: NKeith Packard <keithp@keithp.com>
Signed-off-by: NEric Anholt <eric@anholt.net>

This patch refactors the existing error detection and collection code,
placing most of it in i915_handle_error(). Additionally, we introduce a
work queue for scheduling post-crash tasks such as generating a uevent.
Using the uevent facility, userspace should be able to capture a
post-mortem dump for diagnostics.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NBen Gamari <bgamari.foss@gmail.com>
Signed-off-by: NEric Anholt <eric@anholt.net>

Vbios will set lvds register correctly based on
current algorithm for lingle/dual Channel LVDS when
system boot, so we can accept this configuration
directly, regardless of LVDS enable status.

It fixed freedesktop.org bug #22262
Signed-off-by: NFlorian Mickler <florian@mickler.org>
Signed-off-by: NEric Anholt <eric@anholt.net>

* 'kmemleak' of git://linux-arm.org/linux-2.6:
  kmemleak: Remove alloc_bootmem annotations introduced in the past
  kmemleak: Add callbacks to the bootmem allocator
  kmemleak: Allow partial freeing of memory blocks
  kmemleak: Trace the kmalloc_large* functions in slub
  kmemleak: Scan objects allocated during a scanning episode
  kmemleak: Do not acquire scan_mutex in kmemleak_open()
  kmemleak: Remove the reported leaks number limitation
  kmemleak: Add more cond_resched() calls in the scanning thread
  kmemleak: Renice the scanning thread to +10

Fix the following warning:

  fs/afs/dir.c: In function 'afs_d_revalidate':
  fs/afs/dir.c:567: warning: 'fid.vnode' may be used uninitialized in this function
  fs/afs/dir.c:567: warning: 'fid.unique' may be used uninitialized in this function

by marking the 'fid' variable as an uninitialized_var.  The problem is
that gcc doesn't always manage to work out that fid is always set on the
path through the function that uses it.

Cc: linux-afs@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* Remove smp_lock.h from files which don't need it (including some headers!)
* Add smp_lock.h to files which do need it
* Make smp_lock.h include conditional in hardirq.h
  It's needed only for one kernel_locked() usage which is under CONFIG_PREEMPT

  This will make hardirq.h inclusion cheaper for every PREEMPT=n config
  (which includes allmodconfig/allyesconfig, BTW)
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We have found that the current PER_CLEAR_ON_SETID mask on Linux doesn't
include neither ADDR_COMPAT_LAYOUT, nor MMAP_PAGE_ZERO.

The current mask is READ_IMPLIES_EXEC|ADDR_NO_RANDOMIZE.

We believe it is important to add MMAP_PAGE_ZERO, because by using this
personality it is possible to have the first page mapped inside a
process running as setuid root.  This could be used in those scenarios:

 - Exploiting a NULL pointer dereference issue in a setuid root binary
 - Bypassing the mmap_min_addr restrictions of the Linux kernel: by
   running a setuid binary that would drop privileges before giving us
   control back (for instance by loading a user-supplied library), we
   could get the first page mapped in a process we control.  By further
   using mremap and mprotect on this mapping, we can then completely
   bypass the mmap_min_addr restrictions.

Less importantly, we believe ADDR_COMPAT_LAYOUT should also be added
since on x86 32bits it will in practice disable most of the address
space layout randomization (only the stack will remain randomized).
Signed-off-by: NJulien Tinnes <jt@cr0.org>
Signed-off-by: NTavis Ormandy <taviso@sdf.lonestar.org>
Cc: stable@kernel.org
Acked-by: NChristoph Hellwig <hch@infradead.org>
Acked-by: NKees Cook <kees@ubuntu.com>
Acked-by: NEugene Teo <eugene@redhat.com>
[ Shortened lines and fixed whitespace as per Christophs' suggestion ]
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This causes kernel images that don't run init to completion with certain
broken gcc versions.

