The exported function name is dma_max_mapping_size(), not
dma_direct_max_mapping_size() so that this patch fixes
the function name in the documentation.

Fixes: 133d624b ("dma: Introduce dma_max_mapping_size()")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Some times integer power functions, such as int_sqrt(), are needed, but
there is nothing about them in the generated documentation.

Fill the gap by adding a reference to the corresponding exported functions.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Some times string helpers are needed, but there is nothing about them
in the generated documentation.

Fill the gap by adding a reference to string_helpers.c exported functions.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Work from Tobin Harding:

	Here is an updated version of the VFS doc conversion.  This series
	in no way represents a final point for the VFS documentation rather
	it is a small step towards getting VFS docs updated.  This series
	does not update the content of vfs.txt, only does formatting.

Currently vfs.rst does not render well into HTML the method descriptions
for VFS data structures.  We can improve the HTML output by putting the
description string on a new line following the method name.
Suggested-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

My previous fix miserably failed to catch all of the invocations of
"./scripts/sphinx-pre-install", so we got build errors.  Try again with
more caffeine.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Recent makefile changes included an invocation of
./scripts/sphinx-pre-install.  Unfortunately, that fails when a separate
build directory is in use with:

  /bin/bash: ./scripts/sphinx-pre-install: No such file or directory

Use $(srctree) to fully specify the location of this script.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

As discussed at the linux-doc ML, while we'll still support
version 1.3, it is time to recommend a more modern version.

So, let's switch the minimal requirements to Sphinx 1.7.9,
as it has the "-jauto" flag, with makes a lot faster when
building documentation.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Since Sphinx version 1.7, it is possible to use "-jauto" in
order to speedup documentation builds. On older versions,
while -j was already supported, one would need to set the
number of threads manually.

So, if SPHINXOPTS is not provided, add -jauto, in order to
speed up the build. That makes it *a lot* times faster than
without -j.

If one really wants to slow things down, it can just use:

	make SPHINXOPTS=-j1 htmldocs
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
[ jc: fixed perl magic to determine sphinx version ]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

At DT, files are being renamed to jason. Teach the script how to
handle such renames when used in fix mode.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

There's a false positive on perf/util:

	tools/perf/util/s390-cpumsf.c: Documentation/perf.data-file-format.txt

The file is there at tools/perf/Documentation/, but the logic
with detects relative documentation references inside tools is
not capable of detecting it.

So, improve it.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

There are at least two cases where a documentation file was gone
for good, but the text still mentions it:

1) drivers/vhost/vhost.c:
   the reference for Documentation/virtual/lguest/lguest.c is just
   to give credits to the original work that vhost replaced;

2) Documentation/scsi/scsi_mid_low_api.txt:
   It gives credit and mentions the old Documentation/Configure.help
   file that used to be part of Kernel 2.4.x

As we don't want to keep the script to keep pinpoint to those
every time, let's add a logic at the script to allow it to ignore
valid false-positives like the above.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Only seek for translation renames inside the translation
directory.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Call the script every time a make docs target is selected, on
a simplified check mode.

With this change, the script will set two vars:

$min_version - obtained from `needs_sphinx` var inside
	       conf.py (currently, '1.3')

$rec_version - obtained from sphinx/requirements.txt.

With those changes, a target like "make htmldocs" will do:

1) If no sphinx-build/sphinx-build3 is found, it will run
   the script on normal mode as before, checking for all
   system dependencies and providing install hints for the
   needed programs and will abort the build;

2) If no sphinx-build/sphinx-build3 is found, but there is
   a sphinx_${VER}/bin/activate file, and if
   ${VER} >= $min_version (string comparation), it will
   run in full mode, and will recommend to activate the
   virtualenv. If there are multiple virtualenvs, it
   will string sort the versions, recommending the
   highest version and will abort the build;

3) If Sphinx is detected but has a version lower than
   $min_version, it will run in full mode - with will
   recommend creating a virtual env using sphinx/requirements.txt,
   and will abort the build.

4) If Sphinx is detected and version is lower than
   $rec_version, it will run in full mode and will
   recommend creating a virtual env using sphinx/requirements.txt.

   In this case, it **won't** abort the build.

5) If Sphinx is detected and version is equal or righer than
   $rec_version it will return just after detecting the
   version ("quick mode"), not checking if are there any
   missing dependencies.

Just like before, if one wants to install Sphinx from the
distro, it has to call the script manually and use `--no-virtualenv`
argument to get the hints for his OS:

    You should run:

	sudo dnf install -y python3-sphinx python3-sphinx_rtd_theme

While here, add a small help for the three optional arguments
for the script.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

RHEL8 was already launched. This test won't get it, and will
do the wrong thing. Ok, we could fix it, but now we check
Sphinx version to ensure that it matches the minimal (1.3),
so there's no need for an explicit check there.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

It is possible that multiple Sphinx virtualenvs are installed
on a given kernel tree. Change the logic to get the latest
version of those, as this is probably what the user wants.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

vfs.txt is currently stale.  If we convert it to RST this is a good
first step in the process of getting the VFS documentation up to date.

