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	docs: sphinxify coccinelle.txt and add it to dev-tools
No textual changes have been made, but the formatting has obviously been tweaked. Cc: Michal Marek <mmarek@suse.com> Cc: Gilles Muller <Gilles.Muller@lip6.fr> Acked-by: Nicolas Palix <nicolas.palix@imag.fr> Acked-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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			@ -1,10 +1,18 @@
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Copyright 2010 Nicolas Palix <npalix@diku.dk>
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Copyright 2010 Julia Lawall <julia@diku.dk>
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Copyright 2010 Gilles Muller <Gilles.Muller@lip6.fr>
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.. Copyright 2010 Nicolas Palix <npalix@diku.dk>
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.. Copyright 2010 Julia Lawall <julia@diku.dk>
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.. Copyright 2010 Gilles Muller <Gilles.Muller@lip6.fr>
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.. highlight:: none
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 Getting Coccinelle
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~~~~~~~~~~~~~~~~~~~~
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Coccinelle
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==========
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Coccinelle is a tool for pattern matching and text transformation that has
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many uses in kernel development, including the application of complex,
 | 
			
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tree-wide patches and detection of problematic programming patterns.
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Getting Coccinelle
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-------------------
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The semantic patches included in the kernel use features and options
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which are provided by Coccinelle version 1.0.0-rc11 and above.
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| 
						 | 
				
			
			@ -22,24 +30,23 @@ of many distributions, e.g. :
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 - NetBSD
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 - FreeBSD
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		||||
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		||||
You can get the latest version released from the Coccinelle homepage at
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http://coccinelle.lip6.fr/
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Information and tips about Coccinelle are also provided on the wiki
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		||||
pages at http://cocci.ekstranet.diku.dk/wiki/doku.php
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Once you have it, run the following command:
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Once you have it, run the following command::
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     	./configure
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        make
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as a regular user, and install it with
 | 
			
		||||
as a regular user, and install it with::
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        sudo make install
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 Supplemental documentation
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		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Supplemental documentation
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		||||
---------------------------
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For supplemental documentation refer to the wiki:
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| 
						 | 
				
			
			@ -47,49 +54,52 @@ https://bottest.wiki.kernel.org/coccicheck
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		||||
The wiki documentation always refers to the linux-next version of the script.
 | 
			
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		||||
 Using Coccinelle on the Linux kernel
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Using Coccinelle on the Linux kernel
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------------------------------------
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A Coccinelle-specific target is defined in the top level
 | 
			
		||||
Makefile. This target is named 'coccicheck' and calls the 'coccicheck'
 | 
			
		||||
front-end in the 'scripts' directory.
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		||||
Makefile. This target is named ``coccicheck`` and calls the ``coccicheck``
 | 
			
		||||
front-end in the ``scripts`` directory.
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Four basic modes are defined: patch, report, context, and org. The mode to
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use is specified by setting the MODE variable with 'MODE=<mode>'.
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Four basic modes are defined: ``patch``, ``report``, ``context``, and
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``org``. The mode to use is specified by setting the MODE variable with
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``MODE=<mode>``.
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'patch' proposes a fix, when possible.
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- ``patch`` proposes a fix, when possible.
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'report' generates a list in the following format:
 | 
			
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- ``report`` generates a list in the following format:
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  file:line:column-column: message
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'context' highlights lines of interest and their context in a
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diff-like style.Lines of interest are indicated with '-'.
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- ``context`` highlights lines of interest and their context in a
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  diff-like style.Lines of interest are indicated with ``-``.
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'org' generates a report in the Org mode format of Emacs.
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- ``org`` generates a report in the Org mode format of Emacs.
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 | 
			
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Note that not all semantic patches implement all modes. For easy use
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		||||
of Coccinelle, the default mode is "report".
 | 
			
		||||
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Two other modes provide some common combinations of these modes.
 | 
			
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'chain' tries the previous modes in the order above until one succeeds.
 | 
			
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- ``chain`` tries the previous modes in the order above until one succeeds.
 | 
			
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'rep+ctxt' runs successively the report mode and the context mode.
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- ``rep+ctxt`` runs successively the report mode and the context mode.
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  It should be used with the C option (described later)
 | 
			