This fixes kernel bugzilla entry:
	http://bugzilla.kernel.org/show_bug.cgi?id=13012

I suspect the gcc problem is this:
	http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28230

Fix the problem by using the -fno-strict-overflow flag instead, which
not only does not exist in the known-to-be-broken versions of gcc (it
was introduced later than fwrapv), but seems to be much less disturbing
to gcc too: the difference in the generated code by -fno-strict-overflow
are smaller (compared to using neither flag) than when using -fwrapv.
Reported-by: NBarry K. Nathan <barryn@pobox.com>
Pushed-by: NFrans Pop <elendil@planet.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  hwmon: (abituguru3) DMI probing for AB9, AB9 QuadQT and IX38 QuadGT
  hwmon: (sht15) Remove unnecessary semicolon
  hwmon: (max6650) Fix lock imbalance

This reverts commit 097041e5.

Trond had a better fix, which is the parent of this one ("Fix compile
error due to congestion_wait() changes")
Requested-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Move the definition of BLK_RW_ASYNC/BLK_RW_SYNC into linux/backing-dev.h
so that it is available to all callers of set/clear_bdi_congested().

This replaces commit 097041e5 ("fuse:
Fix build error"), which will be reverted.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: NLarry Finger <Larry.Finger@lwfinger.net>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Switch the AB9, AB9 QuadQT and IX38 QuadGT over from port
probing to the preferred DMI probe method.
Signed-off-by: NAlistair John Strachan <alistair@devzero.co.uk>
Tested-by: Ndan <dan@deeog.com>
Tested-by: NNygel Lyndley <nygel.lyndley@gmail.com>
Tested-by: NDmitriy Fedchenko <dmitriy-fedc@yandex.ru>
Acked-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

Add omitted update_lock to one switch/case in set_div.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Acked-by: NHans J. Koch <hjk@linutronix.de>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
  ALSA: hda - targa and targa-2ch fix
  ALSA: hda - fix beep tone calculation for IDT/STAC codecs
  ALSA: hda - Missing volume controls for Intel HDA (ALC269/EeePC)
  ALSA: hda - Disable AMD SB600 64bit address support only
  ALSA: hda - Check widget types while parsing capture source in patch_via.c
  ALSA: hda - Fix capture source selection in patch_via.c
  ALSA: hda - Add missing EAPD initialization for VIA codecs
  ALSA: hda - Clean up VT170x dig-in initialization code
  ALSA: hda - Fix error path in the sanity check in azx_pcm_open()
  ALSA: hda - move 8086:fb30 quirk (stac9205) to the proper section
  ASoC: Fix wm8753 register cache size and initialization
  ASoC: add locking to mpc5200-psc-ac97 driver
  ASoC: Fix mpc5200-psc-ac97 to ensure the data ready bit is cleared
  ASoC: Fix register cache initialisation for WM8753

commit 5404ac8e ("isofs: cleanup mount
option processing") missed conversion of joliet option flag resulting
in non-working Joliet support.

CC: walt <w41ter@gmail.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

PL2303 has private data shovelling methods that also have no fast path. Fix
them to work the same way as the default handler.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The sysrq code acquired a kref leak. Fix it by passing the tty separately
from the caller (thus effectively using the callers kref which all the
callers hold anyway)
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We can't go around calling all sorts of magic per character functions at
full rate 3G data speed.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'linux-next' of git://git.infradead.org/ubi-2.6:
  UBI: fix compilation warnings
  UBI: fix NOR flash recovery
  UBI: nicify image sequence number handling
  UBI: add image sequence number to EC header
  UBI: remove bogus debugging checks
  UBI: add empty eraseblocks verification

