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AF_ALG is deprecated and exposed to unprivileged userspace. Only
use the least buggy algorithm implementations: the pure software ones.
This removes one of the main advantages of AF_ALG, which is the
ability to use it with off-CPU accelerators. However, using off-CPU
accelerators has huge overheads, both in performance and attack surface.
I have yet to see real-world, performance-critical workloads where using
an accelerator via AF_ALG is actually a win over doing cryptography in
userspace.
If using an off-CPU accelerator really does turn out to be a win, a new
API should be developed that is actually a good fit for it.
Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Stop directly calling into function pointers from users of the RAID6 PQ
API, and provide exported functions with proper documentation and API
guarantees asserts where applicable instead.
Link: https://lore.kernel.org/20260518051804.462141-8-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Ard Biesheuvel <ardb@kernel.org> # kunit only on arm64
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Mason <clm@fb.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Li Nan <linan122@huawei.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Song Liu <song@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Allow the same userspace thread to simultaneously collect normal coverage
in syscall context (KCOV_ENABLE) and remote coverage of asynchronous work
created by the thread (KCOV_REMOTE_ENABLE). With this, remote KCOV
coverage becomes useful for generic fuzzing and not just fuzzing of
specific data injection interfaces.
This requires that the task_struct::kcov_* fields are separated into ones
that are used by the task that generates coverage, and ones that are used
by the task that requested remote coverage. To split this up:
- Split task_struct::kcov into kcov and kcov_remote. kcov_task_exit() now
has to clean up both separately.
- Only use task_struct::kcov_mode on the task that generates coverage.
- Only reset task_struct::kcov_handle on the task that requested remote
coverage.
After this change, fields used by the task that generates coverage are:
- kcov_mode
- kcov_size
- kcov_area
- kcov
- kcov_sequence
- kcov_softirq
Fields used by the task that requested remote coverage are:
- kcov_remote
- kcov_handle
[jannh@google.com: remove unused constant KCOV_MODE_REMOTE, per Dmitry]
Link: https://lore.kernel.org/20260515-kcov-simultaneous-remote-v2-1-56fde1cfa509@google.com
[jannh@google.com: update documentation on remote coverage collection]
Link: https://lore.kernel.org/20260519-kcov-docs-v1-1-5bb22f4cb20c@google.com
[jannh@google.com: move and reword sentence on simultaneous normal/remote collection
Link: https://lore.kernel.org/20260520-kcov-docs-v2-1-819f78778763@google.com
Link: https://lore.kernel.org/20260505-kcov-simultaneous-remote-v1-1-a670ba7cefd2@google.com
Signed-off-by: Jann Horn <jannh@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Add option --spdx-cxx-comments to not force C comments (/* */) for SPDX,
but allow also C++ comments (//).
As documented in aa19a176df95d6, this is required for some old toolchains
still have older assembler tools which cannot handle C++ style comments.
This avoids forcing this for projects which vendored checkpatch.pl (e.g.
LTP or u-boot).
Link: https://lore.kernel.org/20260421211408.383972-2-pvorel@suse.cz
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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checkpatch.pl searches for .checkpatch.conf in $CWD, $HOME and
$CWD/.scripts. Allow passing a single directory via CHECKPATCH_CONFIG_DIR
environment variable (empty value is ignored). This allows to directly
use project configuration file for projects which vendored checkpatch.pl
(e.g. LTP or u-boot).
Although it'd be more convenient for user to have --conf-dir option
(instead of using environment variable), code would get ugly because
options from the configuration file needs to be read before processing
command line options with Getopt::Long.
While at it, document directories and environment variable in -h help
and HTML doc.
Link: https://lore.kernel.org/20260421211408.383972-1-pvorel@suse.cz
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON_STAT usage document for newly added kdamond_pid parameter.
Link: https://lore.kernel.org/20260502020505.80822-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON_RECLAIM usage document for the newly added monitoring
intervals auto-tuning enablement parameter.
Link: https://lore.kernel.org/20260501011740.81988-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Now the 'filters/' directory is deprecated. Update ABI document to also
announce the fact. Also update the descriptions of the files to be based
on 'core_filter/' directory, to make the old descriptions ready to be
removed when the time arrives.
