For LTO we need to run the link step with gcc, not ld.
Since there are a lot of linker options passed to it, add a gcc-ld wrapper
that wraps them as -Wl,
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391846481-31491-10-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
LTO turns all global symbols effectively into statics. This
has the side effect that they all have a .NUMBER postfix to make
them unique. In modpost drop this postfix because it confuses
it.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391846481-31491-8-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This reference is discarded, but can cause warnings when it refers to
exit. Ignore for now.
This is a workaround and can be removed once we get rid of
-fno-toplevel-reorder
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391846481-31491-7-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Here is the workaround I made for having the kernel not reject modules
built with -flto. The clean solution would be to get the compiler to not
emit the symbol. Or if it has to emit the symbol, then emit it as
initialized data but put it into a comdat/linkonce section.
Minor tweaks by AK over Joe's patch.
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391846481-31491-5-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Work around a LTO gcc problem: when there is no reference to a variable
in a module it will be moved to the end of the program. This causes
reordering of initcalls which the kernel does not like.
Add a dummy reference function to avoid this. The function is
deleted by the linker.
This replaces a previous much slower workaround.
Thanks to Jan "Honza" Hubička for suggesting this technique.
Suggested-by: Jan Hubička <hubicka@ucw.cz>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391846481-31491-4-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
The VDSO does not play well with LTO, so just disable LTO for it.
Also pass a 32bit linker flag for the 32bit version.
[ hpa: change braces to parens to match kernel Makefile style ]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391846481-31491-1-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
In LTO symbols implicitely referenced by the compiler need
to be visible. Earlier these symbols were visible implicitely
from being exported, but we disabled implicit visibility fo
EXPORTs when modules are disabled to improve code size. So
now these symbols have to be marked visible explicitely.
Do this for __stack_chk_fail (with stack protector)
and memcmp.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-10-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
main_extable_sort_needed is used by the build system and needs
to be a normal ELF symbol. Make it visible so that LTO
does not remove or mangle it.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-8-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Various kernel/mutex.c functions can be called from
inline assembler, so they should be all global and
__visible.
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-7-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
lockdep_sys_exit can be called from assembler code, so make it
asmlinkage.
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-5-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Mark variables referenced from assembler files visible.
This fixes compile problems with LTO.
Cc: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-4-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
kvm_rebooting is referenced from assembler code, thus
needs to be visible.
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-1-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Pull SELinux fixes from James Morris.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
SELinux: Fix kernel BUG on empty security contexts.
selinux: add SOCK_DIAG_BY_FAMILY to the list of netlink message types
Pull vfs fixes from Al Viro:
"A couple of fixes, both -stable fodder. The O_SYNC bug is fairly
old..."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
fix a kmap leak in virtio_console
fix O_SYNC|O_APPEND syncing the wrong range on write()
While we are at it, don't do kmap() under kmap_atomic(), *especially*
for a page we'd allocated with GFP_KERNEL. It's spelled "page_address",
and had that been more than that, we'd have a real trouble - kmap_high()
can block, and doing that while holding kmap_atomic() is a Bad Idea(tm).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
It actually goes back to 2004 ([PATCH] Concurrent O_SYNC write support)
when sync_page_range() had been introduced; generic_file_write{,v}() correctly
synced
pos_after_write - written .. pos_after_write - 1
but generic_file_aio_write() synced
pos_before_write .. pos_before_write + written - 1
instead. Which is not the same thing with O_APPEND, obviously.
A couple of years later correct variant had been killed off when
everything switched to use of generic_file_aio_write().
All users of generic_file_aio_write() are affected, and the same bug
has been copied into other instances of ->aio_write().
The fix is trivial; the only subtle point is that generic_write_sync()
ought to be inlined to avoid calculations useless for the majority of
calls.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Pull btrfs fixes from Chris Mason:
"This is a small collection of fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
Btrfs: fix data corruption when reading/updating compressed extents
Btrfs: don't loop forever if we can't run because of the tree mod log
btrfs: reserve no transaction units in btrfs_ioctl_set_features
btrfs: commit transaction after setting label and features
Btrfs: fix assert screwup for the pending move stuff
Pull perf fixes from Ingo Molnar:
"Tooling fixes, mostly related to the KASLR fallout, but also other
fixes"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf buildid-cache: Check relocation when checking for existing kcore
perf tools: Adjust kallsyms for relocated kernel
perf tests: No need to set up ref_reloc_sym
perf symbols: Prevent the use of kcore if the kernel has moved
perf record: Get ref_reloc_sym from kernel map
perf machine: Set up ref_reloc_sym in machine__create_kernel_maps()
perf machine: Add machine__get_kallsyms_filename()
perf tools: Add kallsyms__get_function_start()
perf symbols: Fix symbol annotation for relocated kernel
perf tools: Fix include for non x86 architectures
perf tools: Fix AAAAARGH64 memory barriers
perf tools: Demangle kernel and kernel module symbols too
perf/doc: Remove mention of non-existent set_perf_event_pending() from design.txt
When using a mix of compressed file extents and prealloc extents, it
is possible to fill a page of a file with random, garbage data from
some unrelated previous use of the page, instead of a sequence of zeroes.