* 'linux-next' of git://git.infradead.org/ubifs-2.6:
  UBIFS: fix corruption dump
  UBIFS: clean up free space checking
  UBIFS: small amendments in the LEB scanning code
  UBIFS: dump a little more in case of corruptions
  MAINTAINERS: update ahunter's e-mail address
  UBIFS: allow more than one volume to be mounted
  UBIFS: fix assertion warning
  UBIFS: minor spelling and grammar fixes
  UBIFS: fix 64-bit divisions in debug print
  UBIFS: few spelling fixes
  UBIFS: set write-buffer timout to 3-5 seconds
  UBIFS: slightly optimize write-buffer timer usage
  UBIFS: improve debugging messaged
  UBIFS: fix integer overflow warning

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] define KTIME_SCALAR for 32-bit s390
  [S390] add generic atomic64 support for 31 bit
  [S390] improve suspend/resume error messages
  [S390] set SCHED_OMIT_FRAME_POINTER for s390
  [S390] add __ucmpdi2() helper function
  [S390] perf_counter build fix
  [S390] shutdown actions: save/return rc from init function
  [S390] dasd: correct debugfeature sense dump
  [S390] udelay: disable lockdep to avoid false positives
  [S390] monreader: fix dev_set_drvdata conversion
  [S390] sclp: fix compile error for !SCLP_CONSOLE

* 'for-linus' of git://git.open-osd.org/linux-open-osd:
  osdblk: Adjust queue limits to lower device's limits
  osdblk: a Linux block device for OSD objects
  MAINTAINERS: Add osd maintained files (F:)
  exofs: Avoid using file_fsync()
  exofs: Remove IBM copyrights
  exofs: Fix bio leak in error handling path (sync read)

* 'drm-intel-next' of git://git.kernel.org/pub/scm/linux/kernel/git/anholt/drm-intel: (22 commits)
  drm/i915: Fix for LVDS VBT change on IGDNG
  drm/i915: Zap the GTT mapping when transitioning from untiled to tiled.
  drm/i915: Refactor calls to unmap_mapping_range
  drm/i915: Avoid saving/restore the modesetting registers twice in KMS mode
  drm: Disable the unused connectors explicitly when resuming with KMS.
  drm/i915: Restore the KMS modeset for every activated CRTC
  drm/i915: Fix harmless warning from patch merged after i2c rework.
  drm/i915: Disable GEM when a broken video BIOS takes up the whole aperture.
  drm/i915: Check the LID device to decide whether the LVDS should be initialized
  drm/i915: Move lock to more reasonable location
  drm/i915: Add gtt_offset to gem object list debugfs output
  drm/i915: Remove gtt_bound from drm_i915_gem_object
  drm/i915: Disable VGA output when doing DRM_MODE_DPMS_OFF.
  drm/i915: crt fetch EDID by DVI-I converter on G4x platform
  drm/i915: Don't update display FIFO watermark on IGDNG
  drm/i915: Adjust DisplayPort clocks to use 96MHz reference
  drm/i915: Make driver less chatty
  drm/i915: fix up a raw 64bit divide
  drm/i915: enable sdvo lvds scaling function.
  drm/i915: Set SSC frequency for 8xx chips correctly
  ...

exception.txt only explains the code on x86, so it's better to
move it into Documentation/x86 directory.

And also rename it to exception-tables.txt which looks much
more reasonable.

This patch is on top of the previous one.
Signed-off-by: NWANG Cong <amwang@redhat.com>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Update Documentation/exception.txt.
Remove trailing whitespaces in it.
Signed-off-by: NWANG Cong <amwang@redhat.com>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

When building v2.6.31-rc2-344-g69ca06c9, the following build errors are
found due to missing includes:

 CC [M]  fs/fuse/dev.o
fs/fuse/dev.c: In function ‘request_end’:
fs/fuse/dev.c:289: error: ‘BLK_RW_SYNC’ undeclared (first use in this function)
...
fs/nfs/write.c: In function ‘nfs_set_page_writeback’:
fs/nfs/write.c:207: error: ‘BLK_RW_ASYNC’ undeclared (first use in this function)

