Jag Raman says:

====================
sparc64: LDC changes for porting VCC driver into upstream kernel

This series of patches is part of an effort to add VCC (Virtual Console
Concentrator) support to Linux.

VCC enables the virtualization of serial console on SPARC processors. VCC
provides access to the guest domain's serial console.

VCC depends on some core functionalities in the linux kernel for SPARC. The
functionalities include LDC (Logical Domain Channels), MDESC (Machine
Descriptor) and VIO (Virtual IO protocol). In order for VCC to be enabled,
it requires that these core functionalities support them.

This series of patches adds LDC support to enable VCC on Linux. It
is the first batch of changes to enable VCC.

This version 4 of the series addresses the following changes
suggested by Dave Miller
Patch 1/5: Modifies ldc_print/__ldc_print to print caller name. Fixes
           indentation of wrapped lines.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Print debug messages when reading from given LDC channel.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Orabug: 20902628

When an ldc control-only packet is received during data exchange in
read_nonraw(), a new rx head is calculated but the rx queue head is not
actually advanced (rx_set_head() is not called) and a branch is taken to
'no_data' at which point two things can happen depending on the value
of the newly calculated rx head and the current rx tail:

- If the rx queue is determined to be not empty, then the wrong packet
  is picked up.

- If the rx queue is determined to be empty, then a read error (EAGAIN)
  is eventually returned since it is falsely assumed that more data was
  expected.

The fix is to update the rx head and return in case of a control only
packet during data exchange.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Ensure that LDC channel is up before writing to it, in RAW mode. Generate
event to bring the LDC channel up, if it's not up already.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Enhance ldc_abort to accept a message to be printed when it is called. Add
a macro, LDC_ABORT, to print info. about the function that calls ldc_abort.
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add the following LDC APIs which are planned to be used by
LDC clients in the future:
- ldc_set_state: Sets given LDC channel to given state
- ldc_mode: Returns the mode of given LDC channel
- ldc_print: Prints info about given LDC channel
- ldc_rx_reset: Reset the RX queue of given LDC channel
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull UFS fixes from Al Viro:
 "This is just the obvious backport fodder; I'm pretty sure that there
  will be more - definitely so wrt performance and quite possibly
  correctness as well"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ufs: we need to sync inode before freeing it
  excessive checks in ufs_write_failed() and ufs_evict_inode()
  ufs_getfrag_block(): we only grab ->truncate_mutex on block creation path
  ufs_extend_tail(): fix the braino in calling conventions of ufs_new_fragments()
  ufs: set correct ->s_maxsize
  ufs: restore maintaining ->i_blocks
  fix ufs_isblockset()
  ufs: restore proper tail allocation

Pull btrfs fixes from Chris Mason:
 "Some fixes that Dave Sterba collected.

  We've been hitting an early enospc problem on production machines that
  Omar tracked down to an old int->u64 mistake. I waited a bit on this
  pull to make sure it was really the problem from production, but it's
  on ~2100 hosts now and I think we're good.

  Omar also noticed a commit in the queue would make new early ENOSPC
  problems. I pulled that out for now, which is why the top three
  commits are younger than the rest.

  Otherwise these are all fixes, some explaining very old bugs that
  we've been poking at for a while"

* 'for-linus-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: fix delalloc accounting leak caused by u32 overflow
  Btrfs: clear EXTENT_DEFRAG bits in finish_ordered_io
  btrfs: tree-log.c: Wrong printk information about namelen
  btrfs: fix race with relocation recovery and fs_root setup
  btrfs: fix memory leak in update_space_info failure path
  btrfs: use correct types for page indices in btrfs_page_exists_in_range
  btrfs: fix incorrect error return ret being passed to mapping_set_error
  btrfs: Make flush bios explicitely sync
  btrfs: fiemap: Cache and merge fiemap extent before submit it to user

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: a Geode fix plus a microcode loader fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/microcode/intel: Clear patch pointer before jettisoning the initrd
  x86/cpu/cyrix: Add alternative Device ID of Geode GX1 SoC

Pull CPU hotplug fix from Ingo Molnar:
 "An error handling corner case fix"

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Drop the device lock on error

Pull RCU fixes from Ingo Molnar:
 "Fix an SRCU bug affecting KVM IRQ injection"

* 'rcu-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  srcu: Allow use of Classic SRCU from both process and interrupt context
  srcu: Allow use of Tiny/Tree SRCU from both process and interrupt context

Pull perf fixes from Ingo Molnar:
 "This is mostly tooling fixes, plus an instruction pointer filtering
  fix.