A simple sequence of steps to get into such case, taken from the test
case I made for xfstests, is:
_scratch_mkfs
_scratch_mount "-o compress-force=lzo"
$XFS_IO_PROG -f -c "pwrite -S 0x06 -b 18670 266978 18670" $SCRATCH_MNT/foobar
$XFS_IO_PROG -c "falloc 26450 665194" $SCRATCH_MNT/foobar
$XFS_IO_PROG -c "truncate 542872" $SCRATCH_MNT/foobar
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar
This results in the following file items in the fs tree:
item 4 key (257 INODE_ITEM 0) itemoff 15879 itemsize 160
inode generation 6 transid 6 size 542872 block group 0 mode 100600
item 5 key (257 INODE_REF 256) itemoff 15863 itemsize 16
inode ref index 2 namelen 6 name: foobar
item 6 key (257 EXTENT_DATA 0) itemoff 15810 itemsize 53
extent data disk byte 0 nr 0 gen 6
extent data offset 0 nr 24576 ram 266240
extent compression 0
item 7 key (257 EXTENT_DATA 24576) itemoff 15757 itemsize 53
prealloc data disk byte 12849152 nr 241664 gen 6
prealloc data offset 0 nr 241664
item 8 key (257 EXTENT_DATA 266240) itemoff 15704 itemsize 53
extent data disk byte 12845056 nr 4096 gen 6
extent data offset 0 nr 20480 ram 20480
extent compression 2
item 9 key (257 EXTENT_DATA 286720) itemoff 15651 itemsize 53
prealloc data disk byte 13090816 nr 405504 gen 6
prealloc data offset 0 nr 258048
The on disk extent at offset 266240 (which corresponds to 1 single disk block),
contains 5 compressed chunks of file data. Each of the first 4 compress 4096
bytes of file data, while the last one only compresses 3024 bytes of file data.
Therefore a read into the file region [285648 ; 286720[ (length = 4096 - 3024 =
1072 bytes) should always return zeroes (our next extent is a prealloc one).
The solution here is the compression code path to zero the remaining (untouched)
bytes of the last page it uncompressed data into, as the information about how
much space the file data consumes in the last page is not known in the upper layer
fs/btrfs/extent_io.c:__do_readpage(). In __do_readpage we were correctly zeroing
the remainder of the page but only if it corresponds to the last page of the inode
and if the inode's size is not a multiple of the page size.
This would cause not only returning random data on reads, but also permanently
storing random data when updating parts of the region that should be zeroed.
For the example above, it means updating a single byte in the region [285648 ; 286720[
would store that byte correctly but also store random data on disk.
A test case for xfstests follows soon.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
A user reported a 100% cpu hang with my new delayed ref code. Turns out I
forgot to increase the count check when we can't run a delayed ref because of
the tree mod log. If we can't run any delayed refs during this there is no
point in continuing to look, and we need to break out. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Added in patch "btrfs: add ioctls to query/change feature bits online"
modifications to superblock don't need to reserve metadata blocks when
starting a transaction.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
The set_fslabel ioctl uses btrfs_end_transaction, which means it's
possible that the change will be lost if the system crashes, same for
the newly set features. Let's use btrfs_commit_transaction instead.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Wang noticed that he was failing btrfs/030 even though me and Filipe couldn't
reproduce. Turns out this is because Wang didn't have CONFIG_BTRFS_ASSERT set,
which meant that a key part of Filipe's original patch was not being built in.
This appears to be a mess up with merging Filipe's patch as it does not exist in
his original patch. Fix this by changing how we make sure del_waiting_dir_move
asserts that it did not error and take the function out of the ifdef check.
This makes btrfs/030 pass with the assert on or off. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Filipe Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
- Protect pinctrl_list_add() with the proper mutex. This
was identified by RedHat. Caused nasty locking warnings
was rootcased by Stanislaw Gruszka.
- Avoid adding dangerous debugfs files when either half of
the subsystem is unused: pinmux or pinconf.
- Various fixes to various drivers: locking, hardware
particulars, DT parsing, error codes.
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Merge tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pinctrl fixes from Linus Walleij:
"First round of pin control fixes for v3.14:
- Protect pinctrl_list_add() with the proper mutex. This was
identified by RedHat. Caused nasty locking warnings was rootcased
by Stanislaw Gruszka.
- Avoid adding dangerous debugfs files when either half of the
subsystem is unused: pinmux or pinconf.
