coccicheck: modernize

There were quite a bit of comments from the v3 series [0], since there was quite a bit of review needed for some other changes I've had discussions with Nicolas and Julia privately over these changes and collected their Acks privately to avoid unnecessary e-mail waste. I've annotated the changes in the commit log with any changes done in the v4 series. If most importance is the use of .cocciconfig, update of the documentation and recommending an upgrade of coccinelle for users wishing to use idutils. A future 1.0.6 release of coccinellew will support it best.

This series is rebased on top of linux-next tag next-20160629, I've put up a branch of these changes up on my linux-next tree, the branch is 20160629-coccicheck-v4 [1].

[0] https://lkml.kernel.org/r/1466536893-23355-1-git-send-email-mcgrof at kernel.org
[1] https://git.kernel.org/cgit/linux/kernel/git/mcgrof/linux-next.git/log/?h=20160629-coccicheck-v4

Luis R. Rodriguez (9):
coccicheck: move spatch binary check up
coccicheck: make SPFLAGS more useful
coccicheck: enable parmap support
coccicheck: add support for DEBUG_FILE
coccicheck: replace --very-quiet with --quiet when debugging
scripts: add Linux .cocciconfig for coccinelle
coccicheck: add support for requring a coccinelle version
coccicheck: refer to Documentation/coccinelle.txt and wiki scripts/coccinelle: require coccinelle >= 1.0.4 on
device_node_continue.cocci

 .cocciconfig                                       |   3 +
 .gitignore                                         |   1 +
 Documentation/coccinelle.txt                       | 148 ++++++++++++++++++++-
 scripts/coccicheck                                 |  94 +++++++++++--
 .../iterators/device_node_continue.cocci           |   3 +
 5 files changed, 239 insertions(+), 10 deletions(-)
 create mode 100644 .cocciconfig

2.8.4

This has no functional changes. This is being done to enable us to later use spatch binary for some flag checking for certain features early on.

---
 scripts/coccicheck | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

index f6627863fdc3..f137b04dfdd3 100755
@@ -7,6 +7,11 @@
 
 SPATCH="`which ${SPATCH:=spatch}`"
 
+if [ ! -x "$SPATCH" ]; then
+    echo 'spatch is part of the Coccinelle project and is available at http://coccinelle.lip6.fr/'
+    exit 1
+fi
+
 trap kill_running SIGTERM SIGINT
 declare -a SPATCH_PID
 

@@ -51,11 +56,6 @@ if [ "$KBUILD_EXTMOD" != "" ] ; then
     OPTIONS="--patch $srctree $OPTIONS"
 fi
 
-if [ ! -x "$SPATCH" ]; then
-    echo 'spatch is part of the Coccinelle project and is available at http://coccinelle.lip6.fr/'
-    exit 1
-fi
-
 if [ "$MODE" = "" ] ; then
     if [ "$ONLINE" = "0" ] ; then
 	echo 'You have not explicitly specified the mode to use. Using default "report" mode.'

2.8.4

SPFLAGS is set early, it means that any heuristics done on coccicheck cannot be overridden currently. Move SPFLAGS after OPTIONS and set this at the end. This lets you override any heuristics as coccinelle treats conflicts by only listening to the last option that makes sense.

v3: this patch was added in the v3 series
v4: Update Documentation/coccinelle.txt explaining how
SPFLAGS works as well.

---
 Documentation/coccinelle.txt | 3 ++-
 scripts/coccicheck           | 5 ++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

