Add MicroLZMA support in order to maximize compression ratios for
specific scenarios. For example, it's useful for low-end embedded
boards and as a secondary algorithm in a file for specific access
patterns.

MicroLZMA is a new container format for raw LZMA1, which was created
by Lasse Collin aiming to minimize old LZMA headers and get rid of
unnecessary EOPM (end of payload marker) as well as to enable
fixed-sized output compression, especially for 4KiB pclusters.

Similar to LZ4, inplace I/O approach is used to minimize runtime
memory footprint when dealing with I/O. Overlapped decompression is
handled with 1) bounced buffer for data under processing or 2) extra
short-lived pages from the on-stack pagepool which will be shared in
the same read request (128KiB for example).

Link: https://lore.kernel.org/r/20211010213145.17462-8-xiang@kernel.orgAcked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Previously, some LZ4 methods were named with `generic'. However, while
evaluating the effective LZMA approach, it seems they aren't quite
generic at all (e.g. no need preparing dstpages for most LZMA cases.)

Avoid such naming instead.

Link: https://lore.kernel.org/r/20211010213145.17462-7-xiang@kernel.orgAcked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

uncompressible -> incompressible
non-splitted -> non-split

Link: https://lore.kernel.org/r/20211010213145.17462-6-xiang@kernel.orgSigned-off-by: Lasse Collin <lasse.collin@tukaani.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

MicroLZMA is a yet another header format variant where the first
byte of a raw LZMA stream (without the end of stream marker) has
been replaced with a bitwise-negation of the lc/lp/pb properties
byte. MicroLZMA was created to be used in EROFS but can be used
by other things too where wasting minimal amount of space for
headers is important.

This is implemented using most of the LZMA2 code as is so the
amount of new code is small. The API has a few extra features
compared to the XZ decoder. On the other hand, the API lacks
XZ_BUF_ERROR support which is important to take into account
when using this API.

MicroLZMA doesn't support BCJ filters. In theory they could be
added later as there are many unused/reserved values for the
first byte of the compressed stream but in practice it is
somewhat unlikely to happen due to a few implementation reasons.

Link: https://lore.kernel.org/r/20211010213145.17462-5-xiang@kernel.orgSigned-off-by: Lasse Collin <lasse.collin@tukaani.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

It's a more logical place even if the resetting needs to be done
only once per LZMA2 stream (if lzma_reset() called in the middle
of an LZMA2 stream, .len will already be 0).

Link: https://lore.kernel.org/r/20211010213145.17462-4-xiang@kernel.orgSigned-off-by: Lasse Collin <lasse.collin@tukaani.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

This might matter, for example, if the underlying type of enum xz_check
was a signed char. In such a case the validation wouldn't have caught an
unsupported header. I don't know if this problem can occur in the kernel
on any arch but it's still good to fix it because some people might copy
the XZ code to their own projects from Linux instead of the upstream
XZ Embedded repository.

This change may increase the code size by a few bytes. An alternative
would have been to use an unsigned int instead of enum xz_check but
using an enumeration looks cleaner.

Link: https://lore.kernel.org/r/20211010213145.17462-3-xiang@kernel.orgSigned-off-by: Lasse Collin <lasse.collin@tukaani.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

With valid files, the safety margin described in lib/decompress_unxz.c
ensures that these buffers cannot overlap. But if the uncompressed size
of the input is larger than the caller thought, which is possible when
the input file is invalid/corrupt, the buffers can overlap. Obviously
the result will then be garbage (and usually the decoder will return
an error too) but no other harm will happen when such an over-run occurs.

This change only affects uncompressed LZMA2 chunks and so this
should have no effect on performance.

Link: https://lore.kernel.org/r/20211010213145.17462-2-xiang@kernel.orgSigned-off-by: Lasse Collin <lasse.collin@tukaani.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Previously, the readahead window was strictly followed by EROFS
decompression strategy in order to minimize extra memory footprint.
However, it could become inefficient if just reading the partial
requested data for much big LZ4 pclusters and the upcoming LZMA
implementation.

Let's try to request the leading data in a pcluster without
triggering memory reclaiming instead for the LZ4 approach first
to boost up 100% randread of large big pclusters, and it has no real
impact on low memory scenarios.

It also introduces a way to expand read lengths in order to decompress
the whole pcluster, which is useful for LZMA since the algorithm
itself is relatively slow and causes CPU bound, but LZ4 is not.

