Merge tag 'mm-hotfixes-stable-2024-02-27-14-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
"Six hotfixes. Three are cc:stable and the remainder add

Merge tag 'mm-hotfixes-stable-2024-02-27-14-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
"Six hotfixes. Three are cc:stable and the remainder address post-6.7
issues or aren't considered appropriate for backporting"

* tag 'mm-hotfixes-stable-2024-02-27-14-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
mm/debug_vm_pgtable: fix BUG_ON with pud advanced test
mm: cachestat: fix folio read-after-free in cache walk
MAINTAINERS: add memory mapping entry with reviewers
mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index
kasan: revert eviction of stack traces in generic mode
stackdepot: use variable size records for non-evictable entries

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mm: cachestat: fix folio read-after-free in cache walk

In cachestat, we access the folio from the page cache's xarray to compute
its page offset, and check for its dirty and writeback flags. Howeve

mm: cachestat: fix folio read-after-free in cache walk

In cachestat, we access the folio from the page cache's xarray to compute
its page offset, and check for its dirty and writeback flags. However, we
do not hold a reference to the folio before performing these actions,
which means the folio can concurrently be released and reused as another
folio/page/slab.

Get around this altogether by just using xarray's existing machinery for
the folio page offsets and dirty/writeback states.

This changes behavior for tmpfs files to now always report zeroes in their
dirty and writeback counters. This is okay as tmpfs doesn't follow
conventional writeback cache behavior: its pages get "cleaned" during
swapout, after which they're no longer resident etc.

Link: https://lkml.kernel.org/r/20240220153409.GA216065@cmpxchg.org
Fixes: cf264e1329fb ("cachestat: implement cachestat syscall")
Reported-by: Jann Horn <jannh@google.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Nhat Pham <nphamcs@gmail.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Jann Horn <jannh@google.com>
Cc: <stable@vger.kernel.org> [6.4+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Merge branch 'master' into mm-hotfixes-stable

Merge branch 'master' into mm-hotfixes-stable

Merge v6.8-rc1 into drm-misc-fixes

Let's kickstart the 6.8 fix cycle.

Signed-off-by: Maxime Ripard <mripard@kernel.org>

Merge tag 'vfs-6.8.netfs' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs

Pull netfs updates from Christian Brauner:
"This extends the netfs helper library that network filesystems can use

Merge tag 'vfs-6.8.netfs' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs

Pull netfs updates from Christian Brauner:
"This extends the netfs helper library that network filesystems can use
to replace their own implementations. Both afs and 9p are ported. cifs
is ready as well but the patches are way bigger and will be routed
separately once this is merged. That will remove lots of code as well.

The overal goal is to get high-level I/O and knowledge of the page
cache and ouf of the filesystem drivers. This includes knowledge about
the existence of pages and folios

The pull request converts afs and 9p. This removes about 800 lines of
code from afs and 300 from 9p. For 9p it is now possible to do writes
in larger than a page chunks. Additionally, multipage folio support
can be turned on for 9p. Separate patches exist for cifs removing
another 2000+ lines. I've included detailed information in the
individual pulls I took.

Summary:

- Add NFS-style (and Ceph-style) locking around DIO vs buffered I/O
calls to prevent these from happening at the same time.

- Support for direct and unbuffered I/O.

- Support for write-through caching in the page cache.

- O_*SYNC and RWF_*SYNC writes use write-through rather than writing
to the page cache and then flushing afterwards.

- Support for write-streaming.

- Support for write grouping.

- Skip reads for which the server could only return zeros or EOF.

- The fscache module is now part of the netfs library and the
corresponding maintainer entry is updated.

- Some helpers from the fscache subsystem are renamed to mark them as
belonging to the netfs library.

- Follow-up fixes for the netfs library.

- Follow-up fixes for the 9p conversion"

* tag 'vfs-6.8.netfs' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs: (50 commits)
netfs: Fix wrong #ifdef hiding wait
cachefiles: Fix signed/unsigned mixup
netfs: Fix the loop that unmarks folios after writing to the cache
netfs: Fix interaction between write-streaming and cachefiles culling
netfs: Count DIO writes
netfs: Mark netfs_unbuffered_write_iter_locked() static
netfs: Fix proc/fs/fscache symlink to point to "netfs" not "../netfs"
netfs: Rearrange netfs_io_subrequest to put request pointer first
9p: Use length of data written to the server in preference to error
9p: Do a couple of cleanups
9p: Fix initialisation of netfs_inode for 9p
cachefiles: Fix __cachefiles_prepare_write()
9p: Use netfslib read/write_iter
afs: Use the netfs write helpers
netfs: Export the netfs_sreq tracepoint
netfs: Optimise away reads above the point at which there can be no data
netfs: Implement a write-through caching option
netfs: Provide a launder_folio implementation
netfs: Provide a writepages implementation
netfs, cachefiles: Pass upper bound length to allow expansion
...

