docs: ABI: move README contents to the top

The ABI documentation looks a little bit better if it starts
with the contents of the README is placed at the beginning.

Move it to the beginning of the A

docs: ABI: move README contents to the top

The ABI documentation looks a little bit better if it starts
with the contents of the README is placed at the beginning.

Move it to the beginning of the ABI chapter. While here, improve
the README text and change the title that will be shown at the
html/pdf output to be coherent with both ABI file contents and
with the generated documentation output.

Suggested-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20250211055809.1898623-1-mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

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scripts/get_abi.py: add support for undefined ABIs

The undefined logic is complex and has lots of magic on it.

Implement it, using the same algorithm we have at get_abi.pl. Yet,
some tweaks to opti

scripts/get_abi.py: add support for undefined ABIs

The undefined logic is complex and has lots of magic on it.

Implement it, using the same algorithm we have at get_abi.pl. Yet,
some tweaks to optimize performance and to make the code simpler
were added here:
- at the perl version, the tree graph had loops, so we had to
use BFS to traverse it. On this version, the graph is a tree,
so, it simplifies the what group for sysfs aliases;
- the logic which splits regular expressions into subgroups
was re-written to make it faster;
- it may optionally use multiple processes to search for symbol
matches;
- it has some additional debug levels.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/1529c255845d117696d5af57d8dc05554663afdf.1739182025.git.mchehab+huawei@kernel.org

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scripts/lib/abi/abi_parser.py: make it backward-compatible with Python 3.6

Despite being introduced on Python 3.6, the original implementation
was too limited: it doesn't accept anything but the arg

scripts/lib/abi/abi_parser.py: make it backward-compatible with Python 3.6

Despite being introduced on Python 3.6, the original implementation
was too limited: it doesn't accept anything but the argument.

Even on python 3.10.12, support was still limited, as more complex
operations cause SyntaxError:

Exception occurred:
File ".../linux/Documentation/sphinx/kernel_abi.py", line 48, in <module>
from get_abi import AbiParser
File ".../linux/scripts/lib/abi/abi_parser.py", line 525
msg += f"{part}\n{"-" * len(part)}\n\n"
^
SyntaxError: f-string: expecting '}'

Replace f-strings by normal string concatenation when it doesn't
work on Python 3.6.

Reported-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/41d2f85df134a46db46fed73a0f9697a3d2ae9ba.1739182025.git.mchehab+huawei@kernel.org

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scripts/lib/abi/abi_parser.py: Rename title name for ABI files

This makes them look better when generating cross-references.

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

scripts/lib/abi/abi_parser.py: Rename title name for ABI files

This makes them look better when generating cross-references.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/e44574cb2796861d6acbce839068ed3ef385d16c.1739182025.git.mchehab+huawei@kernel.org

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docs: sphinx/automarkup: add cross-references for ABI

Now that all ABI files are handled together, we can add a feature
at automarkup for it to generate cross-references for ABI symbols.

The cross-

docs: sphinx/automarkup: add cross-references for ABI

Now that all ABI files are handled together, we can add a feature
at automarkup for it to generate cross-references for ABI symbols.

The cross-reference logic can produce references for all existing
files, except for README (as this is not parsed).

For symbols, they need to be an exact match of what it is
described at the docs, which is not always true due to wildcards.

If symbols at /sys /proc and /config are identical, a cross-reference
will be used.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/0b97a51b68b1c20127ad4a6a55658557fe0848d0.1739182025.git.mchehab+huawei@kernel.org

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docs: sphinx/kernel_abi: parse ABI files only once

Right now, the logic parses ABI files on 4 steps, one for each
directory. While this is fine in principle, by doing that, not
all symbol cross-refe

docs: sphinx/kernel_abi: parse ABI files only once

Right now, the logic parses ABI files on 4 steps, one for each
directory. While this is fine in principle, by doing that, not
all symbol cross-references will be created.

Change the logic to do the parsing only once in order to get
a global dictionary to be used when creating ABI cross-references.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/5205c53838b6ea25f4cdd4cc1e3d17c0141e75a6.1739182025.git.mchehab+huawei@kernel.org

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scripts/get_abi.pl: add support to parse ABI README file

The Documentation/ABI/README file is currently outside the
documentation tree. Yet, it may still provide some useful
information. Add it to t

scripts/get_abi.pl: add support to parse ABI README file

The Documentation/ABI/README file is currently outside the
documentation tree. Yet, it may still provide some useful
information. Add it to the documentation parsing.

As a plus, this avoids a warning when detecting missing
cross-references.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/f1285dedfe4d0eb0f0af34f6a68bee6fde36dd7d.1739182025.git.mchehab+huawei@kernel.org

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scripts/get_abi.pl: Add filtering capabilities to rest output

This way, Sphinx ABI extension can parse symbols only once, while
keep displaying results in separate files.