  It's more fixes than usual - Arnaldo got back from a longer vacation
  and there was a backlog"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
  perf symbols: Kill dso__build_id_is_kmod()
  perf symbols: Keep DSO->symtab_type after decompress
  perf tests: Decompress kernel module before objdump
  perf tools: Consolidate error path in __open_dso()
  perf tools: Decompress kernel module when reading DSO data
  perf annotate: Use dso__decompress_kmodule_path()
  perf tools: Introduce dso__decompress_kmodule_{fd,path}
  perf tools: Fix a memory leak in __open_dso()
  perf annotate: Fix symbolic link of build-id cache
  perf/core: Drop kernel samples even though :u is specified
  perf script python: Remove dups in documentation examples
  perf script python: Updated trace_unhandled() signature
  perf script python: Fix wrong code snippets in documentation
  perf script: Fix documentation errors
  perf script: Fix outdated comment for perf-trace-python
  perf probe: Fix examples section of documentation
  perf report: Ensure the perf DSO mapping matches what libdw sees
  perf report: Include partial stacks unwound with libdw
  perf annotate: Add missing powerpc triplet
  perf test: Disable breakpoint signal tests for powerpc
  ...

Pull EFI fix from Ingo Molnar:
 "A boot crash fix for certain systems where the kernel would trust a
  piece of firmware data it should not have"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi: Fix boot panic because of invalid BGRT image address

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Pull IOMMU fixes from Joerg Roedel:

 - another compile-fix for my header cleanup

 - a couple of fixes for the recently merged IOMMU probe deferal code

 - fixes for ACPI/IORT code necessary with IOMMU probe deferal

* tag 'iommu-fixes-v4.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  arm: dma-mapping: Reset the device's dma_ops
  ACPI/IORT: Move the check to get iommu_ops from translated fwspec
  ARM: dma-mapping: Don't tear down third-party mappings
  ACPI/IORT: Ignore all errors except EPROBE_DEFER
  iommu/of: Ignore all errors except EPROBE_DEFER
  iommu/of: Fix check for returning EPROBE_DEFER
  iommu/dma: Fix function declaration

Pull input fixes from Dmitry Torokhov:

 - mark "guest" RMI device as pass-through port to avoid "phantom" ALPS
   toouchpad on newer Lenovo Carbons

 - add two more laptops to the Elantech's lists of devices using CRC
   mode

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: synaptics-rmi4 - register F03 port as pass-through serio
  Input: elantech - add Fujitsu Lifebook E546/E557 to force crc_enabled

Pull MD bugfix from Shaohua Li:
 "One bug fix from Neil Brown for MD. The bug was introduced in this
  cycle"

* tag 'md/4.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
  md: initialise ->writes_pending in personality modules.

Pull block fixes from Jens Axboe:
 "A set of fixes in the area of block IO, that should go into the next
  -rc release. This contains:

   - An OOPS fix from Dmitry, fixing a regression with the bio integrity
     code in this series.

   - Fix truncation of elevator io context cache name, from Eric
     Biggers.

   - NVMe pull from Christoph includes FC fixes from James, APST
     fixes/tweaks from Kai-Heng, removal fix from Rakesh, and an RDMA
     fix from Sagi.

   - Two tweaks for the block throttling code. One from Joseph Qi,
     fixing an oops from the timer code, and one from Shaohua, improving
     the behavior on rotatonal storage.

   - Two blk-mq fixes from Ming, fixing corner cases with the direct
     issue code.