Link: https://lore.kernel.org/20260429150309.82282-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Patch series "mm/damon/sysfs: document filters/ directory as deprecated".
Commit ab71d2d30121 ("mm/damon/sysfs-schemes: let
damon_sysfs_scheme_set_filters() be used for different named directories")
introduced alternatives of 'filters' directory, namely core_filters/ and
'ops_filters/ directories. Now the alternatives are well stabilized and
ready for all users. All filters/ directory use cases are expected to be
able to be migrated to the alternatives. An LTS kernel having the
alternatives, namely 6.18.y, is also released. Existence of filters/
directory is only confusing.
It would be better not immediately removing the directory, though. There
could be users that need time before migrating to the alternatives. There
might be unexpected use cases that the alternatives cannot support. Doing
the deprecation step by step across multiple years like DAMON debugfs
deprecation would be safer. Start the deprecation changes by announcing
the deprecation on the documents.
Every year, one more action for completely removing the directory will be
followed, like DAMON debugfs deprecation did. Following yearly actions
are currently expected. In 2027, deprecation warning kernel messages will
be printed once, for use of filters/ directory. In 2028, filters/
directory will be renamed to filters_DEPRECATED/. In 2029,
filters_DEPRECATED/ directory will be removed.
This patch (of 2):
The alternatives of 'filters/' directory, namely 'core_filters/' and
'ops_filters/', can fully support all the features 'filters/' directory
can do, and provide better user experience. Having 'filters/' directory
is only confusing to users. Announce it as deprecated on the usage
document.
Link: https://lore.kernel.org/20260429150309.82282-1-sj@kernel.org
Link: https://lore.kernel.org/20260429150309.82282-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON_LRU_SORT usage document for the changed default monitoring
target region selection.
Link: https://lore.kernel.org/20260429041232.90257-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON_RECLAIM usage document for the changed default monitoring
target region selection.
Link: https://lore.kernel.org/20260429041232.90257-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON ABI document for the DAMON context execution pause/resume
feature.
Link: https://lore.kernel.org/20260427151231.113429-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON usage document for the DAMON context execution pause/resume
feature.
Link: https://lore.kernel.org/20260427151231.113429-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON design document for the context execution pause/resume
feature.
Link: https://lore.kernel.org/20260427151231.113429-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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This patch set introces a new action: DAMOS_COLLAPSE.
For DAMOS_HUGEPAGE and DAMOS_NOHUGEPAGE to work, khugepaged should be
working, since it relies on hugepage_madvise to add a new slot. This slot
should be picked up by khugepaged and eventually collapse (or not, if we
are using DAMOS_NOHUGEPAGE) the pages. If THP is not enabled, khugepaged
will not be working, and therefore no collapse will happen.
DAMOS_COLLAPSE eventually calls madvise_collapse, which will collapse the
address range synchronously. In cases where there is a large VMA
(databases, for example), DAMOS_COLLAPSE allows us to collapse only the
hot region, and not the entire VMA.
This new action may be required to support autotuning with hugepage
as a goal[1].
=========
Benchmarks:
=========
MySQL
=====
Tests were performed in an ARM physical server with MariaDB 10.5 and
sysbench. Read only benchmark was perform with gaussian row hitting,
which follows a normal distribution.
T n, D h: THP set to never, DAMON action set to hugepage
T m, D h: THP set to madvise, DAMON action set to hugepage
T n, D c: THP set to never, DAMON action set to collapse
Memory consumption. Lower is better.
+------------------+----------+----------+----------+
| | T n, D h | T m, D h | T n, D c |
+------------------+----------+----------+----------+
| Total memory use | 2.13 | 2.20 | 2.20 |
| Huge pages | 0 | 1.3 | 1.27 |
+------------------+----------+----------+----------+
Performance in TPS (Transactions Per Second). Higher is better.
T n, D h: 18225.58
T m, D h 18252.93
T n, D c: 18270.21
Performance counter
I got the number of L1 D/I TLB accesses and the number a D/I TLB
accesses that triggered a page walk. I divided the second by the
first to get the percentage of page walkes per TLB access. The
lower the better.