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  which checks the code on a file basis.
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Examples:
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	To make a report for every semantic patch, run the following command:
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Examples
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~~~~~~~~
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To make a report for every semantic patch, run the following command::
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		make coccicheck MODE=report
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	To produce patches, run:
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To produce patches, run::
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		make coccicheck MODE=patch
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The coccicheck target applies every semantic patch available in the
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sub-directories of 'scripts/coccinelle' to the entire Linux kernel.
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sub-directories of ``scripts/coccinelle`` to the entire Linux kernel.
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For each semantic patch, a commit message is proposed.  It gives a
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description of the problem being checked by the semantic patch, and
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| 
						 | 
				
			
			@ -99,15 +109,15 @@ As any static code analyzer, Coccinelle produces false
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positives. Thus, reports must be carefully checked, and patches
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reviewed.
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To enable verbose messages set the V= variable, for example:
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To enable verbose messages set the V= variable, for example::
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   make coccicheck MODE=report V=1
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 Coccinelle parallelization
 | 
			
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Coccinelle parallelization
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---------------------------
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By default, coccicheck tries to run as parallel as possible. To change
 | 
			
		||||
the parallelism, set the J= variable. For example, to run across 4 CPUs:
 | 
			
		||||
the parallelism, set the J= variable. For example, to run across 4 CPUs::
 | 
			
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   make coccicheck MODE=report J=4
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| 
						 | 
				
			
			@ -115,44 +125,47 @@ As of Coccinelle 1.0.2 Coccinelle uses Ocaml parmap for parallelization,
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if support for this is detected you will benefit from parmap parallelization.
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When parmap is enabled coccicheck will enable dynamic load balancing by using
 | 
			
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'--chunksize 1' argument, this ensures we keep feeding threads with work
 | 
			
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``--chunksize 1`` argument, this ensures we keep feeding threads with work
 | 
			
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one by one, so that we avoid the situation where most work gets done by only
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a few threads. With dynamic load balancing, if a thread finishes early we keep
 | 
			
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feeding it more work.
 | 
			
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When parmap is enabled, if an error occurs in Coccinelle, this error
 | 
			
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value is propagated back, the return value of the 'make coccicheck'
 | 
			
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value is propagated back, the return value of the ``make coccicheck``
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captures this return value.
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 Using Coccinelle with a single semantic patch
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Using Coccinelle with a single semantic patch
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---------------------------------------------
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The optional make variable COCCI can be used to check a single
 | 
			
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semantic patch. In that case, the variable must be initialized with
 | 
			
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the name of the semantic patch to apply.
 | 
			
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For instance:
 | 
			
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For instance::
 | 
			
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	make coccicheck COCCI=<my_SP.cocci> MODE=patch
 | 
			
		||||
or
 | 
			
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 | 
			
		||||
or::
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		||||
	make coccicheck COCCI=<my_SP.cocci> MODE=report
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 Controlling Which Files are Processed by Coccinelle
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
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Controlling Which Files are Processed by Coccinelle
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---------------------------------------------------
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By default the entire kernel source tree is checked.
 | 
			
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To apply Coccinelle to a specific directory, M= can be used.
 | 
			
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For example, to check drivers/net/wireless/ one may write:
 | 
			
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To apply Coccinelle to a specific directory, ``M=`` can be used.
 | 
			
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For example, to check drivers/net/wireless/ one may write::
 | 
			
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    make coccicheck M=drivers/net/wireless/
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To apply Coccinelle on a file basis, instead of a directory basis, the
 | 
			
		||||
following command may be used:
 | 
			
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following command may be used::
 | 
			
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    make C=1 CHECK="scripts/coccicheck"
 | 
			
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To check only newly edited code, use the value 2 for the C flag, i.e.
 | 
			
		||||
To check only newly edited code, use the value 2 for the C flag, i.e.::
 | 
			
		||||
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		||||
    make C=2 CHECK="scripts/coccicheck"
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		||||
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		||||
| 
						 | 
				