Link: https://lore.kernel.org/r/20211008200839.24541-4-xiang@kernel.orgReviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Previously, for each HEAD lcluster, it can be either HEAD or PLAIN
lcluster to indicate whether the whole pcluster is compressed or not.

In this patch, a new HEAD2 head type is introduced to specify another
compression algorithm other than the primary algorithm for each
compressed file, which can be used for upcoming LZMA compression and
LZ4 range dictionary compression for various data patterns.

It has been stayed in the EROFS roadmap for years. Complete it now!

Link: https://lore.kernel.org/r/20211017165721.2442-1-xiang@kernel.orgReviewed-by: Yue Hu <huyue2@yulong.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Currently, z_erofs_map_blocks_iter() returns whether extents are
compressed or not, and the decompression frontend gets the specific
algorithms then.

It works but not quite well in many aspests, for example:
 - The decompression frontend has to deal with whether extents are
   compressed or not again and lookup the algorithms if compressed.
   It's duplicated and too detailed about the on-disk mapping.

 - A new secondary compression head will be introduced later so that
   each file can have 2 compression algorithms at most for different
   type of data. It could increase the complexity of the decompression
   frontend if still handled in this way;

 - A new readmore decompression strategy will be introduced to get
   better performance for much bigger pcluster and lzma, which needs
   the specific algorithm in advance as well.

Let's look up compression algorithms in z_erofs_map_blocks_iter()
directly instead.

Link: https://lore.kernel.org/r/20211008200839.24541-2-xiang@kernel.orgReviewed-by: Chao Yu <chao@kernel.org>
Reviewed-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

In order to support multi-layer container images, add multiple
device feature to EROFS. Two ways are available to use for now:

 - Devices can be mapped into 32-bit global block address space;
 - Device ID can be specified with the chunk indexes format.

Note that it assumes no extent would cross device boundary and mkfs
should take care of it seriously.

In the future, a dedicated device manager could be introduced then
thus extra devices can be automatically scanned by UUID as well.

Link: https://lore.kernel.org/r/20211014081010.43485-1-hsiangkao@linux.alibaba.comReviewed-by: Chao Yu <chao@kernel.org>
Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Previously, EROFS mount options are all in the basic types, so
erofs_fs_context can be directly copied with assignment. However,
when the multiple device feature is introduced, it's hard to handle
multiple device information like the other basic mount options.

Let's separate basic mount option usage from fs_context, thus
multiple device information can be handled gracefully then.

No logic changes.

Link: https://lore.kernel.org/r/20211007070224.12833-1-hsiangkao@linux.alibaba.comReviewed-by: Chao Yu <chao@kernel.org>
Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

As Xiang mentioned, such path has no real impact to our current
decompression strategy, remove it directly. Also, update the return
value of z_erofs_lz4_decompress() to 0 if success to keep consistent
with LZMA which will return 0 as well for that case.

Link: https://lore.kernel.org/r/20211014065744.1787-1-zbestahu@gmail.comReviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

In commit b212921b ("elf: don't use MAP_FIXED_NOREPLACE for elf
executable mappings") we still leave MAP_FIXED_NOREPLACE in place for
load_elf_interp.

Unfortunately, this will cause kernel to fail to start with:

    1 (init): Uhuuh, elf segment at 00003ffff7ffd000 requested but the memory is mapped already
    Failed to execute /init (error -17)

The reason is that the elf interpreter (ld.so) has overlapping segments.

  readelf -l ld-2.31.so
  Program Headers:
    Type           Offset             VirtAddr           PhysAddr
                   FileSiz            MemSiz              Flags  Align
    LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                   0x000000000002c94c 0x000000000002c94c  R E    0x10000
    LOAD           0x000000000002dae0 0x000000000003dae0 0x000000000003dae0
                   0x00000000000021e8 0x0000000000002320  RW     0x10000
    LOAD           0x000000000002fe00 0x000000000003fe00 0x000000000003fe00
                   0x00000000000011ac 0x0000000000001328  RW     0x10000

The reason for this problem is the same as described in commit
ad55eac7 ("elf: enforce MAP_FIXED on overlaying elf segments").

Not only executable binaries, elf interpreters (e.g. ld.so) can have
overlapping elf segments, so we better drop MAP_FIXED_NOREPLACE and go
back to MAP_FIXED in load_elf_interp.