+---------------+--------------+--------------+--------------+
| | T n, D h | T m, D h | T n, D c |
+---------------+--------------+--------------+--------------+
| L1 DTLB | 127248242753 | 125431020479 | 125327001821 |
| L1 ITLB | 80332558619 | 79346759071 | 79298139590 |
| DTLB walk | 75011087 | 52800418 | 55895794 |
| ITLB walk | 71577076 | 71505137 | 67262140 |
| DTLB % misses | 0.058948623 | 0.042095183 | 0.044599961 |
| ITLB % misses | 0.089100954 | 0.090117275 | 0.084821839 |
+---------------+--------------+--------------+--------------+
Masim
=====
I used masim with the "demo" configuration, but changing the times
to 100 seconds for the initial phase and 50 seconds for the rest of
the phases.
Memory consumption:
+------------------+----------+----------+----------+
| | T n, D h | T m, D h | T n, D c |
+------------------+----------+----------+----------+
| Total memory use | 2.38 GB | 2.36 GB | 2.37 GB |
| Huge pages | 0 | 190 MB | 188 MB |
+------------------+----------+----------+----------+
Performance:
THP never, DAMOS_HUGEPAGE
initial phase: 40,491 accesses/msec, 100001 msecs run
low phase 0: 39,658 accesses/msec, 50002 msecs run
high phase 0: 41,678 accesses/msec, 50000 msecs run
low phase 1: 39,625 accesses/msec, 50003 msecs run
high phase 1: 41,658 accesses/msec, 50002 msecs run
low phase 2: 39,642 accesses/msec, 50002 msecs run
high phase 2: 41,640 accesses/msec, 50001 msecs run
THP madvise, DAMOS_HUGEPAGE
initial phase: 51,977 accesses/msec, 100000 msecs run
low phase 0: 86,953 accesses/msec, 50000 msecs run
high phase 0: 94,812 accesses/msec, 50000 msecs run
low phase 1: 101,017 accesses/msec, 50000 msecs run
high phase 1: 94,841 accesses/msec, 50000 msecs run
low phase 2: 100,993 accesses/msec, 50000 msecs run
high phase 2: 94,791 accesses/msec, 50001 msecs run
THP never, DAMOS_COLLAPSE
initial phase: 93,678 accesses/msec, 100001 msecs run
low phase 0: 101,475 accesses/msec, 50000 msecs run
high phase 0: 98,589 accesses/msec, 50000 msecs run
low phase 1: 101,531 accesses/msec, 50001 msecs run
high phase 1: 98,506 accesses/msec, 50001 msecs run
low phase 2: 101,458 accesses/msec, 50001 msecs run
high phase 2: 98,555 accesses/msec, 50000 msecs run
Memory consumption dynamic (how quickly collapses occur):
It shows in seconds how many huge pages are allocated.
+----+----------+----------+
| | T m, D h | T n, D c |
+----+----------+----------+
| 5 | 32 | 188 |
| 10 | 48 | 188 |
| 15 | 64 | 188 |
| 20 | 96 | 188 |
| 30 | 112 | 188 |
| 35 | 144 | 188 |
| 40 | 160 | 188 |
| 45 | 190 | 188 |
| 50 | 190 | 188 |
| 55 | 190 | 188 |
| 60 | 190 | 188 |
+----+----------+----------+
=========
- We can see that DAMOS "hugepage" action works only when THP is set
to madvise. "collapse" action works even when THP is set to never.
- Performance for "collapse" action is slightly lower than "hugepage"
action and THP madvise. This is due to the fact that collapases
occur synchronously. With "hugepage" they may occur during page
faults.
- Memory consumption is slighly lower for "collapse" than "hugepage"
with THP madvise. This is due to the khugepage collapses all VMAs,
while "collapse" action only collapses the VMAs in the hot region.
- There is an improvement in TLB utilization when collapse through
"hugepage" or "collapse" actions are triggered. The amount of
TLB misses is lower.
- "collapse" action is performance synchronously, which means that
page collapses happen earlier and more rapidly. This can be
useful or not, depending on the scenario.
- "hugepage" action may trigger a VMA split in some scenarios, since
it needs to change the flag of the VMA to THP enabled. This may
lead to additional overhead.
Collapse action just adds a new option to chose the correct system
balance.