Signed-off-by: Larry Finger@lwfinger.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  cfq-iosched: reset oom_cfqq in cfq_set_request()
  block: fix sg SG_DXFER_TO_FROM_DEV regression
  block: call blk_scsi_ioctl_init()
  Fix congestion_wait() sync/async vs read/write confusion

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2:
  nilfs2: fix disorder in cp count on error during deleting checkpoints
  nilfs2: fix lockdep warning between regular file and inode file
  nilfs2: fix incorrect KERN_CRIT messages in case of write failures
  nilfs2: fix hang problem of log writer which occurs after write failures
  nilfs2: remove unlikely directive causing mis-conversion of error code

Merge branch 'core-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  dma-debug: Fix the overlap() function to be correct and readable
  oprofile: reset bt_lost_no_mapping with other stats
  x86/oprofile: rename kernel parameter for architectural perfmon to arch_perfmon
  signals: declare sys_rt_tgsigqueueinfo in syscalls.h
  rcu: Mark Hierarchical RCU no longer experimental
  dma-debug: Put all hash-chain locks into the same lock class
  dma-debug: fix off-by-one error in overlap function

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

* 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (50 commits)
  perf report: Add "Fractal" mode output - support callchains with relative overhead rate
  perf_counter tools: callchains: Manage the cumul hits on the fly
  perf report: Change default callchain parameters
  perf report: Use a modifiable string for default callchain options
  perf report: Warn on callchain output request from non-callchain file
  x86: atomic64: Inline atomic64_read() again
  x86: atomic64: Clean up atomic64_sub_and_test() and atomic64_add_negative()
  x86: atomic64: Improve atomic64_xchg()
  x86: atomic64: Export APIs to modules
  x86: atomic64: Improve atomic64_read()
  x86: atomic64: Code atomic(64)_read and atomic(64)_set in C not CPP
  x86: atomic64: Fix unclean type use in atomic64_xchg()
  x86: atomic64: Make atomic_read() type-safe
  x86: atomic64: Reduce size of functions
  x86: atomic64: Improve atomic64_add_return()
  x86: atomic64: Improve cmpxchg8b()
  x86: atomic64: Improve atomic64_read()
  x86: atomic64: Move the 32-bit atomic64_t implementation to a .c file
  x86: atomic64: The atomic64_t data type should be 8 bytes aligned on 32-bit too
  perf report: Annotate variable initialization
  ...

Optimize cond_resched() by removing one conditional.

Currently cond_resched() checks system_state ==
SYSTEM_RUNNING in order to avoid scheduling before the
scheduler is running.

We can however, as per suggestion of Matt, use
PREEMPT_ACTIVE to accomplish that very same.
Suggested-by: NMatt Mackall <mpm@selenic.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: NMatt Mackall <mpm@selenic.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Pull the initial preempt_count value into a single
definition site.

Maintainers for: alpha, ia64 and m68k, please have a look,
your arch code is funny.

The header magic is a bit odd, but similar to the KERNEL_DS
one, CPP waits with expanding these macros until the
INIT_THREAD_INFO macro itself is expanded, which is in
arch/*/kernel/init_task.c where we've already included
sched.h so we're good.

Cc: tony.luck@intel.com
Cc: rth@twiddle.net
Cc: geert@linux-m68k.org
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: NMatt Mackall <mpm@selenic.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

IGDNG mobile chip's LVDS data block removes panel fitting
register definition. So this fixes offset for LVDS timing
block parsing. Thanks for Michael Fu to catch this.
Signed-off-by: NZhenyu Wang <zhenyu.z.wang@intel.com>
Signed-off-by: NEric Anholt <eric@anholt.net>

As of 52dc7d32, we could leave an old
linear GTT mapping in place, so that apps trying to GTT-mapped write in
tiled data wouldn't get the fence added, and garbage would get displayed.
Signed-off-by: NEric Anholt <eric@anholt.net>

As we call unmap_mapping_range() twice in identical fashion, refactor
and attempt to explain why we need to call unmap_mapping_range().
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NEric Anholt <eric@anholt.net>