Signed-off-by: Mauro Carva

scripts/get_abi.pl: Add filtering capabilities to rest output

This way, Sphinx ABI extension can parse symbols only once, while
keep displaying results in separate files.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/41e108e816e46434aa596e5c0d25d227cb9f0fe5.1739182025.git.mchehab+huawei@kernel.org

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docs: sphinx/kernel_abi: reduce buffer usage for ABI messages

Instead of producing a big message with all ABI contents and then
parse as a whole, simplify the code by handling each ABI symbol
in sep

docs: sphinx/kernel_abi: reduce buffer usage for ABI messages

Instead of producing a big message with all ABI contents and then
parse as a whole, simplify the code by handling each ABI symbol
in separate. As an additional benefit, there's no need to place
file/line nubers inlined at the data and use a regex to convert
them.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/15be22955e3c6df49d7256c8fd24f62b397ad0ff.1739182025.git.mchehab+huawei@kernel.org

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docs: sphinx/kernel_abi: use AbiParser directly

Instead of running get_abi.py script, import AbiParser class and
handle messages directly there using an interactor. This shold save some
memory, as t

docs: sphinx/kernel_abi: use AbiParser directly

Instead of running get_abi.py script, import AbiParser class and
handle messages directly there using an interactor. This shold save some
memory, as there's no need to exec python inside the Sphinx python
extension.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/8dbc244dcda97112c1b694e2512a5d600e62873b.1739182025.git.mchehab+huawei@kernel.org

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scripts/lib/abi/abi_parser.py: use an interactor for ReST output

Instead of printing all results line per line, use an interactor
to return each variable as a separate message.

This won't change mu

scripts/lib/abi/abi_parser.py: use an interactor for ReST output

Instead of printing all results line per line, use an interactor
to return each variable as a separate message.

This won't change much when using it via command line, but it
will help Sphinx integration by providing an interactor that
could be used there to handle ABI symbol by symbol.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/e3c94b8cdfd5e955aa19a703921f364a89089634.1739182025.git.mchehab+huawei@kernel.org

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scripts/lib/abi/abi_parser.py: optimize parse_abi() function

Instead of using glob, use a recursive function to parse all files.

Such change reduces the total excecution time by 15% with my SSD dis

scripts/lib/abi/abi_parser.py: optimize parse_abi() function

Instead of using glob, use a recursive function to parse all files.

Such change reduces the total excecution time by 15% with my SSD disks.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/190dd358897017ed82c56f1e263192215ffbae43.1739182025.git.mchehab+huawei@kernel.org

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scripts/get_abi.py: add support for symbol search

Add support for searching symbols from Documentation/ABI using
regular expressions to match the symbols' names.

Signed-off-by: Mauro Carvalho Cheha

scripts/get_abi.py: add support for symbol search

Add support for searching symbols from Documentation/ABI using
regular expressions to match the symbols' names.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/21b2c48657dde112d5417dcd7e0aa7cd383b9a0a.1739182025.git.mchehab+huawei@kernel.org

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scripts/get_abi.py: add a Python tool to generate ReST output

The get_abi.pl script is requiring some care, but it seems that
the number of changes on it since when I originally wrote it
was not too

scripts/get_abi.py: add a Python tool to generate ReST output

The get_abi.pl script is requiring some care, but it seems that
the number of changes on it since when I originally wrote it
was not too high.

Maintaining perl scripts without using classes requires a higher
efforted than on python, due to global variables management.
Also, it sounds easier to find python developer those days than
perl ones.

As a plus, using a Python class to handle ABI allows a better
integration with Sphinx extensions, allowing, for instance,
to let automarkup to generate cross-references for ABI
symbols.

With that in mind, rewrite the core of get_abi.pl in Python,
using classes, to help producing documentation. This will
allow a better integration in the future with the Sphinx
ABI extension.

The algorithms used there are the same as the ones in Perl,
with a couple of cleanups to remove redundant variables and
to help with cross-reference generation. While doing that,
remove some code that were important in the past, where
ABI files weren't using ReST format.

Some minor improvements were added like using a fixed seed
when generating ABI keys for duplicated names, making its
results reproductible.

The end script is a little bit faster than the original one
(tested on a machine with ssd disks). That's probably because
we're now using only pre-compiled regular expressions, and it
is using string replacement methods instead of regex where
possible.

The new version is a little bit more conservative when
converting text to cross-references to avoid adding them into
literal blocks.

To ensure that the ReST output is parsing all variables
and files properly, the end result was compared using diff
with the one produced by the perl script and showed no regressions.
There are minor improvements at the results, as it now
properly groups What on some special cases. It also better
escape some XREF names.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/71a894211a8b69664711144d9c4f8a0e73d1ae3c.1739182025.git.mchehab+huawei@kernel.org

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