Link: https://lore.kernel.org/20260426231619.107231-5-sj@kernel.org
Link: https://lore.kernel.org/damon/20260313000816.79933-1-sj@kernel.org/ [1]
Signed-off-by: Asier Gutierrez <gutierrez.asier@huawei-partners.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Cheng-Han Wu <hank20010209@gmail.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Liew Rui Yan <aethernet65535@gmail.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Fix the misspelling of "parametrs" as "parameters" in reclaim.rst and
lru_sort.rst.
Link: https://lore.kernel.org/20260426231619.107231-3-sj@kernel.org
Signed-off-by: Cheng-Han Wu <hank20010209@gmail.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Asier Gutierrez <gutierrez.asier@huawei-partners.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Liew Rui Yan <aethernet65535@gmail.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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DAMON is opted-in for DAMON patches scanning [1] and email delivery [2].
Clarify how that could be used on DAMON maintainer profile.
Link: https://lore.kernel.org/20260412211932.89038-1-sj@kernel.org
Link: https://github.com/sashiko-dev/sashiko/commit/ad9f4a98f958 [1]
Link: https://github.com/sashiko-dev/sashiko/commit/b554c7b6e733 [2]
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON ABI document for the DAMOS action failed regions quota charge
ratio control sysfs files.
Link: https://lore.kernel.org/20260428013402.115171-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON usage document for the DAMOS action failed regions quota
charge ratio control sysfs files.
Link: https://lore.kernel.org/20260428013402.115171-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Update DAMON design document for the DAMOS action failed region quota
charge ratio.
Link: https://lore.kernel.org/20260428013402.115171-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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The xcpu.org links for xcpu-talk, kvmfs, and cellfs-talk are dead
with no archived snapshots available on the Wayback Machine, so
remove them. The PROSE I/O link redirects to a dead server; replace
it with an archived version from web.archive.org.
Signed-off-by: Aayush Patil <aayushpatilsch@gmail.com>
Message-ID: <20260510182856.17569-1-aayushpatilsch@gmail.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
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The PMIC arbiter in the Qualcomm Hawi SoC is version v8.5, which
introduces parity and CRC checks for data received from the PMIC,
as well as NACK checks for command sequences except for read.
All other features in PMIC arbiter remain the same as the one in
the Qualcomm Glymur SoC, with the only differences being some
additional error status checks.
Therefore, add a string for "qcom,hawi-spmi-pmic-arb" as a compatible
entry for "qcom,glymur-spmi-pmic-arb".
Signed-off-by: Fenglin Wu <fenglin.wu@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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The Netlink support for querying page pool stats has been
proven out in production, let's remove the mention of the
helper meant for dumping page pool stats into ethtool -S
from the docs.
Call out in the kdoc that this API is deprecated.
Some drivers may not be able to use the Netlink API
(if page pool is shared across netdevs). So the old API
is not _completely_ dead. But we shouldn't advertise it.
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260526155722.2790742-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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The comment about requirements when to set the NAPI pointer
may not be super clear. Add more words.
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260526155722.2790742-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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The flag was removed in commit 09d96ee5674a ("page_pool: remove
PP_FLAG_PAGE_FRAG"), but the documentation still mentions it when
describing fragment usage. Drop the stale reference; the fragment
API does not require any opt-in flag.
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260526155722.2790742-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux into arm/fixes
Qualcomm driver fixes for v7.1
The Qualcomm ICE driver suffers from race conditions between probe() and
get() and will in certain cases return the wrong error code, which
results in storage drivers failing to probe. Fix these issues.
Also correct the DeviceTree binding, to ensure that relevant clocks are
described and voted for, to prevent the driver from accessing unclocked
hardware during boot.
* tag 'qcom-drivers-fixes-for-7.1' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux:
soc: qcom: ice: Fix the error code when 'qcom,ice' property is not found
scsi: ufs: ufs-qcom: Remove NULL check from devm_of_qcom_ice_get()
mmc: sdhci-msm: Remove NULL check from devm_of_qcom_ice_get()
soc: qcom: ice: Return proper error codes from devm_of_qcom_ice_get() instead of NULL
soc: qcom: ice: Return -ENODEV if the ICE platform device is not found
soc: qcom: ice: Fix race between qcom_ice_probe() and of_qcom_ice_get()
soc: qcom: ice: Allow explicit votes on 'iface' clock for ICE
dt-bindings: crypto: qcom,ice: Fix missing power-domain and iface clk
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Update the segmentation offload documentation to match current GSO types:
- clarify csum_start for encapsulated TSO
- document TCP AccECN GSO and NETIF_F_GSO_ACCECN
- distinguish legacy UFO from UDP L4 GSO
- add ESP and fraglist GSO entries
Link: https://patch.msgid.link/20260526160151.2793354-11-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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checksum-offloads.rst seems like a better place to render
the checksum comment than skbuff.rst.