   - Locking fix for bfq cgroups from Paolo"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block, bfq: access and cache blkg data only when safe
  Fix loop device flush before configure v3
  blk-throttle: set default latency baseline for harddisk
  blk-throttle: fix NULL pointer dereference in throtl_schedule_pending_timer
  nvme: relax APST default max latency to 100ms
  nvme: only consider exit latency when choosing useful non-op power states
  nvme-fc: fix missing put reference on controller create failure
  nvme-fc: on lldd/transport io error, terminate association
  nvme-rdma: fast fail incoming requests while we reconnect
  nvme-pci: fix multiple ctrl removal scheduling
  nvme: fix hang in remove path
  elevator: fix truncation of icq_cache_name
  blk-mq: fix direct issue
  blk-mq: pass correct hctx to blk_mq_try_issue_directly
  bio-integrity: Do not allocate integrity context for bio w/o data

Pull sound fixes from Takashi Iwai:
 "This update contains a slightly hight amount of changes due to the
  pending ASoC fixes:

   - ALSA timer core got a couple of fixes for races between read and
     ioctl, leading to potential read of uninitialized kmalloced memory

   - ASoC core fixed the de-registration pattern for use-after-free bug

   - The rewrite of probe code in ASoC Intel Skylake for i915 component

   - ASoC R-snd got a series of fixes for SSI

   - ASoC simple-card, atmel, da7213, and rt286 trivial fixes

   - HD-audio ALC269 quirk and rearrangement of quirk table"

* tag 'sound-4.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: timer: Fix missing queue indices reset at SNDRV_TIMER_IOCTL_SELECT
  ALSA: timer: Fix race between read and ioctl
  ALSA: hda/realtek - Reorder ALC269 ASUS quirk entries
  ALSA: hda/realtek: Fix mic and headset jack sense on Asus X705UD
  ASoC: rsnd: fixup parent_clk_name of AUDIO_CLKOUTx
  ASoC: Intel: Skylake: Fix to parse consecutive string tkns in manifest
  ASoC: Intel: Skylake: Fix IPC rx_list corruption
  ASoC: rsnd: SSI PIO adjust to 24bit mode
  MAINTAINERS: Update email address for patches to Wolfson parts
  ASoC: Fix use-after-free at card unregistration
  ASoC: simple-card: fix mic jack initialization
  ASoC: rsnd: don't call free_irq() on Parent SSI
  ASoC: atmel-classd: sync regcache when resuming
  ASoC: rsnd: don't use PDTA bit for 24bit on SSI
  ASoC: da7213: Fix incorrect usage of bitwise '&' operator for SRM check
  rt286: add Thinkpad Helix 2 to force_combo_jack_table
  ASoC: Intel: Skylake: Move i915 registration to worker thread

Pull drm fixes from Dave Airlie:
 "Intel, nouveau, rockchip, vmwgfx, imx, meson, mediatek and core fixes.

  Bit more spread out fixes this time, fixes for 7 drivers + a couple of
  core fixes.

  i915 and vmwgfx are the main ones. The vmwgfx ones fix a bunch of
  regressions in their atomic rework, and a few fixes destined for
  stable. i915 has some 4.12 regressions and older things that need to
  be fixed in stable as well.

  nouveau also has some runtime pm fixes and a timer list handling fix,
  otherwise a couple of core and small driver regression fixes"

* tag 'drm-fixes-for-v4.12-rc5' of git://people.freedesktop.org/~airlied/linux: (37 commits)
  drm/i915: fix warning for unused variable
  drm/meson: Fix driver bind when only CVBS is available
  drm/i915: Fix 90/270 rotated coordinates for FBC
  drm/i915: Restore has_fbc=1 for ILK-M
  drm/i915: Workaround VLV/CHV DSI scanline counter hardware fail
  drm/i915: Fix logical inversion for gen4 quirking
  drm/i915: Guard against i915_ggtt_disable_guc() being invoked unconditionally
  drm/i915: Always recompute watermarks when distrust_bios_wm is set, v2.
  drm/i915: Prevent the system suspend complete optimization
  drm/i915/psr: disable psr2 for resolution greater than 32X20
  drm/i915: Hold a wakeref for probing the ring registers
  drm/i915: Short-circuit i915_gem_wait_for_idle() if already idle
  drm/i915: Disable decoupled MMIO
  drm/i915/guc: Remove stale comment for q_fail
  drm/vmwgfx: Bump driver minor and date
  drm/vmwgfx: Remove unused legacy cursor functions
  drm/vmwgfx: fix spelling mistake "exeeds" -> "exceeds"
  drm/vmwgfx: Fix large topology crash
  drm/vmwgfx: Make sure to update STDU when FB is updated
  drm/vmwgfx: Make sure backup_handle is always valid
  ...