- Various fixes to various drivers: locking, hardware particulars, DT
parsing, error codes"
* tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: tegra: return correct error type
pinctrl: do not init debugfs entries for unimplemented functionalities
pinctrl: protect pinctrl_list add
pinctrl: sirf: correct the pin index of ac97_pins group
pinctrl: imx27: fix offset calculation in imx_read_2bit
pinctrl: vt8500: Change devicetree data parsing
pinctrl: imx27: fix wrong offset to ICONFB
pinctrl: at91: use locked variant of irq_set_handler
Pull x86 fixes from Peter Anvin:
"Quite a varied little collection of fixes. Most of them are
relatively small or isolated; the biggest one is Mel Gorman's fixes
for TLB range flushing.
A couple of AMD-related fixes (including not crashing when given an
invalid microcode image) and fix a crash when compiled with gcov"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, microcode, AMD: Unify valid container checks
x86, hweight: Fix BUG when booting with CONFIG_GCOV_PROFILE_ALL=y
x86/efi: Allow mapping BGRT on x86-32
x86: Fix the initialization of physnode_map
x86, cpu hotplug: Fix stack frame warning in check_irq_vectors_for_cpu_disable()
x86/intel/mid: Fix X86_INTEL_MID dependencies
arch/x86/mm/srat: Skip NUMA_NO_NODE while parsing SLIT
mm, x86: Revisit tlb_flushall_shift tuning for page flushes except on IvyBridge
x86: mm: change tlb_flushall_shift for IvyBridge
x86/mm: Eliminate redundant page table walk during TLB range flushing
x86/mm: Clean up inconsistencies when flushing TLB ranges
mm, x86: Account for TLB flushes only when debugging
x86/AMD/NB: Fix amd_set_subcaches() parameter type
x86/quirks: Add workaround for AMD F16h Erratum792
x86, doc, kconfig: Fix dud URL for Microcode data
I missed a couple errors in reviewing the patches converting jfs
to use the generic posix ACL function. Setting ACL's currently
fails with -EOPNOTSUPP.
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Reported-by: Michael L. Semon <mlsemon35@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
On archs like S390 or um this driver cannot build nor work.
Make it depend on HAS_IOMEM to bypass build failures.
drivers/built-in.o: In function `dw_wdt_drv_probe':
drivers/watchdog/dw_wdt.c:302: undefined reference to `devm_ioremap_resource'
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Here is a single kernfs fix to resolve a much-reported lockdep issue with the
removal of entries in sysfs.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core fix from Greg KH:
"Here is a single kernfs fix to resolve a much-reported lockdep issue
with the removal of entries in sysfs"
* tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
kernfs: make kernfs_deactivate() honor KERNFS_LOCKDEP flag
Pull ceph fixes from Sage Weil:
"There is an RBD fix for a crash due to the immutable bio changes, an
error path fix, and a locking fix in the recent redirect support"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
libceph: do not dereference a NULL bio pointer
libceph: take map_sem for read in handle_reply()
libceph: factor out logic from ceph_osdc_start_request()
libceph: fix error handling in ceph_osdc_init()
does not conflict with the dynamic linker's one (64K)
- VDSO gettimeofday fix
- Barrier fixes for atomic operations and cache flushing
- TLB invalidation when overriding early page mappings during boot
- Wired up new 32-bit arm (compat) syscalls
- LSM_MMAP_MIN_ADDR when COMPAT is enabled
- defconfig update
- Clean-up (comments, pgd_alloc).
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
- Relax VDSO alignment requirements so that the kernel-picked one (4K)
does not conflict with the dynamic linker's one (64K)
- VDSO gettimeofday fix
- Barrier fixes for atomic operations and cache flushing
- TLB invalidation when overriding early page mappings during boot
- Wired up new 32-bit arm (compat) syscalls
- LSM_MMAP_MIN_ADDR when COMPAT is enabled
- defconfig update
- Clean-up (comments, pgd_alloc).