Remove the stale references to sections in that comment
(it no longer has A, B, C, D, E sections).
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260526160151.2793354-10-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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The Rx checksum processing gives people pause. The two main questions
in my experience are:
- what to do with bad IPv4 checksum; and
- what to do with packets with bad checksum.
Folks often feel the urge to drop the latter, to "avoid overloading
the host".
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260526160151.2793354-9-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Update the checksum offload documentation to match current code:
- SCTP CRC32c offload requires NETIF_F_SCTP_CRC, not ordinary IP
checksum offload
- NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM are restricted legacy
features; new devices should use NETIF_F_HW_CSUM
- GRE LCO is handled by the shared gre_build_header() helper used by
both IPv4 and IPv6 GRE
- VXLAN_F_REMCSUM_TX is a VXLAN configuration flag, not a field of
struct vxlan_rdst
Link: https://patch.msgid.link/20260526160151.2793354-8-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Update netdev feature documentation for current locking rules and
feature semantics. Clarify hw_features updates and netdev_update_features()
locking, keep the NETIF_F_NEVER_CHANGE rule with the VLAN challenged
exception, fix the HSR duplication wording, and document netdev->netmem_tx
as a device flag rather than a feature bit.
Split the list of basic feature sets from the "extra" ones like
vlan_features. A bunch of the newer fields weren't documented and
having them all together would be confusing.
Link: https://patch.msgid.link/20260526160151.2793354-7-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Update the NAPI documentation to match current API behavior:
- repeated napi_disable() calls hang waiting for ownership, rather
than deadlock
- NAPI IDs are exposed through SO_INCOMING_NAPI_ID and netdev Netlink
- epoll uses the maxevents parameter spelling
- add that drivers holding the netdev instance lock may need _locked()
variants
Link: https://patch.msgid.link/20260526160151.2793354-6-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Update the code examples
- update the YNL sample with the latest(?) APIs
- struct dmabuf_tx_cmsg does not exist, use __u32 directly
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260526160151.2793354-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Update the kernel-internal ethtool stats list to match current code:
- spell the entries as "struct ethtool_*_stats", not as functions
- list the full set of structures, not only pause and fec
- mention that fields are pre-initialized to ETHTOOL_STAT_NOT_SET by
ethtool_stats_init() and drivers should leave unsupported fields at
that value rather than zeroing them
Link: https://patch.msgid.link/20260526160151.2793354-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Update the driver documentation TX queue example to match current APIs:
- use the ring-local tx_ring_mask field in drv_tx_avail()
- stop the selected netdev_queue with netif_tx_stop_queue() instead of
stopping queue 0 with netif_stop_queue()
Link: https://patch.msgid.link/20260526160151.2793354-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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A handful of unrelated nits:
- free_netdevice() does not exist; replace two stray references
with free_netdev().
- The simple-driver probe example fell through into err_undo after
register_netdev() success; add return 0 for clarity.
- Clarify the netdev_priv() paragraph: "(netdev_priv())" was easy
to misread as the thing that needs explicit freeing; spell out
that it refers to extra pointers stored in the device private
struct.
- ndo_setup_tc synchronization note: TC_SETUP_BLOCK / TC_SETUP_FT
actually run under block->cb_lock, not "NFT locks", and rtnl_lock
may or may not be held depending on path.
- ->lltx guidance reads as very outdated, it's not really deprecated.
I suspect people may have been trying to use it for HW drivers
in the past but I can't think of such a case in the last decade.
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260526160151.2793354-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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The PMC found on Tegra238 is similar to the version in earlier chips but
some of the register offsets and bitfields differ, so add a specific
compatible string for this new variant.
Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Cross-merge networking fixes after downstream PR (net-7.1-rc6).
