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Separate out the end-of-comment logic into its own helper and remove the
duplicated code introduced earlier.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250621203512.223189-8-corbet@lwn.net
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Move the recognition of this state to when we enter it, rather than when we
exit, eliminating some twisty logic along the way.
Some changes in output do result from this shift, generally for kerneldoc
comments that do not quite fit the format. See, for example,
struct irqdomain. As far as I can tell, the new behavior is more correct
in each case.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250621203512.223189-7-corbet@lwn.net
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Merge the duplicated code back into a single implementation. Code movement
only, no logic changes.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250621203512.223189-6-corbet@lwn.net
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The state known as BODY_WITH_BLANK_LINE really, in a convoluted way,
indicates a "special section" that is terminated by a blank line or the
beginning of a new section. That is either "@param: desc" sections, or the
weird "context" section that plays by the same rules.
Rename the state to SPECIAL_SECTION and split its processing into a
separate function; no real changes to the logic yet.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250621203512.223189-5-corbet@lwn.net
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The BODY_MAYBE state really describes the "we are in a declaration" state.
Rename it accordingly, and split the handling of this state out from that
of the other BODY* states. This change introduces a fair amount of
duplicated code that will be coalesced in a later patch.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250621203512.223189-4-corbet@lwn.net
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Pull the repeated "begin a section" logic into a single place and hide it
within the KernelEntry class.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250621203512.223189-3-corbet@lwn.net
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The regex in the BODY_WITH_BLANK_LINE case was looking for lines starting
with " * ", where exactly one space was allowed before the following text.
There are many kerneldoc comments where the authors have put multiple
spaces instead, leading to mis-formatting of the documentation.
Specifically, in this case, the description portion is associated with the
last of the parameters.
Allow multiple spaces in this context.
See, for example, synchronize_hardirq() and how its documentation is
formatted before and after the change.
Acked-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Tested-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250621203512.223189-2-corbet@lwn.net
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Long before introduction of lore.kernel.org, people would link
to LKML threads on third-party archives (here spinics.net), which
in some cases can be unreliable (as these were outside of
kernel.org control). Replace links to them with lore counterparts
(if any).
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250611065254.36608-2-bagasdotme@gmail.com
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In commit b5325b2a270f ("coredump: hand a pidfd to the usermode coredump
helper") a new core_pattern specifier, %F, was added to provide a pidfs
to the usermode helper process referring to the crashed process.
Update the documentation to include the new core_pattern specifier.
Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250612060204.1159734-1-carnil@debian.org
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It appears that folks "less versed in kernel coding" think that its
good style to document every function, even if they have no useful
information to pass to the future readers of the code. This used
to be just a waste of space, but with increased kdoc format linting
it's also a burden when refactoring the code.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Joe Damato <joe@dama.to>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250614204258.61449-1-kuba@kernel.org
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This patch fixes two minor typos in Documentation/filesystems/f2fs.rst:
- "ramdom" → "random"
- "reenable" → "re-enable"
The changes improve spelling and consistency in the documentation.
These issues were identified using the 'codespell' tool with the
following command:
$ find Documentation/ -path Documentation/translations -prune -o \
-name '*.rst' -print | xargs codespell
Signed-off-by: Yuanye Ma <yuanye.ma20@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250618225546.104949-1-yuanye.ma20@gmail.com
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In the AMD P-States Performance Scale diagram, the labels for "Max Perf"
and "Lowest Perf" were incorrectly used to define the range for
"Desired Perf".The "Desired performance target" should be bounded by the
"Maximum requested performance" and the "Minimum requested performance",
which corresponds to "Max Perf" and "Min Perf", respectively.
Signed-off-by: Shouye Liu <shouyeliu@tencent.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250620021658.92161-1-shouyeliu@gmail.com
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Docutils emits a deprecation warning when the set_class() element method is
used; that warning disappears into the ether, but it also causes a crash
with docutils 0.19.
Avoid the deprecated function and just append directly to the "classes"
attribute like the documentation says instead.