			
			@ -166,8 +179,8 @@ semantic patch as shown in the previous section.
 | 
			
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The "report" mode is the default. You can select another one with the
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MODE variable explained above.
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 Debugging Coccinelle SmPL patches
 | 
			
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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		||||
Debugging Coccinelle SmPL patches
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---------------------------------
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Using coccicheck is best as it provides in the spatch command line
 | 
			
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include options matching the options used when we compile the kernel.
 | 
			
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| 
						 | 
				
			
			@ -177,8 +190,8 @@ manually run Coccinelle with debug options added.
 | 
			
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Alternatively you can debug running Coccinelle against SmPL patches
 | 
			
		||||
by asking for stderr to be redirected to stderr, by default stderr
 | 
			
		||||
is redirected to /dev/null, if you'd like to capture stderr you
 | 
			
		||||
can specify the DEBUG_FILE="file.txt" option to coccicheck. For
 | 
			
		||||
instance:
 | 
			
		||||
can specify the ``DEBUG_FILE="file.txt"`` option to coccicheck. For
 | 
			
		||||
instance::
 | 
			
		||||
 | 
			
		||||
    rm -f cocci.err
 | 
			
		||||
    make coccicheck COCCI=scripts/coccinelle/free/kfree.cocci MODE=report DEBUG_FILE=cocci.err
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| 
						 | 
				
			
			@ -186,7 +199,7 @@ instance:
 | 
			
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You can use SPFLAGS to add debugging flags, for instance you may want to
 | 
			
		||||
add both --profile --show-trying to SPFLAGS when debugging. For instance
 | 
			
		||||
you may want to use:
 | 
			
		||||
you may want to use::
 | 
			
		||||
 | 
			
		||||
    rm -f err.log
 | 
			
		||||
    export COCCI=scripts/coccinelle/misc/irqf_oneshot.cocci
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| 
						 | 
				
			
			@ -198,24 +211,24 @@ work.
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		||||
DEBUG_FILE support is only supported when using coccinelle >= 1.2.
 | 
			
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 .cocciconfig support
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
.cocciconfig support
 | 
			
		||||
--------------------
 | 
			
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 | 
			
		||||
Coccinelle supports reading .cocciconfig for default Coccinelle options that
 | 
			
		||||
should be used every time spatch is spawned, the order of precedence for
 | 
			
		||||
variables for .cocciconfig is as follows:
 | 
			
		||||
 | 
			
		||||
  o Your current user's home directory is processed first
 | 
			
		||||
  o Your directory from which spatch is called is processed next
 | 
			
		||||
  o The directory provided with the --dir option is processed last, if used
 | 
			
		||||
- Your current user's home directory is processed first
 | 
			
		||||
- Your directory from which spatch is called is processed next
 | 
			
		||||
- The directory provided with the --dir option is processed last, if used
 | 
			
		||||
 | 
			
		||||
Since coccicheck runs through make, it naturally runs from the kernel
 | 
			
		||||
proper dir, as such the second rule above would be implied for picking up a
 | 
			
		||||
.cocciconfig when using 'make coccicheck'.
 | 
			
		||||
.cocciconfig when using ``make coccicheck``.
 | 
			
		||||
 | 
			
		||||
'make coccicheck' also supports using M= targets.If you do not supply
 | 
			
		||||
``make coccicheck`` also supports using M= targets.If you do not supply
 | 
			
		||||
any M= target, it is assumed you want to target the entire kernel.
 | 
			
		||||
The kernel coccicheck script has:
 | 
			
		||||
The kernel coccicheck script has::
 | 
			
		||||
 | 
			
		||||
    if [ "$KBUILD_EXTMOD" = "" ] ; then
 | 
			
		||||
        OPTIONS="--dir $srctree $COCCIINCLUDE"
 | 
			
		||||
| 
						 | 
				
			
			@ -235,12 +248,12 @@ override any of the kernel's .coccicheck's settings using SPFLAGS.
 | 
			
		|||
 | 
			
		||||
We help Coccinelle when used against Linux with a set of sensible defaults
 | 
			
		||||
options for Linux with our own Linux .cocciconfig. This hints to coccinelle
 | 
			