As it is, short copy in write() to append-only file will fail
to truncate the excessive allocated blocks.  As the matter of
fact, all checks in ufs_truncate_blocks() are either redundant
or wrong for that caller.  As for the only other caller
(ufs_evict_inode()), we only need the file type checks there.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

... and it really needs splitting into "new" and "extend" cases, but that's for
later

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

btrfs_calc_trans_metadata_size() does an unsigned 32-bit multiplication,
which can overflow if num_items >= 4 GB / (nodesize * BTRFS_MAX_LEVEL * 2).
For a nodesize of 16kB, this overflow happens at 16k items. Usually,
num_items is a small constant passed to btrfs_start_transaction(), but
we also use btrfs_calc_trans_metadata_size() for metadata reservations
for extent items in btrfs_delalloc_{reserve,release}_metadata().

In drop_outstanding_extents(), num_items is calculated as
inode->reserved_extents - inode->outstanding_extents. The difference
between these two counters is usually small, but if many delalloc
extents are reserved and then the outstanding extents are merged in
btrfs_merge_extent_hook(), the difference can become large enough to
overflow in btrfs_calc_trans_metadata_size().

The overflow manifests itself as a leak of a multiple of 4 GB in
delalloc_block_rsv and the metadata bytes_may_use counter. This in turn
can cause early ENOSPC errors. Additionally, these WARN_ONs in
extent-tree.c will be hit when unmounting:

    WARN_ON(fs_info->delalloc_block_rsv.size > 0);
    WARN_ON(fs_info->delalloc_block_rsv.reserved > 0);
    WARN_ON(space_info->bytes_pinned > 0 ||
            space_info->bytes_reserved > 0 ||
            space_info->bytes_may_use > 0);

Fix it by casting nodesize to a u64 so that
btrfs_calc_trans_metadata_size() does a full 64-bit multiplication.
While we're here, do the same in btrfs_calc_trunc_metadata_size(); this
can't overflow with any existing uses, but it's better to be safe here
than have another hard-to-debug problem later on.

Cc: stable@vger.kernel.org
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

Before this, we use 'filled' mode here, ie. if all range has been
filled with EXTENT_DEFRAG bits, get to clear it, but if the defrag
range joins the adjacent delalloc range, then we'll have EXTENT_DEFRAG
bits in extent_state until releasing this inode's pages, and that
prevents extent_data from being freed.

This clears the bit if any was found within the ordered extent.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

In verify_dir_item, it wants to printk name_len of dir_item but
printk data_len acutally.

Fix it by calling btrfs_dir_name_len instead of btrfs_dir_data_len.
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

Pull xen fix from Juergen Gross:
 "A fix for Xen on ARM when dealing with 64kB page size of a guest"

* tag 'for-linus-4.12b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/privcmd: Support correctly 64KB page granularity when mapping memory

The 5th generation Thinkpad X1 Carbons use Synaptics touchpads accessible
over SMBus/RMI, combined with ALPS or Elantech trackpoint devices instead
of classic IBM/Lenovo trackpoints. Unfortunately there is no way for ALPS
driver to detect whether it is dealing with touchpad + trackpoint
combination or just a trackpoint, so we end up with a "phantom" dualpoint
ALPS device in addition to real touchpad and trackpoint.