Fixes: 4ed28639 ("fs, elf: drop MAP_FIXED usage from elf_map")
Cc: <stable@vger.kernel.org> # v4.19
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Chen Jingwen <chenjingwen6@huawei.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull ext4 fixes from Ted Ts'o:
 "Fix a number of ext4 bugs in fast_commit, inline data, and delayed
  allocation.

  Also fix error handling code paths in ext4_dx_readdir() and
  ext4_fill_super().

  Finally, avoid a grabbing a journal head in the delayed allocation
  write in the common cases where we are overwriting a pre-existing
  block or appending to an inode"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: recheck buffer uptodate bit under buffer lock
  ext4: fix potential infinite loop in ext4_dx_readdir()
  ext4: flush s_error_work before journal destroy in ext4_fill_super
  ext4: fix loff_t overflow in ext4_max_bitmap_size()
  ext4: fix reserved space counter leakage
  ext4: limit the number of blocks in one ADD_RANGE TLV
  ext4: enforce buffer head state assertion in ext4_da_map_blocks
  ext4: remove extent cache entries when truncating inline data
  ext4: drop unnecessary journal handle in delalloc write
  ext4: factor out write end code of inline file
  ext4: correct the error path of ext4_write_inline_data_end()
  ext4: check and update i_disksize properly
  ext4: add error checking to ext4_ext_replay_set_iblocks()

The objtool warning that the kvm instruction emulation code triggered
wasn't very useful:

    arch/x86/kvm/emulate.o: warning: objtool: __ex_table+0x4: don't know how to handle reloc symbol type: kvm_fastop_exception

in that it helpfully tells you which symbol name it had trouble figuring
out the relocation for, but it doesn't actually say what the unknown
symbol type was that triggered it all.

In this case it was because of missing type information (type 0, aka
STT_NOTYPE), but on the whole it really should just have printed that
out as part of the message.

Because if this warning triggers, that's very much the first thing you
want to know - why did reloc2sec_off() return failure for that symbol?

So rather than just saying you can't handle some type of symbol without
saying what the type _was_, just print out the type number too.

Fixes: 24ff6525 ("objtool: Teach get_alt_entry() about more relocation types")
Link: https://lore.kernel.org/lkml/CAHk-=wiZwq-0LknKhXN4M+T8jbxn_2i9mcKpO+OaBSSq_Eh7tg@mail.gmail.com/Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The recent change to make objtool aware of more symbol relocation types
(commit 24ff6525: "objtool: Teach get_alt_entry() about more
relocation types") also added another check, and resulted in this
objtool warning when building kvm on x86:

    arch/x86/kvm/emulate.o: warning: objtool: __ex_table+0x4: don't know how to handle reloc symbol type: kvm_fastop_exception

The reason seems to be that kvm_fastop_exception() is marked as a global
symbol, which causes the relocation to ke kept around for objtool.  And
at the same time, the kvm_fastop_exception definition (which is done as
an inline asm statement) doesn't actually set the type of the global,
which then makes objtool unhappy.

The minimal fix is to just not mark kvm_fastop_exception as being a
global symbol.  It's only used in that one compilation unit anyway, so
it was always pointless.  That's how all the other local exception table
labels are done.

I'm not entirely happy about the kinds of games that the kvm code plays
with doing its own exception handling, and the fact that it confused
objtool is most definitely a symptom of the code being a bit too subtle
and ad-hoc.  But at least this trivial one-liner makes objtool no longer
upset about what is going on.

Fixes: 24ff6525 ("objtool: Teach get_alt_entry() about more relocation types")
Link: https://lore.kernel.org/lkml/CAHk-=wiZwq-0LknKhXN4M+T8jbxn_2i9mcKpO+OaBSSq_Eh7tg@mail.gmail.com/
Cc: Borislav Petkov <bp@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull char/misc driver fixes from Greg KH:
 "Here are some small misc driver fixes for 5.15-rc4. They are in two
  "groups":

   - ipack driver fixes for issues found by Johan Hovold

   - interconnect driver fixes for reported problems

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  ipack: ipoctal: fix module reference leak
  ipack: ipoctal: fix missing allocation-failure check
  ipack: ipoctal: fix tty-registration error handling
  ipack: ipoctal: fix tty registration race
  ipack: ipoctal: fix stack information leak
  interconnect: qcom: sdm660: Add missing a2noc qos clocks
  dt-bindings: interconnect: sdm660: Add missing a2noc qos clocks
  interconnect: qcom: sdm660: Correct NOC_QOS_PRIORITY shift and mask
  interconnect: qcom: sdm660: Fix id of slv_cnoc_mnoc_cfg

Merge tag 'driver-core-5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are some driver core and kernfs fixes for reported issues for
  5.15-rc4. These fixes include:

   - kernfs positive dentry bugfix

   - debugfs_create_file_size error path fix

   - cpumask sysfs file bugfix to preserve the user/kernel abi (has been
     reported multiple times.)