		||||
git can be used for 'git grep' queries over coccigrep. A timeout of 200
 | 
			
		||||
git can be used for ``git grep`` queries over coccigrep. A timeout of 200
 | 
			
		||||
seconds should suffice for now.
 | 
			
		||||
 | 
			
		||||
The options picked up by coccinelle when reading a .cocciconfig do not appear
 | 
			
		||||
as arguments to spatch processes running on your system, to confirm what
 | 
			
		||||
options will be used by Coccinelle run:
 | 
			
		||||
options will be used by Coccinelle run::
 | 
			
		||||
 | 
			
		||||
      spatch --print-options-only
 | 
			
		||||
 | 
			
		||||
| 
						 | 
				
			
			@ -252,219 +265,227 @@ carries its own .cocciconfig, you will need to use SPFLAGS to use idutils if
 | 
			
		|||
desired. See below section "Additional flags" for more details on how to use
 | 
			
		||||
idutils.
 | 
			
		||||
 | 
			
		||||
 Additional flags
 | 
			
		||||
~~~~~~~~~~~~~~~~~~
 | 
			
		||||
Additional flags
 | 
			
		||||
----------------
 | 
			
		||||
 | 
			
		||||
Additional flags can be passed to spatch through the SPFLAGS
 | 
			
		||||
variable. This works as Coccinelle respects the last flags
 | 
			
		||||
given to it when options are in conflict.
 | 
			
		||||
given to it when options are in conflict. ::
 | 
			
		||||
 | 
			
		||||
    make SPFLAGS=--use-glimpse coccicheck
 | 
			
		||||
 | 
			
		||||
Coccinelle supports idutils as well but requires coccinelle >= 1.0.6.
 | 
			
		||||
When no ID file is specified coccinelle assumes your ID database file
 | 
			
		||||
is in the file .id-utils.index on the top level of the kernel, coccinelle
 | 
			
		||||
carries a script scripts/idutils_index.sh which creates the database with
 | 
			
		||||
carries a script scripts/idutils_index.sh which creates the database with::
 | 
			
		||||
 | 
			
		||||
    mkid -i C --output .id-utils.index
 | 
			
		||||
 | 
			
		||||
If you have another database filename you can also just symlink with this
 | 
			
		||||
name.
 | 
			
		||||
name. ::
 | 
			
		||||
 | 
			
		||||
    make SPFLAGS=--use-idutils coccicheck
 | 
			
		||||
 | 
			
		||||
Alternatively you can specify the database filename explicitly, for
 | 
			
		||||
instance:
 | 
			
		||||
instance::
 | 
			
		||||
 | 
			
		||||
    make SPFLAGS="--use-idutils /full-path/to/ID" coccicheck
 | 
			
		||||
 | 
			
		||||
See spatch --help to learn more about spatch options.
 | 
			
		||||
See ``spatch --help`` to learn more about spatch options.
 | 
			
		||||
 | 
			
		||||
Note that the '--use-glimpse' and '--use-idutils' options
 | 
			
		||||
Note that the ``--use-glimpse`` and ``--use-idutils`` options
 | 
			
		||||
require external tools for indexing the code. None of them is
 | 
			
		||||
thus active by default. However, by indexing the code with
 | 
			
		||||
one of these tools, and according to the cocci file used,
 | 
			
		||||
spatch could proceed the entire code base more quickly.
 | 
			
		||||
 | 
			
		||||
 SmPL patch specific options
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
SmPL patch specific options
 | 
			
		||||
---------------------------
 | 
			
		||||
 | 
			
		||||
SmPL patches can have their own requirements for options passed
 | 
			
		||||
to Coccinelle. SmPL patch specific options can be provided by
 | 
			
		||||
providing them at the top of the SmPL patch, for instance:
 | 
			
		||||
providing them at the top of the SmPL patch, for instance::
 | 
			
		||||
 | 
			
		||||
// Options: --no-includes --include-headers
 | 
			
		||||
	// Options: --no-includes --include-headers
 | 
			
		||||
 | 
			
		||||
 SmPL patch Coccinelle requirements
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
SmPL patch Coccinelle requirements
 | 
			
		||||
----------------------------------
 | 
			
		||||
 | 
			
		||||
As Coccinelle features get added some more advanced SmPL patches
 | 
			
		||||
may require newer versions of Coccinelle. If an SmPL patch requires
 | 
			
		||||
at least a version of Coccinelle, this can be specified as follows,
 | 
			
		||||
as an example if requiring at least Coccinelle >= 1.0.5:
 | 
			
		||||
as an example if requiring at least Coccinelle >= 1.0.5::
 | 
			
		||||
 | 
			
		||||
// Requires: 1.0.5
 | 
			
		||||
	// Requires: 1.0.5
 | 
			
		||||
 | 
			
		||||
 Proposing new semantic patches
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
Proposing new semantic patches
 | 
			
		||||
-------------------------------
 | 
			
		||||
 | 
			
		||||
New semantic patches can be proposed and submitted by kernel
 | 
			
		||||
developers. For sake of clarity, they should be organized in the
 | 
			
		||||
sub-directories of 'scripts/coccinelle/'.
 | 
			
		||||
sub-directories of ``scripts/coccinelle/``.
 | 
			
		||||
 | 
			
		||||
 | 
			
		||||
 Detailed description of the 'report' mode
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
Detailed description of the ``report`` mode
 | 
			
		||||
-------------------------------------------
 | 
			
		||||
 | 
			
		||||
``report`` generates a list in the following format::
 | 
			
		||||
 | 
			
		||||
'report' generates a list in the following format:
 | 
			
		||||
  file:line:column-column: message
 | 
			
		||||
 | 
			
		||||
Example:
 | 
			
		||||
Example
 | 
			
		||||
~~~~~~~
 | 
			