Given that we do not have any special advanced handling for ALPS or
Elantech trackpoints (unlike IBM trackpoints that have separate driver and
a host of options) we are better off keeping the trackpoints in PS/2
emulation mode. We achieve that by setting serio type to SERIO_PS_PSTHRU,
which will limit number of protocols psmouse driver will try. In addition
to getting rid of the "phantom" touchpads, this will also speed up probing
of F03 pass-through port.
Reported-by: Damjan Georgievski <gdamjan@gmail.com>
Suggested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Pull powerpc fixes from Michael Ellerman:
 "Mostly fairly minor, of note are:

   - Fix percpu allocations to be NUMA aware

   - Limit 4k page size config to 64TB virtual address space

   - Avoid needlessly restoring FP and vector registers

  Thanks to Aneesh Kumar K.V, Breno Leitao, Christophe Leroy, Frederic
  Barrat, Madhavan Srinivasan, Michael Bringmann, Nicholas Piggin,
  Vaibhav Jain"

* tag 'powerpc-4.12-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/book3s64: Move PPC_DT_CPU_FTRs and enable it by default
  powerpc/mm/4k: Limit 4k page size config to 64TB virtual address space
  cxl: Fix error path on bad ioctl
  powerpc/perf: Fix Power9 test_adder fields
  powerpc/numa: Fix percpu allocations to be NUMA aware
  cxl: Avoid double free_irq() for psl,slice interrupts
  powerpc/kernel: Initialize load_tm on task creation
  powerpc/kernel: Fix FP and vector register restoration
  powerpc/64: Reclaim CPU_FTR_SUBCORE
  powerpc/hotplug-mem: Fix missing endian conversion of aa_index
  powerpc/sysdev/simple_gpio: Fix oops in gpio save_regs function
  powerpc/spufs: Fix coredump of SPU contexts
  powerpc/64s: Add dt_cpu_ftrs boot time setup option

Pull ARM SoC fixes from Olof Johansson:
 "Been sitting on these for a couple of weeks waiting on some larger
  batches to come in but it's been pretty quiet.

  Just your garden variety fixes here:

   - A few maintainers updates (ep93xx, Exynos, TI, Marvell)
   - Some PM fixes for Atmel/at91 and Marvell
   - A few DT fixes for Marvell, Versatile, TI Keystone, bcm283x
   - A reset driver patch to set module license for symbol access"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  MAINTAINERS: EP93XX: Update maintainership
  MAINTAINERS: remove kernel@stlinux.com obsolete mailing list
  ARM: dts: versatile: use #include "..." to include local DT
  MAINTAINERS: add device-tree files to TI DaVinci entry
  ARM: at91: select CONFIG_ARM_CPU_SUSPEND
  ARM: dts: keystone-k2l: fix broken Ethernet due to disabled OSR
  arm64: defconfig: enable some core options for 64bit Rockchip socs
  arm64: marvell: dts: fix interrupts in 7k/8k crypto nodes
  reset: hi6220: Set module license so that it can be loaded
  MAINTAINERS: add irqchip related drivers to Marvell EBU maintainers
  MAINTAINERS: sort F entries for Marvell EBU maintainers
  ARM: davinci: PM: Do not free useful resources in normal path in 'davinci_pm_init'
  ARM: davinci: PM: Free resources in error handling path in 'davinci_pm_init'
  ARM: dts: bcm283x: Reserve first page for firmware
  memory: atmel-ebi: mark PM ops as __maybe_unused
  MAINTAINERS: Remove Javier Martinez Canillas as reviewer for Exynos

Maniaxx reported a kernel boot crash in the EFI code, which I emulated
by using same invalid phys addr in code:

  BUG: unable to handle kernel paging request at ffffffffff280001
  IP: efi_bgrt_init+0xfb/0x153
  ...
  Call Trace:
   ? bgrt_init+0xbc/0xbc
   acpi_parse_bgrt+0xe/0x12
   acpi_table_parse+0x89/0xb8
   acpi_boot_init+0x445/0x4e2
   ? acpi_parse_x2apic+0x79/0x79
   ? dmi_ignore_irq0_timer_override+0x33/0x33
   setup_arch+0xb63/0xc82
   ? early_idt_handler_array+0x120/0x120
   start_kernel+0xb7/0x443
   ? early_idt_handler_array+0x120/0x120
   x86_64_start_reservations+0x29/0x2b
   x86_64_start_kernel+0x154/0x177
   secondary_startup_64+0x9f/0x9f

There is also a similar bug filed in bugzilla.kernel.org:

  https://bugzilla.kernel.org/show_bug.cgi?id=195633

The crash is caused by this commit:

  7b0a9114 efi/x86: Move the EFI BGRT init code to early init code

The root cause is the firmware on those machines provides invalid BGRT
image addresses.