Conflicts:
drivers/net/phy/air_en8811h.c
d895767c33781 ("net: phy: air_en8811h: add AN8811HB MCU assert/deassert support")
dddfadd75197e ("net: phy: Add Airoha phy library for shared code")
5226bb6634cdf ("net: phy: air_phy_lib: Factorize BuckPBus register accessors")
e08f0ea6daf2e ("net: phy: Rename Airoha common BuckPBus register accessors")
net/sched/sch_netem.c
a2f6ed7b4873 ("net/sched: netem: add per-impairment extended statistics")
9552b11e3eda ("net/sched: fix packet loop on netem when duplicate is on")
Adjacent changes:
drivers/dpll/zl3073x/core.c
c1224569cef0 ("dpll: zl3073x: make frequency monitor a per-device attribute")
54e65df8cf18 ("dpll: zl3073x: report FFO as DPLL vs input reference offset")
net/iucv/af_iucv.c
347fdd4df85f ("af_iucv: convert to getsockopt_iter")
3589d20a666c ("net/iucv: fix locking in .getsockopt")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Peter sadly passed away a while ago, so change the maintainers for BPMP
SHMEM to Jon and myself.
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Peter sadly passed away a while ago, so I'll be taking over as contact
for this ABI documentation.
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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Add a header asm/neon-intrinsics.h similar to the one that arm64 has.
This makes it possible for NEON intrinsics code to be shared seamlessly
between ARM and arm64.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260422171655.3437334-11-ardb+git@google.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Pull networking fixes from Paolo Abeni:
"This is again significantly bigger than the same point into the
previous cycle, but at least smaller than last week.
I'm not aware of any pending regression for the current cycle.
Including fixes from netfilter.
Current release - regressions:
- netfilter: walk fib6_siblings under RCU
Previous releases - regressions:
- netlink: fix sending unassigned nsid after assigned one
- bridge: fix sleep in atomic context in netlink path
- sched: fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop
- ipv4: fix net->ipv4.sysctl_local_reserved_ports UaF
- eth: tun: free page on short-frame rejection in tun_xdp_one()
Previous releases - always broken:
- skbuff: fix missing zerocopy reference in pskb_carve helpers
- handshake: drain pending requests at net namespace exit
- ethtool:
- rss: avoid modifying the RSS context response
- module: avoid leaking a netdev ref on module flash errors
- coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES
- netfilter: fix dst corruption in same register operation
- nfc: hci: fix out-of-bounds read in HCP header parsing
- ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
- eth:
- vti: use ip6_tnl.net in vti6_changelink().
- vxlan: do not reuse cached ip_hdr() value after
skb_tunnel_check_pmtu()"
* tag 'net-7.1-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (94 commits)
dpll: zl3073x: make frequency monitor a per-device attribute
dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work
dpll: export __dpll_device_change_ntf() for use under dpll_lock
net/handshake: Drain pending requests at net namespace exit
net/handshake: Verify file-reference balance in submit paths
net/handshake: Close the submit-side sock_hold race
net/handshake: hand off the pinned file reference to accept_doit
net/handshake: Take a long-lived file reference at submit
net/handshake: Pass negative errno through handshake_complete()
nvme-tcp: store negative errno in queue->tls_err
net/handshake: Use spin_lock_bh for hn_lock
net: skbuff: fix missing zerocopy reference in pskb_carve helpers
net: hibmcge: move dma_rmb() after dma_sync_single_for_cpu() in RX path
net: hibmcge: disable Relaxed Ordering to fix RX packet corruption
selftests/tc-testing: Add netem test case exercising loops
selftests/tc-testing: Add mirred test cases exercising loops
net/sched: act_mirred: Fix return code in early mirred redirect error paths
net/sched: act_mirred: Fix blockcast recursion bypass leading to stack overflow
net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop
net/sched: fix packet loop on netem when duplicate is on
...
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Add DeviceTree bindings to enumerate the wakeup mailbox used in platform
firmware for Intel processors.
x86 platforms commonly boot secondary CPUs using an INIT assert, de-assert
followed by Start-Up IPI messages. The wakeup mailbox can be used when this
mechanism is unavailable.
