litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

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itter Linus Torvalds <torvalds@g5.osdl.org> 2006-11-03 15:27:56 -0500 [PATCH] update some docbook comments' href='/cgit/cgit.cgi/litmus-rt-ext-res.git/commit/Documentation/kernel-doc-nano-HOWTO.txt?id=c6120938365df9976dc07c536e1c14190ead48e3'>c6120938365d

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kernel-doc nano-HOWTO
=====================

How to format kernel-doc comments
---------------------------------

In order to provide embedded, 'C' friendly, easy to maintain,
but consistent and extractable documentation of the functions and
data structures in the Linux kernel, the Linux kernel has adopted
a consistent style for documenting functions and their parameters,
and structures and their members.

The format for this documentation is called the kernel-doc format.
It is documented in this Documentation/kernel-doc-nano-HOWTO.txt file.

This style embeds the documentation within the source files, using
a few simple conventions.  The scripts/kernel-doc perl script, some
SGML templates in Documentation/DocBook, and other tools understand
these conventions, and are used to extract this embedded documentation
into various documents.

In order to provide good documentation of kernel functions and data
structures, please use the following conventions to format your
kernel-doc comments in Linux kernel source.

We definitely need kernel-doc formatted documentation for functions
that are exported to loadable modules using EXPORT_SYMBOL.

We also look to provide kernel-doc formatted documentation for
functions externally visible to other kernel files (not marked
"static").

We also recommend providing kernel-doc formatted documentation
for private (file "static") routines, for consistency of kernel
source code layout.  But this is lower priority and at the
discretion of the MAINTAINER of that kernel source file.

Data structures visible in kernel include files should also be
documented using kernel-doc formatted comments.

The opening comment mark "/**" is reserved for kernel-doc comments.
Only comments so marked will be considered by the kernel-doc scripts,
and any comment so marked must be in kernel-doc format.  Do not use
"/**" to be begin a comment block unless the comment block contains
kernel-doc formatted comments.  The closing comment marker for
kernel-doc comments can be either "*/" or "**/", but "*/" is
preferred in the Linux kernel tree.

Kernel-doc comments should be placed just before the function
or data structure being described.

Example kernel-doc function comment:

/**
 * foobar() - short function description of foobar
 * @arg1:	Describe the first argument to foobar.
 * @arg2:	Describe the second argument to foobar.
 *		One can provide multiple line descriptions
 *		for arguments.
 *
 * A longer description, with more discussion of the function foobar()
 * that might be useful to those using or modifying it.  Begins with
 * empty comment line, and may include additional embedded empty
 * comment lines.
 *
 * The longer description can have multiple paragraphs.
 *
 * Return: Describe the return value of foobar.
 */

The short description following the subject can span multiple lines
and ends with an @argument description, an empty line or the end of
the comment block.

The @argument descriptions must begin on the very next line following
this opening short function description line, with no intervening
empty comment lines.


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