In a kernel before above commit BGRT initializes late and uses ioremap()
to map the image address. Ioremap validates the address, if it is not a
valid physical address ioremap() just fails and returns. However in current
kernel EFI BGRT initializes early and uses early_memremap() which does not
validate the image address, and kernel panic happens.

According to ACPI spec the BGRT image address should fall into
EFI_BOOT_SERVICES_DATA, see the section 5.2.22.4 of below document:

  http://www.uefi.org/sites/default/files/resources/ACPI_6_1.pdf

Fix this issue by validating the image address in efi_bgrt_init(). If the
image address does not fall into any EFI_BOOT_SERVICES_DATA areas we just
bail out with a warning message.
Reported-by: Maniaxx <tripleshiftone@gmail.com>
Signed-off-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Fixes: 7b0a9114 ("efi/x86: Move the EFI BGRT init code to early init code")
Link: http://lkml.kernel.org/r/20170609084558.26766-2-ard.biesheuvel@linaro.orgSigned-off-by: Ingo Molnar <mingo@kernel.org>

Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into rcu/urgent

Pull RCU fix from Paul E. McKenney:

" This series enables srcu_read_lock() and srcu_read_unlock() to be used from
  interrupt handlers, which fixes a bug in KVM's use of SRCU in delivery
  of interrupts to guest OSes. "
Signed-off-by: Ingo Molnar <mingo@kernel.org>

A bunch of fixes for vmwgfx 4.12 regressions and older stuff. In the latter
case either trivial, cc'd stable or requiring backports for stable.

* 'vmwgfx-fixes-4.12' of git://people.freedesktop.org/~thomash/linux:
  drm/vmwgfx: Bump driver minor and date
  drm/vmwgfx: Remove unused legacy cursor functions
  drm/vmwgfx: fix spelling mistake "exeeds" -> "exceeds"
  drm/vmwgfx: Fix large topology crash
  drm/vmwgfx: Make sure to update STDU when FB is updated
  drm/vmwgfx: Make sure backup_handle is always valid
  drm/vmwgfx: Handle vmalloc() failure in vmw_local_fifo_reserve()
  drm/vmwgfx: Don't create proxy surface for cursor
  drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define_ioctl()

Merge tag 'drm-intel-fixes-2017-06-08' of git://anongit.freedesktop.org/git/drm-intel into drm-fixes

drm/i915 fixes for v4.12-rc5

* tag 'drm-intel-fixes-2017-06-08' of git://anongit.freedesktop.org/git/drm-intel:
  drm/i915: fix warning for unused variable
  drm/i915: Fix 90/270 rotated coordinates for FBC
  drm/i915: Restore has_fbc=1 for ILK-M
  drm/i915: Workaround VLV/CHV DSI scanline counter hardware fail
  drm/i915: Fix logical inversion for gen4 quirking
  drm/i915: Guard against i915_ggtt_disable_guc() being invoked unconditionally
  drm/i915: Always recompute watermarks when distrust_bios_wm is set, v2.
  drm/i915: Prevent the system suspend complete optimization
  drm/i915/psr: disable psr2 for resolution greater than 32X20
  drm/i915: Hold a wakeref for probing the ring registers
  drm/i915: Short-circuit i915_gem_wait_for_idle() if already idle
  drm/i915: Disable decoupled MMIO
  drm/i915/guc: Remove stale comment for q_fail
  drm/i915: Serialize GTT/Aperture accesses on BXT

Driver Changes:
- kirin: Use correct dt port for the bridge (John)
- meson: Fix regression caused by adding HDMI support to allow board
	 configurations without HDMI (Neil)

Cc: John Stultz <john.stultz@linaro.org>
Cc: Neil Armstrong <narmstrong@baylibre.com>

* tag 'drm-misc-fixes-2017-06-07' of git://anongit.freedesktop.org/git/drm-misc:
  drm/meson: Fix driver bind when only CVBS is available
  drm: kirin: Fix drm_of_find_panel_or_bridge conversion