The wakeup mailbox offers more control to the operating system to boot
secondary CPUs than a spin-table. It allows the reuse of the same wakeup
vector for all CPUs while maintaining control over which CPUs to boot and
when. While it is possible to achieve the same level of control using a
spin-table, it would require specifying a separate `cpu-release-addr` for
each secondary CPU.
The operation and structure of the mailbox are described in the
Multiprocessor Wakeup Structure defined in the ACPI specification. Note
that this structure does not specify how to publish the mailbox to the
operating system (ACPI-based platform firmware uses a separate table). No
ACPI table is needed in DeviceTree-based firmware to enumerate the mailbox.
Nodes that want to refer to the reserved memory usually define
a `memory-region` property. /cpus/cpu* nodes would want to refer to the
mailbox, but they do not have such property defined in the DeviceTree
specification. Moreover, it would imply that there is a memory region per
CPU. Instead, add a `compatible` property that the operating system can use
to discover the mailbox.
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Rafael J. Wysocki (Intel) <rafael.j.wysocki@intel.com>
Co-developed-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Dexuan Cui <dexuan@kernel.org>
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Backmerge to pull in commit 838d852da850 ("rust: allow
`clippy::collapsible_match` globally"), in order to get rid of spurious
warnings messing with developer tooling.
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
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Add documentation for the Rockchip RK3588 Video Capture (VICAP) unit. To
that end, make the existing rockchip,rk3568-vicap documentation more
general and introduce variant specific constraints.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Michael Riesch <michael.riesch@collabora.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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Add a section that describes the Rockchip RK3588 VICAP.
Reviewed-by: Mehdi Djait <mehdi.djait@linux.intel.com>
Signed-off-by: Michael Riesch <michael.riesch@collabora.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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handshake_complete() declares status as unsigned int and
tls_handshake_done() negates that value (-status) before handing
it to the TLS consumer. Consumers match on negative errno
constants -- xs_tls_handshake_done() has
switch (status) {
case 0:
case -EACCES:
case -ETIMEDOUT:
lower_transport->xprt_err = status;
break;
default:
lower_transport->xprt_err = -EACCES;
}
so the API as designed expects callers to pass positive errno
values that the tlshd shim then negates.
Three internal callers in handshake_nl_accept_doit(), the
net-exit drain, and a kunit test follow kernel convention and
pass negative errnos -- -EIO, -ETIMEDOUT, -ETIMEDOUT. The
implicit conversion to unsigned int turns -ETIMEDOUT into
0xFFFFFF92; the subsequent -status in tls_handshake_done()
wraps back to 110, the consumer's switch falls through, and
the xprt reports -EACCES on what should be -ETIMEDOUT or -EIO.
Fix the API rather than the call sites. The natural kernel
convention is negative errno in, negative errno out. Change
handshake_complete() and hp_done to take int status, drop the
negation in tls_handshake_done(), and negate once in
handshake_nl_done_doit() where status arrives from the wire
as an unsigned netlink attribute. The three internal callers
were already correct under that convention and need no change.
At the same wire boundary, declare MAX_ERRNO as the netlink
policy upper bound for HANDSHAKE_A_DONE_STATUS. Attribute
validation rejects out-of-range values before
handshake_nl_done_doit() runs, and negating a bounded u32 there
stays within int range -- closing the UBSAN-visible signed-
integer overflow that an unconstrained u32 would invoke.
Fixes: 3b3009ea8abb ("net/handshake: Create a NETLINK service for handling handshake requests")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Link: https://patch.msgid.link/20260525-handshake-file-pin-v3-3-66c616906ead@oracle.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Use an enum for all GPU attribute feature ID's and add GPU attributes.
Reviewed-by: Rong Zhang <i@rong.moe>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Derek J. Clark <derekjohn.clark@gmail.com>
Link: https://patch.msgid.link/20260520060740.119554-3-derekjohn.clark@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
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Use an enum for all device ID's and CPU attribute feature ID's,
add missing CPU attributes.
Reviewed-by: Rong Zhang <i@rong.moe>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Derek J. Clark <derekjohn.clark@gmail.com>
Link: https://patch.msgid.link/20260520060740.119554-2-derekjohn.clark@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
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Update the API documentation for KVM_PRE_FAULT_MEMORY to account for
its s390 implementation.
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260527144358.186359-4-imbrenda@linux.ibm.com>
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