		||||
 | 
			
		||||
Running
 | 
			
		||||
Running::
 | 
			
		||||
 | 
			
		||||
	make coccicheck MODE=report COCCI=scripts/coccinelle/api/err_cast.cocci
 | 
			
		||||
 | 
			
		||||
will execute the following part of the SmPL script.
 | 
			
		||||
will execute the following part of the SmPL script::
 | 
			
		||||
 | 
			
		||||
<smpl>
 | 
			
		||||
@r depends on !context && !patch && (org || report)@
 | 
			
		||||
expression x;
 | 
			
		||||
position p;
 | 
			
		||||
@@
 | 
			
		||||
   <smpl>
 | 
			
		||||
   @r depends on !context && !patch && (org || report)@
 | 
			
		||||
   expression x;
 | 
			
		||||
   position p;
 | 
			
		||||
   @@
 | 
			
		||||
 | 
			
		||||
     ERR_PTR@p(PTR_ERR(x))
 | 
			
		||||
 | 
			
		||||
@script:python depends on report@
 | 
			
		||||
p << r.p;
 | 
			
		||||
x << r.x;
 | 
			
		||||
@@
 | 
			
		||||
   @script:python depends on report@
 | 
			
		||||
   p << r.p;
 | 
			
		||||
   x << r.x;
 | 
			
		||||
   @@
 | 
			
		||||
 | 
			
		||||
msg="ERR_CAST can be used with %s" % (x)
 | 
			
		||||
coccilib.report.print_report(p[0], msg)
 | 
			
		||||
</smpl>
 | 
			
		||||
   msg="ERR_CAST can be used with %s" % (x)
 | 
			
		||||
   coccilib.report.print_report(p[0], msg)
 | 
			
		||||
   </smpl>
 | 
			
		||||
 | 
			
		||||
This SmPL excerpt generates entries on the standard output, as
 | 
			
		||||
illustrated below:
 | 
			
		||||
illustrated below::
 | 
			
		||||
 | 
			
		||||
/home/user/linux/crypto/ctr.c:188:9-16: ERR_CAST can be used with alg
 | 
			
		||||
/home/user/linux/crypto/authenc.c:619:9-16: ERR_CAST can be used with auth
 | 
			
		||||
/home/user/linux/crypto/xts.c:227:9-16: ERR_CAST can be used with alg
 | 
			
		||||
    /home/user/linux/crypto/ctr.c:188:9-16: ERR_CAST can be used with alg
 | 
			
		||||
    /home/user/linux/crypto/authenc.c:619:9-16: ERR_CAST can be used with auth
 | 
			