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Merge tag 'netfs-lib-20231228' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull netfs updates from David Howells:

The main aims of these patches are to get high-level I/

Merge tag 'netfs-lib-20231228' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull netfs updates from David Howells:

The main aims of these patches are to get high-level I/O and knowledge of
the pagecache out of the filesystem drivers as much as possible and to get
rid, as much of possible, of the knowledge that pages/folios exist.
Further, I would like to see ->write_begin, ->write_end and
->launder_folio go away.

Features that are added by these patches to that which is already there in
netfslib:

(1) NFS-style (and Ceph-style) locking around DIO vs buffered I/O calls to
prevent these from happening at the same time. mmap'd I/O can, of
necessity, happen at any time ignoring these locks.

(2) Support for unbuffered I/O. The data is kept in the bounce buffer and
the pagecache is not used. This can be turned on with an inode flag.

(3) Support for direct I/O. This is basically unbuffered I/O with some
extra restrictions and no RMW.

(4) Support for using a bounce buffer in an operation. The bounce buffer
may be bigger than the target data/buffer, allowing for crypto
rounding.

(5) ->write_begin() and ->write_end() are ignored in favour of merging all
of that into one function, netfs_perform_write(), thereby avoiding the
function pointer traversals.

(6) Support for write-through caching in the pagecache.
netfs_perform_write() adds the pages is modifies to an I/O operation
as it goes and directly marks them writeback rather than dirty. When
writing back from write-through, it limits the range written back.
This should allow CIFS to deal with byte-range mandatory locks
correctly.

(7) O_*SYNC and RWF_*SYNC writes use write-through rather than writing to
the pagecache and then flushing afterwards. An AIO O_*SYNC write will
notify of completion when the sub-writes all complete.

(8) Support for write-streaming where modifed data is held in !uptodate
folios, with a private struct attached indicating the range that is
valid.

(9) Support for write grouping, multiplexing a pointer to a group in the
folio private data with the write-streaming data. The writepages
algorithm only writes stuff back that's in the nominated group. This
is intended for use by Ceph to write is snaps in order.

(10) Skipping reads for which we know the server could only supply zeros or
EOF (for instance if we've done a local write that leaves a hole in
the file and extends the local inode size).

General notes:

(1) The fscache module is merged into the netfslib module to avoid cyclic
exported symbol usage that prevents either module from being loaded.

(2) Some helpers from fscache are reassigned to netfslib by name.

(3) netfslib now makes use of folio->private, which means the filesystem
can't use it.

(4) The filesystem provides wrappers to call the write helpers, allowing
it to do pre-validation, oplock/capability fetching and the passing in
of write group info.

(5) I want to try flushing the data when tearing down an inode before
invalidating it to try and render launder_folio unnecessary.

(6) Write-through caching will generate and dispatch write subrequests as
it gathers enough data to hit wsize and has whole pages that at least
span that size. This needs to be a bit more flexible, allowing for a
filesystem such as CIFS to have a variable wsize.

(7) The filesystem driver is just given read and write calls with an
iov_iter describing the data/buffer to use. Ideally, they don't see
pages or folios at all. A function, extract_iter_to_sg(), is already
available to decant part of an iterator into a scatterlist for crypto
purposes.

AFS notes:

(1) I pushed a pair of patches that clean up the trace header down to the
base so that they can be shared with another branch.

9P notes:

(1) Most of xfstests now pass - more, in fact, since upstream 9p lacks a
writepages method and can't handle mmap writes. An occasional oops
(and sometimes panic) happens somewhere in the pathwalk/FID handling
code that is unrelated to these changes.

(2) Writes should now occur in larger-than-page-sized chunks.

(3) It should be possible to turn on multipage folio support in 9P now.

All in all these patches remove a little over 800 lines from AFS, 300
from 9P, albeit with around 3000 lines added to netfs. Hopefully, I will
be able to remove a bunch of lines from Ceph too.

I've split the CIFS patches out to a separate branch, cifs-netfs, where
a further 2000+ lines are removed. I can run a certain amount of
xfstests on CIFS, though I'm running into ksmbd issues and not all the
tests work correctly because of issues between fallocate and what the
SMB protocol actually supports.