   - devlink fixes for mdiobus devices as reported by the subsystem
     maintainers.

  Also included in here are some devlink debugging changes to make it
  easier for people to report problems when asked. They have already
  helped with the mdiobus and other subsystems reporting issues.

  All of these have been linux-next for a while with no reported issues"

* tag 'driver-core-5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  kernfs: also call kernfs_set_rev() for positive dentry
  driver core: Add debug logs when fwnode links are added/deleted
  driver core: Create __fwnode_link_del() helper function
  driver core: Set deferred probe reason when deferred by driver core
  net: mdiobus: Set FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD for mdiobus parents
  driver core: fw_devlink: Add support for FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD
  driver core: fw_devlink: Improve handling of cyclic dependencies
  cpumask: Omit terminating null byte in cpumap_print_{list,bitmask}_to_buf
  debugfs: debugfs_create_file_size(): use IS_ERR to check for error

Pull scheduler fixes from Borislav Petkov:

 - Tell the compiler to always inline is_percpu_thread()

 - Make sure tunable_scaling buffer is null-terminated after an update
   in sysfs

 - Fix LTP named regression due to cgroup list ordering

* tag 'sched_urgent_for_v5.15_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Always inline is_percpu_thread()
  sched/fair: Null terminate buffer when updating tunable_scaling
  sched/fair: Add ancestors of unthrottled undecayed cfs_rq

Pull perf fixes from Borislav Petkov:

 - Make sure the destroy callback is reset when a event initialization
   fails

 - Update the event constraints for Icelake

 - Make sure the active time of an event is updated even for inactive
   events

* tag 'perf_urgent_for_v5.15_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: fix userpage->time_enabled of inactive events
  perf/x86/intel: Update event constraints for ICX
  perf/x86: Reset destroy callback on event init failure

Pull objtool fix from Borislav Petkov:

 - Handle symbol relocations properly due to changes in the toolchains
   which remove section symbols now

* tag 'objtool_urgent_for_v5.15_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Teach get_alt_entry() about more relocation types

Merge tag 'hwmon-for-v5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - Fixed various potential NULL pointer accesses in w8379* drivers

 - Improved error handling, fault reporting, and fixed rounding in
   thmp421 driver

 - Fixed error handling in ltc2947 driver

 - Added missing attribute to pmbus/mp2975 driver

 - Fixed attribute values in pbus/ibm-cffps, occ, and mlxreg-fan
   drivers

 - Removed unused residual code from k10temp driver

* tag 'hwmon-for-v5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field
  hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field
  hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field
  hwmon: (pmbus/mp2975) Add missed POUT attribute for page 1 mp2975 controller
  hwmon: (pmbus/ibm-cffps) max_power_out swap changes
  hwmon: (occ) Fix P10 VRM temp sensors
  hwmon: (ltc2947) Properly handle errors when looking for the external clock
  hwmon: (tmp421) fix rounding for negative values
  hwmon: (tmp421) report /PVLD condition as fault
  hwmon: (tmp421) handle I2C errors
  hwmon: (mlxreg-fan) Return non-zero value when fan current state is enforced from sysfs
  hwmon: (k10temp) Remove residues of current and voltage

Pull ksmbd server fixes from Steve French:
 "Eleven fixes for the ksmbd kernel server, mostly security related:

   - an important fix for disabling weak NTLMv1 authentication

   - seven security (improved buffer overflow checks) fixes

   - fix for wrong infolevel struct used in some getattr/setattr paths

   - two small documentation fixes"

* tag '5.15-rc3-ksmbd-fixes' of git://git.samba.org/ksmbd:
  ksmbd: missing check for NULL in convert_to_nt_pathname()
  ksmbd: fix transform header validation
  ksmbd: add buffer validation for SMB2_CREATE_CONTEXT
  ksmbd: add validation in smb2 negotiate
  ksmbd: add request buffer validation in smb2_set_info
  ksmbd: use correct basic info level in set_file_basic_info()
  ksmbd: remove NTLMv1 authentication
  ksmbd: fix documentation for 2 functions
  MAINTAINERS: rename cifs_common to smbfs_common in cifs and ksmbd entry
  ksmbd: fix invalid request buffer access in compound
  ksmbd: remove RFC1002 check in smb2 request