		||||
    /home/user/linux/crypto/xts.c:227:9-16: ERR_CAST can be used with alg
 | 
			
		||||
 | 
			
		||||
 | 
			
		||||
 Detailed description of the 'patch' mode
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
Detailed description of the ``patch`` mode
 | 
			
		||||
------------------------------------------
 | 
			
		||||
 | 
			
		||||
When the 'patch' mode is available, it proposes a fix for each problem
 | 
			
		||||
When the ``patch`` mode is available, it proposes a fix for each problem
 | 
			
		||||
identified.
 | 
			
		||||
 | 
			
		||||
Example:
 | 
			
		||||
Example
 | 
			
		||||
~~~~~~~
 | 
			
		||||
 | 
			
		||||
Running::
 | 
			
		||||
 | 
			
		||||
Running
 | 
			
		||||
	make coccicheck MODE=patch COCCI=scripts/coccinelle/api/err_cast.cocci
 | 
			
		||||
 | 
			
		||||
will execute the following part of the SmPL script.
 | 
			
		||||
will execute the following part of the SmPL script::
 | 
			
		||||
 | 
			
		||||
<smpl>
 | 
			
		||||
@ depends on !context && patch && !org && !report @
 | 
			
		||||
expression x;
 | 
			
		||||
@@
 | 
			
		||||
    <smpl>
 | 
			
		||||
    @ depends on !context && patch && !org && !report @
 | 
			
		||||
    expression x;
 | 
			
		||||
    @@
 | 
			
		||||
 | 
			
		||||
- ERR_PTR(PTR_ERR(x))
 | 
			
		||||
+ ERR_CAST(x)
 | 
			
		||||
</smpl>
 | 
			
		||||
    - ERR_PTR(PTR_ERR(x))
 | 
			
		||||
    + ERR_CAST(x)
 | 
			
		||||
    </smpl>
 | 
			
		||||
 | 
			
		||||
This SmPL excerpt generates patch hunks on the standard output, as
 | 
			
		||||
illustrated below:
 | 
			
		||||
illustrated below::
 | 
			
		||||
 | 
			
		||||
diff -u -p a/crypto/ctr.c b/crypto/ctr.c
 | 
			
		||||
--- a/crypto/ctr.c 2010-05-26 10:49:38.000000000 +0200
 | 
			
		||||
+++ b/crypto/ctr.c 2010-06-03 23:44:49.000000000 +0200
 | 
			
		||||
@@ -185,7 +185,7 @@ static struct crypto_instance *crypto_ct
 | 
			
		||||
    diff -u -p a/crypto/ctr.c b/crypto/ctr.c
 | 
			
		||||
    --- a/crypto/ctr.c 2010-05-26 10:49:38.000000000 +0200
 | 
			
		||||
    +++ b/crypto/ctr.c 2010-06-03 23:44:49.000000000 +0200
 | 
			
		||||
    @@ -185,7 +185,7 @@ static struct crypto_instance *crypto_ct
 | 
			
		||||
 	alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
 | 
			
		||||
 				  CRYPTO_ALG_TYPE_MASK);
 | 
			
		||||
 	if (IS_ERR(alg))
 | 
			
		||||
-		return ERR_PTR(PTR_ERR(alg));
 | 
			
		||||
+		return ERR_CAST(alg);
 | 
			
		||||
    -		return ERR_PTR(PTR_ERR(alg));
 | 
			
		||||
    +		return ERR_CAST(alg);
 | 
			
		||||
 | 
			
		||||
 	/* Block size must be >= 4 bytes. */
 | 
			
		||||
 	err = -EINVAL;
 | 
			
		||||
 | 
			
		||||
 Detailed description of the 'context' mode
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
Detailed description of the ``context`` mode
 | 
			
		||||
--------------------------------------------
 | 
			
		||||
 | 
			
		||||
'context' highlights lines of interest and their context
 | 
			
		||||
``context`` highlights lines of interest and their context
 | 
			
		||||
in a diff-like style.
 | 
			
		||||
 | 
			
		||||
NOTE: The diff-like output generated is NOT an applicable patch. The
 | 
			
		||||
      intent of the 'context' mode is to highlight the important lines
 | 
			
		||||
      (annotated with minus, '-') and gives some surrounding context
 | 
			
		||||
      **NOTE**: The diff-like output generated is NOT an applicable patch. The
 | 
			
		||||
      intent of the ``context`` mode is to highlight the important lines
 | 
			
		||||
      (annotated with minus, ``-``) and gives some surrounding context
 | 
			
		||||
      lines around. This output can be used with the diff mode of
 | 
			
		||||
      Emacs to review the code.
 | 
			
		||||
 | 
			
		||||
Example:
 | 
			
		||||
Example
 | 
			
		||||
~~~~~~~
 | 
			