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: defconfig: Expand default enabled features
arm64: asm: remove redundant "cc" clobbers
arm64: atomics: fix use of acquire + release for full barrier semantics
arm64: barriers: allow dsb macro to take option parameter
security: select correct default LSM_MMAP_MIN_ADDR on arm on arm64
arm64: compat: Wire up new AArch32 syscalls
arm64: vdso: update wtm fields for CLOCK_MONOTONIC_COARSE
arm64: vdso: fix coarse clock handling
arm64: simplify pgd_alloc
arm64: fix typo: s/SERRROR/SERROR/
arm64: Invalidate the TLB when replacing pmd entries during boot
arm64: Align CMA sizes to PAGE_SIZE
arm64: add DSB after icache flush in __flush_icache_all()
arm64: vdso: prevent ld from aligning PT_LOAD segments to 64k
Pull MIPS updates from Ralf Baechle:
"hree minor patches. All have sat in -next for a few days"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: fpu.h: Fix build when CONFIG_BUG is not set
MIPS: Wire up sched_setattr/sched_getattr syscalls
MIPS: Alchemy: Fix DB1100 GPIO registration
Pull media fixes from Mauro Carvalho Chehab:
"A series of small fixes. Mostly driver ones. There is one core
regression fix on a patch that was meant to fix some race issues on
vb2, but that actually caused more harm than good. So, we're just
reverting it for now"
* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
[media] adv7842: Composite free-run platfrom-data fix
[media] v4l2-dv-timings: fix GTF calculation
[media] hdpvr: Fix memory leak in debug
[media] af9035: add ID [2040:f900] Hauppauge WinTV-MiniStick 2
[media] mxl111sf: Fix compile when CONFIG_DVB_USB_MXL111SF is unset
[media] mxl111sf: Fix unintentional garbage stack read
[media] cx24117: use a valid dev pointer for dev_err printout
[media] cx24117: remove dead code in always 'false' if statement
[media] update Michael Krufky's email address
[media] vb2: Check if there are buffers before streamon
[media] Revert "[media] videobuf_vm_{open,close} race fixes"
[media] go7007-loader: fix usb_dev leak
[media] media: bt8xx: add missing put_device call
[media] exynos4-is: Compile in fimc-lite runtime PM callbacks conditionally
[media] exynos4-is: Compile in fimc runtime PM callbacks conditionally
[media] exynos4-is: Fix error paths in probe() for !pm_runtime_enabled()
[media] s5p-jpeg: Fix wrong NV12 format parameters
[media] s5k5baf: allow to handle arbitrary long i2c sequences
Fix da9055 interrupt initialization
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Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
Pull hwmon fixes from Guenter Roeck:
"Fix PMBus driver problem with some multi-page voltage sensors and fix
da9055 interrupt initialization"
* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: (da9055) Remove use of regmap_irq_get_virq()
hwmon: (pmbus) Support per-page exponent in linear mode
- Fix for a recent ACPI hotplug regression causing a NULL pointer
dereference to occur while handling ACPI eject notifications for
already ejected devices. From Toshi Kani.
- Four concurrency-related fixes for ACPIPHP. Two of them add
missing locking and the other two fix race conditions related to
reference counting.
- ACPIPHP fix to avoid NULL pointer dereferences during device removal
involving Virtual Funcions.
- intel_pstate fix to make it compute the percentage of time the CPU
is busy properly. From Dirk Brandewie.
- Removal of two unnecessary NULL pointer checks in ACPI code and a
fix for sscanf() format string from Dan Carpenter and Luis G.F.
- New ACPI video blacklist entry for HP EliteBook Revolve 810 from
Mika Westerberg.
/
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Merge tag 'pm+acpi-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management fixes from Rafael Wysocki:
"These include a fix for a recent ACPI hotplug regression, four
concurrency related fixes and one PCI device removal fix for
ACPI-based PCI hotplug (ACPIPHP), intel_pstate fix that should go into
stable, three simple ACPI cleanups and a new entry for the ACPI video
blacklist.
Specifics:
- Fix for a recent ACPI hotplug regression causing a NULL pointer
dereference to occur while handling ACPI eject notifications for
already ejected devices. From Toshi Kani.
- Four concurrency-related fixes for ACPIPHP. Two of them add
missing locking and the other two fix race conditions related to
reference counting.
- ACPIPHP fix to avoid NULL pointer dereferences during device
removal involving Virtual Funcions.
- intel_pstate fix to make it compute the percentage of time the CPU
is busy properly. From Dirk Brandewie.
- Removal of two unnecessary NULL pointer checks in ACPI code and a
fix for sscanf() format string from Dan Carpenter and Luis G.F.
- New ACPI video blacklist entry for HP EliteBook Revolve 810 from
Mika Westerberg"
* tag 'pm+acpi-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / hotplug: Fix panic on eject to ejected device
ACPI / battery: Fix incorrect sscanf() string in acpi_battery_init_alarm()
ACPI / proc: remove unneeded NULL check
ACPI / utils: remove a pointless NULL check
ACPI / video: Add HP EliteBook Revolve 810 to the blacklist
intel_pstate: Take core C0 time into account for core busy calculation
ACPI / hotplug / PCI: Fix bridge removal race vs dock events
ACPI / hotplug / PCI: Fix bridge removal race in handle_hotplug_event()
ACPI / hotplug / PCI: Scan root bus under the PCI rescan-remove lock
ACPI / hotplug / PCI: Move PCI rescan-remove locking to hotplug_event()
ACPI / hotplug / PCI: Remove entries from bus->devices in reverse order
Commit f38a5181d9 ("ceph: Convert to immutable biovecs") introduced
a NULL pointer dereference, which broke rbd in -rc1. Fix it.
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
