linux-kernel - Re: [PATCH 2/6] Coccinelle: Update documentation

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Date:	Wed, 13 Oct 2010 00:49:07 +0200
From:	Nicolas Palix <Nicolas.Palix@...ia.fr>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Julia Lawall <julia@...u.dk>, Michal Marek <mmarek@...e.cz>,
	Kulikov Vasiliy <segooon@...il.com>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Sam Ravnborg <sam@...nborg.org>,
	Joerg Roedel <joerg.roedel@....com>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	cocci@...u.dk
Subject: Re: [PATCH 2/6] Coccinelle: Update documentation

 - Add information about use of the C={1,2} make flag
 - Add a description of the new chain mode mechanism
 - Add a link to the wiki

Signed-off-by: Nicolas Palix <npalix.work@...il.com>
Signed-off-by: Julia Lawall <julia@...u.dk>
---
This is a resubmission that fixes trailing whitespaces and a typo.

 Documentation/coccinelle.txt |   42 +++++++++++++++++++++++++++++++++++-------
 1 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/Documentation/coccinelle.txt b/Documentation/coccinelle.txt
index cd2b028..de51a3e 100644
--- a/Documentation/coccinelle.txt
+++ b/Documentation/coccinelle.txt
@@ -24,6 +24,9 @@ of many distributions, e.g. :
 You can get the latest version released from the Coccinelle homepage at
 http://coccinelle.lip6.fr/

+Information and tips about Coccinelle are also provided on the wiki
+pages at http://cocci.ekstranet.diku.dk/wiki/doku.php
+
 Once you have it, run the following command:

      	./configure
@@ -41,20 +44,22 @@ 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.

-Four modes are defined: report, patch, context, and org. The mode to
+Four modes are defined: patch, report, context, and org. The mode to
 use is specified by setting the MODE variable with 'MODE=<mode>'.

+'patch' proposes a fix, when possible.
+
 'report' generates a list in the following format:
   file:line:column-column: message

-'patch' proposes a fix, when possible.
-
 'context' highlights lines of interest and their context in a
 diff-like style.Lines of interest are indicated with '-'.

 'org' generates a report in the Org mode format of Emacs.

-Note that not all semantic patches implement all modes.
+Note that not all semantic patches implement all modes. For easy use
+of Coccinelle, the default mode is "chain" which tries the previous
+modes in the order above until one succeeds.

 To make a report for every semantic patch, run the following command:

@@ -68,9 +73,9 @@ To produce patches, run:


 The coccicheck target applies every semantic patch available in the
-subdirectories of 'scripts/coccinelle' to the entire Linux kernel.
+sub-directories of 'scripts/coccinelle' to the entire Linux kernel.

-For each semantic patch, a changelog message is proposed.  It gives a
+For each semantic patch, a commit message is proposed.  It gives a
 description of the problem being checked by the semantic patch, and
 includes a reference to Coccinelle.

@@ -93,12 +98,35 @@ or
 	make coccicheck COCCI=<my_SP.cocci> MODE=report


+ Using Coccinelle on (modified) files
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To apply Coccinelle on a file basis, instead of a directory basis, the
+following command may be used:
+
+    make C=1 CHECK="scripts/coccicheck"
+
+To check only newly edited code, use the value 2 for the C flag, i.e.
+
+    make C=2 CHECK="scripts/coccicheck"
+
+This runs every semantic patch in scripts/coccinelle by default. The
+COCCI variable may additionally be used to only apply a single
+semantic patch as shown in the previous section.
+
+The "chain" mode is the default. You can select another one with the
+MODE variable explained above.
+
+In this mode, there is no information about semantic patches
+displayed, and no commit message proposed.
+
+
  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
-subdirectories of 'scripts/coccinelle/'.
+sub-directories of 'scripts/coccinelle/'.


  Detailed description of the 'report' mode
--
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