Pull SCSI fixes from James Bottomley:
 "Five fairly minor fixes and spelling updates, all in drivers. Even
  though the ufs fix is in tracing, it's a potentially exploitable use
  beyond end of array bug"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: csiostor: Add module softdep on cxgb4
  scsi: qla2xxx: Fix excessive messages during device logout
  scsi: virtio_scsi: Fix spelling mistake "Unsupport" -> "Unsupported"
  scsi: ses: Fix unsigned comparison with less than zero
  scsi: ufs: Fix illegal offset in UPIU event trace

Pull block fixes from Jens Axboe:
 "A few block fixes for this release:

   - Revert a BFQ commit that causes breakage for people. Unfortunately
     it was auto-selected for stable as well, so now 5.14.7 suffers from
     it too. Hopefully stable will pick up this revert quickly too, so
     we can remove the issue on that end as well.

   - Add a quirk for Apple NVMe controllers, which due to their
     non-compliance broke due to the introduction of command sequences
     (Keith)

   - Use shifts in nbd, fixing a __divdi3 issue (Nick)"

* tag 'block-5.15-2021-10-01' of git://git.kernel.dk/linux-block:
  nbd: use shifts rather than multiplies
  Revert "block, bfq: honor already-setup queue merges"
  nvme: add command id quirk for apple controllers

Pull io_uring fixes from Jens Axboe:
 "Two fixes in here:

   - The signal issue that was discussed start of this week (me).

   - Kill dead fasync support in io_uring. Looks like it was broken
     since io_uring was initially merged, and given that nobody has ever
     complained about it, let's just kill it (Pavel)"

* tag 'io_uring-5.15-2021-10-01' of git://git.kernel.dk/linux-block:
  io_uring: kill fasync
  io-wq: exclusively gate signal based exit on get_signal() return

Pull libnvdimm fixes from Dan Williams:
 "A fix for a regression added this cycle in the pmem driver, and for a
  long standing bug for failed NUMA node lookups on ARM64.

  This has appeared in -next for several days with no reported issues.

  Summary:

   - Fix a regression that caused the sysfs ABI for pmem block devices
     to not be registered. This fails the nvdimm unit tests and dax
     xfstests.

   - Fix numa node lookups for dax-kmem memory (device-dax memory
     assigned to the page allocator) on ARM64"

* tag 'libnvdimm-fixes-5.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nvdimm/pmem: fix creating the dax group
  ACPI: NFIT: Use fallback node id when numa info in NFIT table is incorrect

In cachefiles_mark_object_buried, the dentry in question may not have an
owner, and thus our cachefiles_object pointer may be NULL when calling
the tracepoint, in which case we will also not have a valid debug_id to
print in the tracepoint.

Check for NULL object in the tracepoint and if so, just set debug_id to
MAX_UINT as was done in 2908f5e1 ("fscache: Add a cookie debug ID
and use that in traces").

This fixes the following oops:

    FS-Cache: Cache "mycache" added (type cachefiles)
    CacheFiles: File cache on vdc registered
    ...
    Workqueue: fscache_object fscache_object_work_func [fscache]
    RIP: 0010:trace_event_raw_event_cachefiles_mark_buried+0x4e/0xa0 [cachefiles]
    ....
    Call Trace:
     cachefiles_mark_object_buried+0xa5/0xb0 [cachefiles]
     cachefiles_bury_object+0x270/0x430 [cachefiles]
     cachefiles_walk_to_object+0x195/0x9c0 [cachefiles]
     cachefiles_lookup_object+0x5a/0xc0 [cachefiles]
     fscache_look_up_object+0xd7/0x160 [fscache]
     fscache_object_work_func+0xb2/0x340 [fscache]
     process_one_work+0x1f1/0x390
     worker_thread+0x53/0x3e0
     kthread+0x127/0x150

Fixes: 2908f5e1 ("fscache: Add a cookie debug ID and use that in traces")
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5.15-rc1 crashes with blank screen when booting up on two ThinkPads
using i915.  Bisections converge convincingly, but arrive at different
and suprising "culprits", none of them the actual culprit.

netconsole (with init_netconsole() hacked to call i915_init() when
logging has started, instead of by module_init()) tells the story:

kernel BUG at drivers/gpu/drm/i915/i915_sw_fence.c:245!
with RSI: ffffffff814d408b pointing to sw_fence_dummy_notify().
I've been building with CONFIG_CC_OPTIMIZE_FOR_SIZE=y, and that
function needs to be 4-byte aligned.