This patch does the following (all as a single patch so as not to
introduce any new SPHINX build warnings)

 - Use '.. code-block:: c' for C code blocks and indent the code blocks.
 - Use double backticks for struct member descriptions.
 - Fix a couple of build warnings by guarding pointers (*) with double
   backticks .e.g  ``*ptr``.
 - Add vfs to Documentation/filesystems/index.rst

The member descriptions paragraph indentation was not touched.  It is
not pretty but these do not cause build warnings.  These descriptions
all need updating anyways so leave it as it is for now.
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

There are bunch of places with 8 spaces, in preparation for correctly
indenting all code snippets (during conversion to RST) change these to
use tabspaces.

This patch is whitespace only.

Convert instances of 8 consecutive spaces to a single tabspace.
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Currently file pre-amble contains custom indentation.  RST is not going
to like this, lets left-align the text.  Put the copyright notices in a
list in preparation for converting document to RST.
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Currently the licence is indicated via a custom string.  We have SPDX
license identifiers now for this task.

Use SPDX license identifier matching current license string.
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Kernel RST has a preferred heading adornment scheme.  Currently all the
heading adornments follow this scheme except the document heading.

Use correct heading adornment for initial heading.
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Currently spacing before and after headings is non-uniform.  Use two
blank lines before a heading and one after the heading.

Use uniform spacing around headings.
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

In preparation for conversion to RST format use the kernels favoured
documentation column width.  If we are going to do this we might as well
do it thoroughly.  Just do the paragraphs (not the indented stuff), the
rest will be done during indentation fix up patch.

This patch is whitespace only, no textual changes.

Use 72 character column width for all paragraph sections.
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Currently sometimes document has a single space after a period and
sometimes it has double.  Whichever we use it should be uniform.

Use double space after period, be uniform.
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Currently the file has a bunch of spaces before tabspaces.  This is a
nuisance when patching the file because they show up whenever we touch
these lines.  Let's just fix them all now in preparation for doing the
RST conversion.

Remove spaces before tabspaces.
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

The default behavior of hardlockup depends on the config of
CONFIG_BOOTPARAM_HARDLOCKUP_PANIC.

Fix the description of nmi_watchdog to make it clear.
Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

This patch fixes some spelling typos in histogram.rst
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

There's a new warning about a deprecation function. Add a
logic at cdomain.py to avoid that.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

The "no structured comments found" warning is not particularly useful if
there are several invocations, one of which is looking for something
wrong.  So if something specific has been requested, make it clear that
it's the one we weren't able to find.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Remove the kernel-doc directive for this file, since there's nothing there
and it generates a warning.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Remove the kernel-doc directive, since there are only warnings to be found
there.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/driver-api/target.rst is seeking kerneldoc comments in
drivers/target/target_core_device.c, but no such comments exist.  Take out
the kernel-doc directive and eliminate one warning from the build.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

There are no kerneldoc comments here, so looking for them just yields a
warning in the docs build.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

The stratix10 service layer documentation tried to include a kerneldoc
comments for a nonexistent struct; leading to a "no structured comments
found" message.  Switch it to stratix10_svc_command_config_type, which
appears at that spot in the sequence and was not included.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

There are no kerneldoc comments in this file, so do not attempt to
include them in the docs build.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

With Sphinx 2.0 (or prior versions with the deprecation warnings fixed) the
docs build fails with:

  Documentation/gpu/i915.rst:403: WARNING: Title level inconsistent:

  Global GTT Fence Handling
  ~~~~~~~~~~~~~~~~~~~~~~~~~

  reST markup error:
  Documentation/gpu/i915.rst:403: (SEVERE/4) Title level inconsistent:

I "fixed" it by changing the subsections in i915.rst, but that didn't seem
like the correct change.  It turns out that a couple of i915 files create
their own subsections in kerneldoc comments using apostrophes as the
heading marker:

  Layout
  ''''''

That breaks the normal subsection marker ordering, and newer Sphinx is
rather more strict about enforcing that ordering.  So fix the offending
comments to make Sphinx happy.

(This is unfortunate, in that kerneldoc comments shouldn't need to be aware
of where they might be included in the heading hierarchy, but I don't see
a better way around it).

Cc: stable@vger.kernel.org  # v4.14+
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

As we want to switch to a newer Sphinx version in the future,
add some version detected logic, checking if the current
version meets the requirement and suggesting upgrade it the
version is supported but too old.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Our version check in Documentation/conf.py never envisioned a world where
Sphinx moved beyond 1.x.  Now that the unthinkable has happened, fix our
version check to handle higher version numbers correctly.

Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

The conversion of acpi/enumeration.txt to RST included one markup error,
leading to many warnings like:

  .../firmware-guide/acpi/enumeration.rst:430: WARNING: Unexpected indentation.

Add the missing colon and create some peace.

Fixes: c24bc66e ("Documentation: ACPI: move enumeration.txt to firmware-guide/acpi and convert to reST")
Cc: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Commit 043b3f7b ("lib/list_sort: simplify and remove
MAX_LIST_LENGTH_BITS") added some useful kerneldoc info, but also broke the
docs build:

  ./lib/list_sort.c:128: WARNING: Definition list ends without a blank line; unexpected unindent.
  ./lib/list_sort.c:161: WARNING: Unexpected indentation.
  ./lib/list_sort.c:162: WARNING: Block quote ends without a blank line; unexpected unindent.

Fix the offending literal block and make the error go away.

Fixes: 043b3f7b ("lib/list_sort: simplify and remove MAX_LIST_LENGTH_BITS")
Cc: George Spelvin <lkml@sdf.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>