		||||
 | 
			
		||||
Running::
 | 
			
		||||
 | 
			
		||||
Running
 | 
			
		||||
	make coccicheck MODE=context COCCI=scripts/coccinelle/api/err_cast.cocci
 | 
			
		||||
 | 
			
		||||
will execute the following part of the SmPL script.
 | 
			
		||||
will execute the following part of the SmPL script::
 | 
			
		||||
 | 
			
		||||
<smpl>
 | 
			
		||||
@ depends on context && !patch && !org && !report@
 | 
			
		||||
expression x;
 | 
			
		||||
@@
 | 
			
		||||
    <smpl>
 | 
			
		||||
    @ depends on context && !patch && !org && !report@
 | 
			
		||||
    expression x;
 | 
			
		||||
    @@
 | 
			
		||||
 | 
			
		||||
* ERR_PTR(PTR_ERR(x))
 | 
			
		||||
</smpl>
 | 
			
		||||
    * ERR_PTR(PTR_ERR(x))
 | 
			
		||||
    </smpl>
 | 
			
		||||
 | 
			
		||||
This SmPL excerpt generates diff hunks on the standard output, as
 | 
			
		||||
illustrated below:
 | 
			
		||||
illustrated below::
 | 
			
		||||
 | 
			
		||||
diff -u -p /home/user/linux/crypto/ctr.c /tmp/nothing
 | 
			
		||||
--- /home/user/linux/crypto/ctr.c	2010-05-26 10:49:38.000000000 +0200
 | 
			
		||||
+++ /tmp/nothing
 | 
			
		||||
@@ -185,7 +185,6 @@ static struct crypto_instance *crypto_ct
 | 
			
		||||
    diff -u -p /home/user/linux/crypto/ctr.c /tmp/nothing
 | 
			
		||||
    --- /home/user/linux/crypto/ctr.c	2010-05-26 10:49:38.000000000 +0200
 | 
			