Fixes: 62eaf0ae ("drm/i915/guc: Support request cancellation")
Signed-off-by: Hugh Dickins <hughd@google.com>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

If driver read tmp value sufficient for
(tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 4) & 0x7))
from device then Null pointer dereference occurs.
(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)
Also lm75[] does not serve a purpose anymore after switching to
devm_i2c_new_dummy_device() in w83791d_detect_subclients().

The patch fixes possible NULL pointer dereference by removing lm75[].

Found by Linux Driver Verification project (linuxtesting.org).

Cc: stable@vger.kernel.org
Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Link: https://lore.kernel.org/r/20210921155153.28098-3-lutovinova@ispras.ru
[groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

If driver read val value sufficient for
(val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7))
from device then Null pointer dereference occurs.
(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)
Also lm75[] does not serve a purpose anymore after switching to
devm_i2c_new_dummy_device() in w83791d_detect_subclients().

The patch fixes possible NULL pointer dereference by removing lm75[].

Found by Linux Driver Verification project (linuxtesting.org).

Cc: stable@vger.kernel.org
Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Link: https://lore.kernel.org/r/20210921155153.28098-2-lutovinova@ispras.ru
[groeck: Dropped unnecessary continuation lines, fixed multipline alignment]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

If driver read val value sufficient for
(val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7))
from device then Null pointer dereference occurs.
(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)
Also lm75[] does not serve a purpose anymore after switching to
devm_i2c_new_dummy_device() in w83791d_detect_subclients().

The patch fixes possible NULL pointer dereference by removing lm75[].

Found by Linux Driver Verification project (linuxtesting.org).

Cc: stable@vger.kernel.org
Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Link: https://lore.kernel.org/r/20210921155153.28098-1-lutovinova@ispras.ru
[groeck: Dropped unnecessary continuation lines, fixed multi-line alignment]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Add missed attribute for reading POUT from page 1.
It is supported by device, but has been missed in initial commit.

Fixes: 2c6fcbb2 ("hwmon: (pmbus) Add support for MPS Multi-phase mp2975 controller")
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20210927070740.2149290-1-vadimp@nvidia.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

The bytes for max_power_out from the ibm-cffps devices differ in byte
order for some power supplies.

The Witherspoon power supply returns the bytes in MSB/LSB order.

The Rainier power supply returns the bytes in LSB/MSB order.

The Witherspoon power supply uses version cffps1. The Rainier power
supply should use version cffps2. If version is cffps1, swap the bytes
before output to max_power_out.

Tested:
    Witherspoon before: 3148. Witherspoon after: 3148.
    Rainier before: 53255. Rainier after: 2000.
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20210928205051.1222815-1-bjwyman@gmail.com
[groeck: Replaced yoda programming]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

The P10 (temp sensor version 0x10) doesn't do the same VRM status
reporting that was used on P9. It just reports the temperature, so
drop the check for VRM fru type in the sysfs show function, and don't
set the name to "alarm".

Fixes: db4919ec ("hwmon: (occ) Add new temperature sensor type")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20210929153604.14968-1-eajames@linux.ibm.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Pull s390 fix from Vasily Gorbik:
 "One fix for 5.15-rc4: Avoid CIO excessive path-verification requests,
  which might cause unwanted delays"

* tag 's390-5.15-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/cio: avoid excessive path-verification requests

Because Rui is now going to focus on work that is not related to the
maintenance of the thermal subsystem in the kernel, Rafael will start
to help Daniel with handling the development process as a new member
of the thermal maintainers team.  Rui will continue to review patches
in that area.

The thermal development process flow will change so that the material
from the thermal git tree will be merged into the thermal branch of
the linux-pm.git tree before going into the mainline.

Update the information in MAINTAINERS accordingly.
Signed-off-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull more kvm fixes from Paolo Bonzini:
 "Small x86 fixes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: selftests: Ensure all migrations are performed when test is affined
  KVM: x86: Swap order of CPUID entry "index" vs. "significant flag" checks
  ptp: Fix ptp_kvm_getcrosststamp issue for x86 ptp_kvm
  x86/kvmclock: Move this_cpu_pvti into kvmclock.h
  selftests: KVM: Don't clobber XMM register when read
  KVM: VMX: Fix a TSX_CTRL_CPUID_CLEAR field mask issue