Reported-by: Akira Yokosawa <akiyks@gmail.com>
Tested-by: Akira Yokosawa <akiyks@gmail.com>
Closes: https://lore.kernel.org/de7bae91-3200-481f-9db2-c0dc382c91dd@gmail.com/
Fixes: d6d1df92c25f ("docs: automarkup: Mark up undocumented entities too")
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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pull_task(), the original function to move the task from src_rq to the
dst_rq during load balancing was renamed to move_tasks() in commit
ddcdf6e7d991 ("sched: Rename load-balancing fields")
As a part of commit 163122b7fcfa ("sched/fair: Remove
double_lock_balance() from load_balance()"), move_task() was broken down
into detach_tasks() and attach_tasks() pair to avoid holding locks of
both src_rq and dst_rq at the same time during load balancing.
Despite the evolution of pull_task() over the years, the sched-stats
documentation remained unchanged. Update the documentation to refer to
detach_task() instead of pull_task() which is responsible for removing
the task from the src_rq during load balancing.
commit 1c055a0f5d3b ("sched: Move sched domain name out of
CONFIG_SCHED_DEBUG") moves sched domain name out of CONFIG_SCHED_DEBUG.
Update the documentation related to that.
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Suggested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Swapnil Sapkal <swapnil.sapkal@amd.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250430062559.1188661-1-swapnil.sapkal@amd.com
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Fix a typo and improve wording and punctuation in
the documentation for Userspace API.
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Hanne-Lotta Mäenpää <hannelotta@gmail.com>
Link: https://lore.kernel.org/r/20250522115255.137450-4-hannelotta@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Fix typos and improve grammar in the documentation for
fwctl subsystem.
Use the word user space consistently, instead of having
two variants (user space vs. userspace).
Change wording of denied behaviour to be disallowed
behaviour when describing the interface.
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Hanne-Lotta Mäenpää <hannelotta@gmail.com>
Link: https://lore.kernel.org/r/20250522115255.137450-3-hannelotta@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Setting the cpu affinity mask of a SCHED_DEADLINE process using the cgroup v1
cpuset controller is already detailed. Add similar information for cgroup v2's
cpuset controller.
Signed-off-by: Shashank Balaji <shashank.mahadasyam@sony.com>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250527-sched-deadline-cpu-affinity-v2-2-b8b40a4feefa@sony.com
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rt-app no longer accepts command-line arguments. So, replace rt-app example
with chrt and use the JSON format in the other example instead of command-
line arguments.
Signed-off-by: Shashank Balaji <shashank.mahadasyam@sony.com>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250527-sched-deadline-cpu-affinity-v2-1-b8b40a4feefa@sony.com
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Fix the following documentation build error, which was introduced when
Documentation/arch/powerpc/htm.rst was added to the repository without
any reference to the document.
Documentation/arch/powerpc/htm.rst: WARNING: document isn't included in any toctree [toc.not_included]
Fixes: ab1456c5aa7a ("powerpc/pseries/htmdump: Add documentation for H_HTM debugfs interface")
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
Tested-by: Athira Rajeev <atrajeev@linux.ibm.com>
Fixes: ab1456c5aa7a63d5 ("powerpc/pseries/htmdump: Add documentation for H_HTM debugfs interface")
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250528054146.2658537-2-me@brighamcampbell.com
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The reiserfsprogs package is no longer needed since ReiserFS was removed
in Linux 6.13. Furthermore, the package is no longer maintained.
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/2d6b194b33e8aacd12999b6ddfe21b5753c1171c.1749352106.git.collin.funk1@gmail.com
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The reiserfsprogs package is no longer needed since ReiserFS was removed
in Linux 6.13.
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/4d9808b5e3a87eab41d5d0417d453800faad98b1.1749352106.git.collin.funk1@gmail.com
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The Sphinx Alabaster theme uses border-bottom to mark reference links; the
result does not render correctly (the underline is missing) in some browser
configurations. Switch to using the standard text-underline property, and
use text-underline-offset to place that underline below any underscores in
the underlined text.
Suggested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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The automarkup code generates markup and a cross-reference link for
functions, structs, etc. for which it finds kerneldoc documentation.