		||||
    +++ /tmp/nothing
 | 
			
		||||
    @@ -185,7 +185,6 @@ static struct crypto_instance *crypto_ct
 | 
			
		||||
 	alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
 | 
			
		||||
 				  CRYPTO_ALG_TYPE_MASK);
 | 
			
		||||
 	if (IS_ERR(alg))
 | 
			
		||||
-		return ERR_PTR(PTR_ERR(alg));
 | 
			
		||||
    -		return ERR_PTR(PTR_ERR(alg));
 | 
			
		||||
 | 
			
		||||
 	/* Block size must be >= 4 bytes. */
 | 
			
		||||
 	err = -EINVAL;
 | 
			
		||||
 | 
			
		||||
 Detailed description of the 'org' mode
 | 
			
		||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | 
			
		||||
Detailed description of the ``org`` mode
 | 
			
		||||
----------------------------------------
 | 
			
		||||
 | 
			
		||||
'org' generates a report in the Org mode format of Emacs.
 | 
			
		||||
``org`` generates a report in the Org mode format of Emacs.
 | 
			
		||||
 | 
			
		||||
Example:
 | 
			
		||||
Example
 | 
			
		||||
~~~~~~~
 | 
			
		||||
 | 
			
		||||
Running::
 | 
			
		||||
 | 
			
		||||
Running
 | 
			
		||||
	make coccicheck MODE=org COCCI=scripts/coccinelle/api/err_cast.cocci
 | 
			
		||||
 | 
			
		||||
will execute the following part of the SmPL script.
 | 
			
		||||
will execute the following part of the SmPL script::
 | 
			
		||||
 | 
			
		||||
<smpl>
 | 
			
		||||
@r depends on !context && !patch && (org || report)@
 | 
			
		||||
expression x;
 | 
			
		||||
position p;
 | 
			
		||||
@@
 | 
			
		||||
    <smpl>
 | 
			
		||||
    @r depends on !context && !patch && (org || report)@
 | 
			
		||||
    expression x;
 | 
			
		||||
    position p;
 | 
			
		||||
    @@
 | 
			
		||||
 | 
			
		||||
      ERR_PTR@p(PTR_ERR(x))
 | 
			
		||||
 | 
			
		||||
@script:python depends on org@
 | 
			
		||||
p << r.p;
 | 
			
		||||
x << r.x;
 | 
			
		||||
@@
 | 
			
		||||
    @script:python depends on org@
 | 
			
		||||
    p << r.p;
 | 
			
		||||
    x << r.x;
 | 
			
		||||
    @@
 | 
			
		||||
 | 
			
		||||
msg="ERR_CAST can be used with %s" % (x)
 | 
			
		||||
msg_safe=msg.replace("[","@(").replace("]",")")
 | 
			
		||||
coccilib.org.print_todo(p[0], msg_safe)
 | 
			
		||||
</smpl>
 | 
			
		||||
    msg="ERR_CAST can be used with %s" % (x)
 | 
			
		||||
    msg_safe=msg.replace("[","@(").replace("]",")")
 | 
			
		||||
    coccilib.org.print_todo(p[0], msg_safe)
 | 
			
		||||
    </smpl>
 | 
			
		||||
 | 
			
		||||
This SmPL excerpt generates Org entries on the standard output, as
 | 
			
		||||
illustrated below:
 | 
			
		||||
illustrated below::
 | 
			
		||||
 | 
			
		||||
* TODO [[view:/home/user/linux/crypto/ctr.c::face=ovl-face1::linb=188::colb=9::cole=16][ERR_CAST can be used with alg]]
 | 
			
		||||
* TODO [[view:/home/user/linux/crypto/authenc.c::face=ovl-face1::linb=619::colb=9::cole=16][ERR_CAST can be used with auth]]
 | 
			
		||||
* TODO [[view:/home/user/linux/crypto/xts.c::face=ovl-face1::linb=227::colb=9::cole=16][ERR_CAST can be used with alg]]
 | 
			
		||||
    * TODO [[view:/home/user/linux/crypto/ctr.c::face=ovl-face1::linb=188::colb=9::cole=16][ERR_CAST can be used with alg]]
 | 
			
		||||
    * TODO [[view:/home/user/linux/crypto/authenc.c::face=ovl-face1::linb=619::colb=9::cole=16][ERR_CAST can be used with auth]]
 | 
			
		||||
    * TODO [[view:/home/user/linux/crypto/xts.c::face=ovl-face1::linb=227::colb=9::cole=16][ERR_CAST can be used with alg]]
 | 
			
		||||
| 
						 | 
				
			
			@ -14,3 +14,4 @@ whole; patches welcome!
 | 
			
		|||
.. toctree::
 | 
			
		||||
   :maxdepth: 2
 | 
			
		||||
 | 
			
		||||
   coccinelle
 | 
			
		||||
| 
						 | 
				
			
			
 | 
			
		|||
| 
						 | 
				
			
			@ -3124,7 +3124,7 @@ L:	cocci@systeme.lip6.fr (moderated for non-subscribers)
 | 
			
		|||
T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild.git misc
 | 
			
		||||
W:	http://coccinelle.lip6.fr/
 | 
			
		||||
S:	Supported
 | 
			
		||||
F:	Documentation/coccinelle.txt
 | 
			
		||||
F:	Documentation/dev-tools/coccinelle.rst
 | 
			
		||||
F:	scripts/coccinelle/
 | 
			
		||||
F:	scripts/coccicheck
 | 
			
		||||
 | 
			
		||||
| 
						 | 
				
			
			
 | 
			
		|||
		Loading…
	
		Reference in a new issue