flush_cache_mm() is called in two cases:
1. when a process exits, just before the page tables are torn down.
   We can allow the stale lines to evict themselves over time without
   causing any harm.

2. when a process forks, and we've allocated a new ASID.
   The instruction cache issues are dealt with as pages are brought
   into the new process address space.  Flushing the I-cache here is
   therefore unnecessary.

However, we must keep the VIPT aliasing D-cache flush to ensure that
any dirty cache lines are not written back after the pages have been
reallocated for some other use - which would result in corruption.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

The I and D caches for copy-on-write pages on processors with
write-allocate caches become incoherent causing problems on application
relying on CoW for text pages (dynamic linker relocating symbols in a
text page). This patch flushes the D-cache for such pages.

Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Both call sites for __flush_dcache_page() end up calling
__flush_icache_all() themselves, so having __flush_dcache_page() do
this as well is wasteful.  Remove the duplicated icache flushing.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

The zero page is read-only, and has its cache state cleared during
boot.  No further maintanence for this page is required.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

page_address() is a function call rather than a macro, and so:

	if (page_address(page))
		do_something(page_address(page));

results in two calls to this function.  This is unnecessary; remove
the duplication.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

We had two copies of the wrapper code for VIVT cache flushing - one in
asm/cacheflush.h and one in arch/arm/mm/flush.c.  Reduce this down to
one common copy.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

* 'security' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6:
  mac80211: fix spurious delBA handling
  mac80211: fix two remote exploits

* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6:
  [SCSI] fix crash when disconnecting usb storage
  [SCSI] fix async scan add/remove race resulting in an oops
  [SCSI] sd: Return correct error code for DIF

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: gcm - fix another complete call in complete fuction
  crypto: padlock-aes - Use the correct mask when checking whether copying is required

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin:
  Blackfin: fix SMP build error in start_thread()
  Blackfin: fix memset in smp_send_reschedule() and -stop()
  Blackfin: fix typo in ptrace poking
  Blackfin: check for anomaly 05000475
  Blackfin: work around testset anomaly 05000477
  Blackfin: update anomaly lists
  Blackfin: fix cache Kconfig typo
  Blackfin: fix suspend/resume failure with some on-chip ROMs

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  [CIFS] Fix sparse warning
  [CIFS] Duplicate data on appending to some Samba servers
  [CIFS] fix oops in cifs_lookup during net boot

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  at24: Use timeout also for read
  i2c: Fix userspace_device list corruption
  MAINTAINERS: Add missing i2c files
  i2c/tsl2550: Fix lux value in extended mode

* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm:
  [ARM] Update mach-types
  ARM: 5793/1: ARM: Check put_user fail in do_signal when enable OABI_COMPAT
  MAINTAINERS: add maintainer information for AMBA primecell drivers
  [ARM] pxa/spitz: fix compile regression on spitz
  ARM: PNX4008: i2c-pnx: use the same dev_id for request_irq and free_irq
  [ARM] pxa/cpufreq: fix index assignments for end marker
  ARM: PNX4008: fix watchdog device driver name
  [ARM] kmap: fix build errors with DEBUG_HIGHMEM enabled

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc: Fix DEBUG_HIGHMEM build break from d4515646

Code was added to mm/higmem.c that depends on several
kmap types that powerpc does not support.  We add dummy
invalid definitions for KM_NMI, KM_NM_PTE, and KM_IRQ_PTE.

According to list discussion, this fix should not be needed
anymore starting with 2.6.33.  The code is commented to this
effect so hopefully we will remember to remove this.
Signed-off-by: NBecky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6:
  ide: fix ioctl to pass requested transfer mode to ide_find_dma_mode instead of UDMA6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sunsu: Use sunserial_console_termios() in sunsu_console_setup().
  sunsu: Pass true 'ignore_line' to console match when RSC or LOM console.
  serial: suncore: Fix RSC/LOM handling in sunserial_console_termios().
  serial: suncore: Add 'ignore_line' argument to sunserial_console_match().
  sunsu: Fix detection of SU ports which are RSC console or control.
  sunsab: Do not set sunsab_reg.cons right before registering minors.
  sparc64: Fix definition of VMEMMAP_SIZE.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (42 commits)
  b44: Fix wedge when using netconsole.
  wan: cosa: drop chan->wsem on error path
  ep93xx-eth: check for zero MAC address on probe, not on device open
  NET: smc91x: Fix irq flags
  smsc9420: prevent BUG() if ethtool is called with interface down
  r8169: restore mac addr in rtl8169_remove_one and rtl_shutdown
  ipv4: additional update of dev_net(dev) to struct *net in ip_fragment.c, NULL ptr OOPS
  e100: Use pci pool to work around GFP_ATOMIC order 5 memory allocation failure
  sctp: on T3_RTX retransmit all the in-flight chunks
  pktgen: Fix netdevice unregister
  macvlan: fix gso_max_size setting
  rfkill: fix miscdev ops
  ath9k: set ps_default as false
  hso: fix soft-lockup
  hso: fix debug routines
  pktgen: Fix device name compares
  stmmac: do not fail when the timer cannot be used.
  stmmac: fixed a compilation error when use the external timer
  netfilter: xt_limit: fix invalid return code in limit_mt_check()
  Au1x00: fix crash when trying register_netdev()
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: reject O_DIRECT flag also in fuse_create