I've also dropped the content-crypto patches out for the moment as
they're only usable by the ceph changes which I'm still working on.

The patch to use PG_writeback instead of PG_fscache for writing to the
cache has also been deferred, pending 9p, afs, ceph and cifs all being
converted.

* tag 'netfs-lib-20231228' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: (40 commits)
9p: Use netfslib read/write_iter
afs: Use the netfs write helpers
netfs: Export the netfs_sreq tracepoint
netfs: Optimise away reads above the point at which there can be no data
netfs: Implement a write-through caching option
netfs: Provide a launder_folio implementation
netfs: Provide a writepages implementation
netfs, cachefiles: Pass upper bound length to allow expansion
netfs: Provide netfs_file_read_iter()
netfs: Allow buffered shared-writeable mmap through netfs_page_mkwrite()
netfs: Implement buffered write API
netfs: Implement unbuffered/DIO write support
netfs: Implement unbuffered/DIO read support
netfs: Allocate multipage folios in the writepath
netfs: Make netfs_read_folio() handle streaming-write pages
netfs: Provide func to copy data to pagecache for buffered write
netfs: Dispatch write requests to process a writeback slice
netfs: Prep to use folio->private for write grouping and streaming write
netfs: Make the refcounting of netfs_begin_read() easier to use
netfs: Make netfs_put_request() handle a NULL pointer
...

Signed-off-by: Christian Brauner <brauner@kernel.org>

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netfs: Implement unbuffered/DIO write support

Implement support for unbuffered writes and direct I/O writes. If the
write is misaligned with respect to the fscrypt block size, then RMW cycles
are p

netfs: Implement unbuffered/DIO write support

Implement support for unbuffered writes and direct I/O writes. If the
write is misaligned with respect to the fscrypt block size, then RMW cycles
are performed if necessary. DIO writes are a special case of unbuffered
writes with extra restriction imposed, such as block size alignment
requirements.

Also provide a field that can tell the code to add some extra space onto
the bounce buffer for use by the filesystem in the case of a
content-encrypted file.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org

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netfs: Implement unbuffered/DIO read support

Implement support for unbuffered and DIO reads in the netfs library,
utilising the existing read helper code to do block splitting and
individual queuing

netfs: Implement unbuffered/DIO read support

Implement support for unbuffered and DIO reads in the netfs library,
utilising the existing read helper code to do block splitting and
individual queuing. The code also handles extraction of the destination
buffer from the supplied iterator, allowing async unbuffered reads to take
place.

The read will be split up according to the rsize setting and, if supplied,
the ->clamp_length() method. Note that the next subrequest will be issued
as soon as issue_op returns, without waiting for previous ones to finish.
The network filesystem needs to pause or handle queuing them if it doesn't
want to fire them all at the server simultaneously.

Once all the subrequests have finished, the state will be assessed and the
amount of data to be indicated as having being obtained will be
determined. As the subrequests may finish in any order, if an intermediate
subrequest is short, any further subrequests may be copied into the buffer
and then abandoned.

In the future, this will also take care of doing an unbuffered read from
encrypted content, with the decryption being done by the library.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org

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Merge remote-tracking branch 'torvalds/master' into perf-tools-next

To pick up fixes that went thru perf-tools for v6.7 and to get in sync
with upstream to check for drift in the copies of headers,

Merge remote-tracking branch 'torvalds/master' into perf-tools-next

To pick up fixes that went thru perf-tools for v6.7 and to get in sync
with upstream to check for drift in the copies of headers, etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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Merge branch 'for-6.8/cxl-cdat' into for-6.8/cxl

Pick up the CDAT parsing and QOS class infrastructure for v6.8.

Merge 6.7-rc5 into tty-next

We need the serial fixes in here as well to build off of.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge 6.7-rc5 into usb-next

We need the USB fixes in here as well to build off of.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge tag 'loongarch-kvm-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

LoongArch KVM changes for v6.8

1. Optimization for memslot hugepage checking.
2. C

Merge tag 'loongarch-kvm-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

LoongArch KVM changes for v6.8

1. Optimization for memslot hugepage checking.
2. Cleanup and fix some HW/SW timer issues.
3. Add LSX/LASX (128bit/256bit SIMD) support.