Undocumented entities are left untouched; that creates an inconsistent
reading experience and has caused some writers to go to extra measures to
cause the markup to happen.
Mark up detected C entities regardless of whether they are documented.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Remove a few declarations that are no longer doing anything now that we
have left Sphinx 2 behind.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Add some comments to process_name() to cover its broad phases of operation,
and slightly restructure the if/then/else structure to remove some early
returns.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-10-corbet@lwn.net
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Move two complex regexes up with the other patterns, decluttering this
function and allowing the compilation to be done once rather than for every
kerneldoc comment.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-9-corbet@lwn.net
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The code testing for a pointer declaration in process_name() has no actual
effect on subsequent actions; remove it.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-8-corbet@lwn.net
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The entry.descr value used in process_name() is not actually a member of
the KernelEntry class; it is a bit of local state. So just manage it
locally.
A trim_whitespace() helper was added to clean up the code slightly.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-7-corbet@lwn.net
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entry::is_kernel_comment never had anything to do with the entry itself; it
is a bit of local state in one branch of process_name(). It can, in fact,
be removed entirely; rework the code slightly so that it is no longer
needed.
No change in the rendered output.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-6-corbet@lwn.net
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process_name() looks for the first line of a kerneldoc comment. It
contains two nearly identical regular expressions, the second of which only
catches six cases in the kernel, all of the form:
define SOME_MACRO_NAME - description
Simply put the "define" into the regex and discard it, eliminating the loop
and the code to remove it specially.
Note that this still treats these defines as if they were functions, but
that's a separate issue.
There is no change in the generated output.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-5-corbet@lwn.net
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It is only used in one place, so just put the constant string
"Introduction" there so people don't have to go looking for it.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-4-corbet@lwn.net
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Since all of the handlers already nicely have the same prototype, put them
into a table and call them from there and take out the extended
if-then-else series.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-3-corbet@lwn.net
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Remove the unneeded "cont" variable and tighten up the code slightly.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606163438.229916-2-corbet@lwn.net
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Replace misspelled "eariler" with "earlier" and drop the stray period
after "example".
Signed-off-by: Runji Liu <runjiliu.tech@gmail.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250526134046.1042-1-runjiliu.tech@gmail.com
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We have all this fine kernel-doc written, and it's not published
anywhere. Expose it to public view.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250604195753.823742-1-willy@infradead.org
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The support for dropping "_noprof" missed dropping the suffix from
exported symbols. That meant that using the :export: feature would
look for kernel-doc for (eg) krealloc_noprof() and not find the
kernel-doc for krealloc().
Fixes: 51a7bf0238c2 (scripts/kernel-doc: drop "_noprof" on function prototypes)
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250606141543.1285671-1-willy@infradead.org
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Fix misspelling of "typedef".
Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/e532b992a79999d3405a363db4b2bd4504fed592.1749434907.git.collin.funk1@gmail.com
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git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
Pull turbostat updates from Len Brown:
- Add initial DMR support, which required smarter RAPL probe
- Fix AMD MSR RAPL energy reporting
- Add RAPL power limit configuration output
- Minor fixes
* tag 'turbostat-2025.06.08' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
tools/power turbostat: version 2025.06.08
tools/power turbostat: Add initial support for BartlettLake
tools/power turbostat: Add initial support for DMR
tools/power turbostat: Dump RAPL sysfs info
tools/power turbostat: Avoid probing the same perf counters
tools/power turbostat: Allow probing RAPL with platform_features->rapl_msrs cleared
tools/power turbostat: Clean up add perf/msr counter logic
tools/power turbostat: Introduce add_msr_counter()
tools/power turbostat: Remove add_msr_perf_counter_()
tools/power turbostat: Remove add_cstate_perf_counter_()
tools/power turbostat: Remove add_rapl_perf_counter_()
tools/power turbostat: Quit early for unsupported RAPL counters
tools/power turbostat: Always check rapl_joules flag
tools/power turbostat: Fix AMD package-energy reporting
tools/power turbostat: Fix RAPL_GFX_ALL typo
tools/power turbostat: Add Android support for MSR device handling
tools/power turbostat.8: pm_domain wording fix
tools/power turbostat.8: fix typo: idle_pct should be pct_idle
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer cleanup from Thomas Gleixner:
"The delayed from_timer() API cleanup:
The renaming to the timer_*() namespace was delayed due massive
conflicts against Linux-next. Now that everything is upstream finish
the conversion"
* tag 'timers-cleanups-2025-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
treewide, timers: Rename from_timer() to timer_container_of()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner:
"A small set of x86 fixes:
- Cure IO bitmap inconsistencies
A failed fork cleans up all resources of the newly created thread
via exit_thread(). exit_thread() invokes io_bitmap_exit() which
does the IO bitmap cleanups, which unfortunately assume that the
cleanup is related to the current task, which is obviously bogus.