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: keyboard - fix braille keyboard keysym generation

* 'pm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6:
  PM: fix irq enable/disable in runtime PM code

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: ohci: pass correct iso xmit timestamps to core
  firewire: ohci: Make cycleMatch ISO transmission work

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6:
  V4L/DVB (13372): staging/go7007: fix mutex function usage for s2250
  staging/go7007: Fix compilation by re-adding the missing s2250-loader.h
  V4L/DVB (13530): Fix wrong parameter order in memset
  V4L/DVB (13481): sh_mobile_ceu_camera: fix compile warning
  V4L/DVB (13436): cxusb: Fix hang on DViCO FusionHDTV DVB-T Dual Digital 4 (rev 1)
  V4L/DVB (13412): SMS_SIANO_MDTV should depend on HAS_DMA
  V4L/DVB (13372a): MAINTAINERS: addition of gspca_gl860 driver
  V4L/DVB (13371): davinci: remove stray duplicate config pointer
  V4L/DVB (13366): em28xx: fix Reddo DVB-C USB TV Box GPIO
  V4L/DVB (13345): soc-camera: sh_mobile_ceu_camera: call pm_runtime_disable
  V4L/DVB (13344): soc-camera: properly initialise the device object when reusing
  V4L/DVB (13343): v4l: add more missing linux/sched.h includes
  V4L/DVB (13321): radio-gemtek-pci: fix double mutex_lock

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/anholt/drm-intel:
  drm/i915: Select CONFIG_SHMEM
  drm/i915: Fix CRT hotplug detect by checking really no channels attached
  agp/intel: new host bridge support
  drm/i915: Add more registers save/restore for Ironlake suspend
  drm/i915: Fix IRQ stall issue on Ironlake
  drm/i915: HDMI hardware workaround for Ironlake
  drm/i915: Fix and cleanup DPLL calculation for Ironlake
  drm/i915: Avoid potential sleep whilst holding spinlock

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  cciss: make device attrs static
  Thaw refrigerated bdi flusher threads before invoking kthread_stop on them

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
  acerhdf: return temperature in milidegree instead of degree
  thinkpad-acpi: fix detection of old ThinkPads
  thinkpad-acpi: fix sign of ERESTARTSYS return
  ACPI: Add Thinkpad T400, T500 to OSI(Linux) white-list
  ACPICA: Silence the warning about _BIF returning the buffer
  ACPI: DMI init_set_sci_en_on_resume for HP-Compaq C700

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] Enable ACPI PDC handshake for VIA/Centaur CPUs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
  ALSA: AACI: fix recording bug
  ALSA: AACI: fix AC97 multiple-open bug
  ASoC: AIC23: Fixing infinite loop in resume path
  ASoC: Fix suspend with active audio streams

* 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/fb: fix FBIOGET/PUT_VSCREENINFO pixel clock handling
  drm: make sure page protections are updated after changing vm_flags
  drm/radeon/kms: Report vga connector is connected according to ddc_probe
  drm: mm always protect change to unused_nodes with unused_lock spinlock
  drm/radeon/kms: Disable TV load detect on RS400,RC410,RS480
  drm/radeon/kms: read back register before writing in IIO.
  drm/radeon/kms: fix handling of d1/d2 vga
  drm: work around EDIDs with bad htotal/vtotal values
  drm/radeon/kms: resume AGP by calling init.