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Merge 6.7-rc5 into char-misc-next

We need the char/misc fixes in here as well for testing and to build off
of.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge branch 'for-6.8/amd-sfh' into for-linus

- addition of new interfaces to export User presence information and
Ambient light from amd-sfh to other drivers within the kernel (Basavaraj
Natika

Merge branch 'for-6.8/amd-sfh' into for-linus

- addition of new interfaces to export User presence information and
Ambient light from amd-sfh to other drivers within the kernel (Basavaraj
Natikar)

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Merge tag 'v6.7-rc7' into gpio/for-next

Linux 6.7-rc7

Merge tag 'device_is_big_endian-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core into gpio/for-next

Tag for the device_is_big_endian() addition to property.h

For others

Merge tag 'device_is_big_endian-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core into gpio/for-next

Tag for the device_is_big_endian() addition to property.h

For others to be able to pull from in a stable way.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Expose c0 and SW encap ICM for RDMA

These two series from Mark and Shun extend RDMA mlx5 API.

Mark's series provides c0 register used to match egress
traffic sent by local device.

Shun's series ad

Expose c0 and SW encap ICM for RDMA

These two series from Mark and Shun extend RDMA mlx5 API.

Mark's series provides c0 register used to match egress
traffic sent by local device.

Shun's series adds new type for ICM area.

Link: https://lore.kernel.org/all/cover.1701871118.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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Backmerge tag 'v6.7-rc5' into drm-next

Linux 6.7-rc5

Alex requested this for some amdkfd work relying on the symbols exports.

Signed-off-by: Dave Airlie <airlied@redhat.com>

Merge remote-tracking branch 'drm-misc/drm-misc-next' into msm-next

Backmerge drm-misc-next to pick up some dependencies for drm/msm
patches, in particular:

https://patchwork.freedesktop.org/patch/

Merge remote-tracking branch 'drm-misc/drm-misc-next' into msm-next

Backmerge drm-misc-next to pick up some dependencies for drm/msm
patches, in particular:

https://patchwork.freedesktop.org/patch/570219/?series=127251&rev=1
https://patchwork.freedesktop.org/series/123411/

Signed-off-by: Rob Clark <robdclark@chromium.org>

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Merge drm/drm-next into drm-misc-next

Backmerging to get commit 8d6ef26501b9 ("drm/ast: Disconnect BMC if
physical connector is connected") into drm-misc-next.

Signed-off-by: Thomas Zimmermann <tzi

Merge drm/drm-next into drm-misc-next

Backmerging to get commit 8d6ef26501b9 ("drm/ast: Disconnect BMC if
physical connector is connected") into drm-misc-next.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

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ASoC: Intel: Soundwire related board and match updates

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

A small update for SDW machine support:
Small fixes for sof_sdw machine dri

ASoC: Intel: Soundwire related board and match updates

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

A small update for SDW machine support:
Small fixes for sof_sdw machine driver
Support for rt722
New TGL/MTL and LNL match for new configurations

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Merge tag 'v6.7-rc2' into media_stage

Linux 6.7-rc2

* tag 'v6.7-rc2': (325 commits)
Linux 6.7-rc2
prctl: Disable prctl(PR_SET_MDWE) on parisc
parisc/power: Fix power soft-off when running on

Merge tag 'v6.7-rc2' into media_stage

Linux 6.7-rc2

* tag 'v6.7-rc2': (325 commits)
Linux 6.7-rc2
prctl: Disable prctl(PR_SET_MDWE) on parisc
parisc/power: Fix power soft-off when running on qemu
parisc: Replace strlcpy() with strscpy()
NFSD: Fix checksum mismatches in the duplicate reply cache
NFSD: Fix "start of NFS reply" pointer passed to nfsd_cache_update()
NFSD: Update nfsd_cache_append() to use xdr_stream
nfsd: fix file memleak on client_opens_release
dm-crypt: start allocating with MAX_ORDER
dm-verity: don't use blocking calls from tasklets
dm-bufio: fix no-sleep mode
dm-delay: avoid duplicate logic
dm-delay: fix bugs introduced by kthread mode
dm-delay: fix a race between delay_presuspend and delay_bio
drm/amdgpu/gmc9: disable AGP aperture
drm/amdgpu/gmc10: disable AGP aperture
drm/amdgpu/gmc11: disable AGP aperture
drm/amdgpu: add a module parameter to control the AGP aperture
drm/amdgpu/gmc11: fix logic typo in AGP check
drm/amd/display: Fix encoder disable logic
...

Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

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Merge drm/drm-next into drm-misc-next

Let's kickstart the v6.8 release cycle.

Signed-off-by: Maxime Ripard <mripard@kernel.org>