Make it work correctly
- A lockdep fix in the resctrl code removed the clearing of the
command buffer in two places, which keeps stale error messages
around. Bring them back.
- Remove unused trace events"
* tag 'x86-urgent-2025-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
fs/resctrl: Restore the rdt_last_cmd_clear() calls after acquiring rdtgroup_mutex
x86/iopl: Cure TIF_IO_BITMAP inconsistencies
x86/fpu: Remove unused trace events
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fix from Thomas Gleixner:
"Add the missing seq_file forward declaration in the timer namespace
header"
* tag 'timers-urgent-2025-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
timens: Add struct seq_file forward declaration
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Add initial DMR support, which required smarter RAPL probe
Fix AMD MSR RAPL energy reporting
Add RAPL power limit configuration output
Minor fixes
Signed-off-by: Len Brown <len.brown@intel.com>
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Add initial support for BartlettLake.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Add initial support for DMR.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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for example:
intel-rapl:1: psys 28.0s:100W 976.0us:100W
intel-rapl:0: package-0 28.0s:57W,max:15W 2.4ms:57W
intel-rapl:0/intel-rapl:0:0: core disabled
intel-rapl:0/intel-rapl:0:1: uncore disabled
intel-rapl-mmio:0: package-0 28.0s:28W,max:15W 2.4ms:57W
[lenb: simplified format]
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
squish me
Signed-off-by: Len Brown <len.brown@intel.com>
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For the RAPL package energy status counter, Intel and AMD share the same
perf_subsys and perf_name, but with different MSR addresses.
Both rapl_counter_arch_infos[0] and rapl_counter_arch_infos[1] are
introduced to describe this counter for different Vendors.
As a result, the perf counter is probed twice, and causes a failure in
in get_rapl_counters() because expected_read_size and actual_read_size
don't match.
Fix the problem by skipping the already probed counter.
Note, this is not a perfect fix. For example, if different
vendors/platforms use the same MSR value for different purpose, the code
can be fooled when it probes a rapl_counter_arch_infos[] entry that does
not belong to the running Vendor/Platform.
In a long run, better to put rapl_counter_arch_infos[] into the
platform_features so that this becomes Vendor/Platform specific.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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cleared
platform_features->rapl_msrs describes the RAPL MSRs supported. While
RAPL Perf counters can be exposed from different kernel backend drivers,
e.g. RAPL MSR I/F driver, or RAPL TPMI I/F driver.
Thus, turbostat should first blindly probe all the available RAPL Perf
counters, and falls back to the RAPL MSR counters if they are listed in
platform_features->rapl_msrs.
With this, platforms that don't have RAPL MSRs can clear the
platform_features->rapl_msrs bits and use RAPL Perf counters only.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Increase the code readability by moving the no_perf/no_msr flag and the
cai->perf_name/cai->msr sanity checks into the counter probe functions.
No functional change.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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probe_rapl_msr() is reused for probing RAPL MSR counters, cstate MSR
counters and MPERF/APERF/SMI MSR counters, thus its name is misleading.
Similar to add_perf_counter(), introduce add_msr_counter() to probe a
counter via MSR. Introduce wrapper function add_rapl_msr_counter() at
the same time to add extra check for Zero return value for specified
RAPL counters.
No functional change intended.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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