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx:
  shdma: fix initialization error handling
  ioat3: fix pq completion versus channel deallocation race
  async_tx: build-time toggling of async_{syndrome,xor}_val dma support
  dmaengine: include xor/pq validate in device_has_all_tx_types()
  ioat2,3: report all uncorrectable errors
  ioat3: specify valid address for disabled-Q or disabled-P
  ioat2,3: disable asynchronous error notifications
  ioat3: dca and raid operations are incompatible
  ioat: silence "dca disabled" messages

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  Staging: octeon-ethernet: Assign proper MAC addresses.
  Staging: Octeon: Use symbolic values for irq numbers.
  MIPS: Octeon: Fix compile error in drivers/staging/octeon/ethernet-mdio.c

In 2.6.23 kernel, commit a32ea1e1
("Fix read/truncate race") fixed a race in the generic code, and as a
side effect, now do_generic_file_read() can ask us to readpage() past
the i_size. This seems to be correctly handled by the block routines
(e.g. block_read_full_page() fills the page with zeroes in case if
somebody is trying to read past the last inode's block).

JFFS2 doesn't handle this; it assumes that it won't be asked to read
pages which don't exist -- and thus that there will be at least _one_
valid 'frag' on the page it's being asked to read. It will fill any
holes with the following memset:

  memset(buf, 0, min(end, frag->ofs + frag->size) - offset);

When the 'closest smaller match' returned by jffs2_lookup_node_frag() is
actually on a previous page and ends before 'offset', that results in:

  memset(buf, 0, <huge unsigned negative>);

Hopefully, in most cases the corruption is fatal, and quickly causing
random oopses, like this:

  root@10.0.0.4:~/ltp-fs-20090531# ./testcases/kernel/fs/ftest/ftest01
  Unable to handle kernel paging request for data at address 0x00000008
  Faulting instruction address: 0xc01cd980
  Oops: Kernel access of bad area, sig: 11 [#1]
  [...]
  NIP [c01cd980] rb_insert_color+0x38/0x184
  LR [c0043978] enqueue_hrtimer+0x88/0xc4
  Call Trace:
  [c6c63b60] [c004f9a8] tick_sched_timer+0xa0/0xe4 (unreliable)
  [c6c63b80] [c0043978] enqueue_hrtimer+0x88/0xc4
  [c6c63b90] [c0043a48] __run_hrtimer+0x94/0xbc
  [c6c63bb0] [c0044628] hrtimer_interrupt+0x140/0x2b8
  [c6c63c10] [c000f8e8] timer_interrupt+0x13c/0x254
  [c6c63c30] [c001352c] ret_from_except+0x0/0x14
  --- Exception: 901 at memset+0x38/0x5c
      LR = jffs2_read_inode_range+0x144/0x17c
  [c6c63cf0] [00000000] (null) (unreliable)

This patch fixes the issue, plus fixes all LTP tests on NAND/UBI with
JFFS2 filesystem that were failing since 2.6.23 (seems like the bug
above also broke the truncation).
Reported-By: NAnton Vorontsov <avorontsov@ru.mvista.com>
Tested-By: NAnton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The fbdev mailing lists at SourceForge have been migrated to a single
mailing list at kernel.org: linux-fbdev@vger.kernel.org.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-kconfig:
  kconfig: Fix make O=<dir> local{mod,yes}config

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  sata_fsl: Split hard and soft reset

* git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-fscache: (31 commits)
  FS-Cache: Provide nop fscache_stat_d() if CONFIG_FSCACHE_STATS=n
  SLOW_WORK: Fix GFS2 to #include <linux/module.h> before using THIS_MODULE
  SLOW_WORK: Fix CIFS to pass THIS_MODULE to slow_work_register_user()
  CacheFiles: Don't log lookup/create failing with ENOBUFS
  CacheFiles: Catch an overly long wait for an old active object
  CacheFiles: Better showing of debugging information in active object problems
  CacheFiles: Mark parent directory locks as I_MUTEX_PARENT to keep lockdep happy
  CacheFiles: Handle truncate unlocking the page we're reading
  CacheFiles: Don't write a full page if there's only a partial page to cache
  FS-Cache: Actually requeue an object when requested
  FS-Cache: Start processing an object's operations on that object's death
  FS-Cache: Make sure FSCACHE_COOKIE_LOOKING_UP cleared on lookup failure
  FS-Cache: Add a retirement stat counter
  FS-Cache: Handle pages pending storage that get evicted under OOM conditions
  FS-Cache: Handle read request vs lookup, creation or other cache failure
  FS-Cache: Don't delete pending pages from the page-store tracking tree
  FS-Cache: Fix lock misorder in fscache_write_op()
  FS-Cache: The object-available state can't rely on the cookie to be available
  FS-Cache: Permit cache retrieval ops to be interrupted in the initial wait phase
  FS-Cache: Use radix tree preload correctly in tracking of pages to be stored
  ...

Fix mutex function usage, which was overlooked in a previous patch.
Signed-off-by: NPete Eberlein <pete@sensoray.com>
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>