index 7f773d51fdd9..bb9632c20cfb 100644
@@ -146,7 +146,8 @@ MODE variable explained above.
 ~~~~~~~~~~~~~~~~~~
 
 Additional flags can be passed to spatch through the SPFLAGS
-variable.
+variable. This works as Coccinelle respects the last flags
+given to it when options are in conflict.
 
     make SPFLAGS=--use-glimpse coccicheck
     make SPFLAGS=--use-idutils coccicheck

index f137b04dfdd3..5319fae910b4 100755
@@ -30,7 +30,7 @@ else
 	NPROC="$J"
 fi
 
-FLAGS="--very-quiet $SPFLAGS"
+FLAGS="--very-quiet"
 
 # spatch only allows include directories with the syntax "-I include"
 # while gcc also allows "-Iinclude" and "-include include"

@@ -106,6 +106,9 @@ kill_running() {
 	done
 }
 
+# You can override heuristics with SPFLAGS, these must always go last
+OPTIONS="$OPTIONS $SPFLAGS"
+
 coccinelle () {
     COCCI="$1"
 

2.8.4

Coccinelle has had parmap support since 1.0.2, this means it supports --jobs, enabling built-in multithreaded functionality, instead of needing one to script it out. Just look for --jobs in the help output to determine if this is supported and use it only if your number of processors detected is > 1.

If parmap is enabled also enable the load balancing to be dynamic, so that if a thread finishes early we keep feeding it.

stderr is currently sent to /dev/null, addressing a way to capture that will be addressed next.

If --jobs is not supported we fallback to the old mechanism. We expect to deprecate the old mechanism as soon as we can get confirmation all users are ready.

While at it propagate back into the shell script any coccinelle error code. When used in serialized mode where all cocci files are run this also stops processing if an error has occured. This lets us handle some errors in coccinelle cocci files and if they bail out we should inspect the errors. This will be more useful later to help annotate coccinelle version dependency requirements. This will let you run only SmPL files that your system supports.

Extend Documentation/coccinelle.txt as well.

As a small example, prior to this change, on an 8-core system:

Before:

$ export COCCI=scripts/coccinelle/free/kfree.cocci
$ time make coccicheck MODE=report
...

real    29m14.912s
user    103m1.796s
sys     0m4.464s

After:

real    16m22.435s
user    128m30.060s
sys     0m2.712s

v4:

o expand Documentation/coccinelle.txt to reflect parmap support info
o update commit log to reflect what we actually do now with stderr
o split out DEBUG_FILE use into another patch
o detect number of CPUs and if its 1 then skip parmap support, note that if you still support parmap, but have 1 CPU you will also go through the new branches, so the old complex multithreaded process is skipped as well.

v3:

o move USE_JOBS to avoid being overriden

v2:

o redirect coccinelle stderr to /dev/null by default and only if DEBUG_FILE is used do we pass it to a file
o fix typo of paramap/parmap

---
 Documentation/coccinelle.txt | 15 +++++++++++++++
 scripts/coccicheck           | 35 ++++++++++++++++++++++++++++++++---
 2 files changed, 47 insertions(+), 3 deletions(-)

index bb9632c20cfb..64daaf18874b 100644
@@ -94,11 +94,26 @@ To enable verbose messages set the V= variable, for example:
 
    make coccicheck MODE=report V=1
 
+ Coccinelle parallelization
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 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:
 
    make coccicheck MODE=report J=4
 
+As of Coccinelle 1.0.2 Coccinelle uses Ocaml parmap for parallelization,
+if support for this is detected you will benefit from parmap parallelization.
+
+When parmap is enabled coccicheck will enable dynamic load balancing by using
+'--chunksize 1' argument, this ensures we keep feeding threads with work
+one by one, so that we avoid the situation where most work gets done by only
+a few threads. With dynamic load balancing, if a thread finishes early we keep
+feeding it more work.
+
+When parmap is enabled, if an error occurs in Coccinelle, this error
+value is propagated back, the return value of the 'make coccicheck'
+captures this return value.
 
  Using Coccinelle with a single semantic patch
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

index 5319fae910b4..4b65a0fd50a1 100755
@@ -12,8 +12,8 @@ if [ ! -x "$SPATCH" ]; then
     exit 1
 fi
 
-trap kill_running SIGTERM SIGINT
-declare -a SPATCH_PID
+USE_JOBS="no"
+$SPATCH --help | grep "\-\-jobs" > /dev/null && USE_JOBS="yes"
 
 # The verbosity may be set by the environmental parameter V=
 # as for example with 'make V=1 coccicheck'

@@ -56,6 +56,16 @@ if [ "$KBUILD_EXTMOD" != "" ] ; then
     OPTIONS="--patch $srctree $OPTIONS"
 fi
 
+# You can override by using SPFLAGS
+if [ "$USE_JOBS" = "no" ]; then
+	trap kill_running SIGTERM SIGINT
+	declare -a SPATCH_PID
+elif [ "$NPROC" != "1" ]; then
+	# Using 0 should work as well, refer to _SC_NPROCESSORS_ONLN use on
+	# https://github.com/rdicosmo/parmap/blob/master/setcore_stubs.c
+	OPTIONS="$OPTIONS --jobs $NPROC --chunksize 1"
+fi
+
 if [ "$MODE" = "" ] ; then
     if [ "$ONLINE" = "0" ] ; then
 	echo 'You have not explicitly specified the mode to use. Using default "report" mode.'

@@ -82,7 +92,18 @@ if [ "$ONLINE" = "0" ] ; then
     echo ''
 fi
 
-run_cmd() {
+run_cmd_parmap() {
+	if [ $VERBOSE -ne 0 ] ; then
+		echo "Running ($NPROC in parallel): $@"
+	fi
+	$@ 2>/dev/null
+	if [[ $? -ne 0 ]]; then
+		echo "coccicheck failed"
+		exit $?
+	fi
+}
+
+run_cmd_old() {
 	local i
 	if [ $VERBOSE -ne 0 ] ; then
 		echo "Running ($NPROC in parallel): $@"

@@ -97,6 +118,14 @@ run_cmd() {
 	wait
 }
 
+run_cmd() {
+	if [ "$USE_JOBS" = "yes" ]; then
+		run_cmd_parmap $@
+	else
+		run_cmd_old $@
+	fi
+}
+
 kill_running() {
 	for i in $(seq 0 $(( NPROC - 1 )) ); do
 		if [ $VERBOSE -eq 2 ] ; then

2.8.4

Enable to capture stderr via a DEBUG_FILE variable passed to coccicheck. You can now do:

$ rm -f cocci.err
$ export COCCI=scripts/coccinelle/free/kfree.cocci
$ make coccicheck MODE=report DEBUG_FILE=cocci.err
...
$ cat cocci.err

This will be come more useful once we add support to use more things which would go into stderr, such as profiling. That will be done separately in another commit.

Expand Documentation/coccinelle.txt with details.

---
 Documentation/coccinelle.txt | 20 ++++++++++++++++++++
 scripts/coccicheck           | 10 +++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

index 64daaf18874b..2516c5ef1691 100644
@@ -157,6 +157,26 @@ semantic patch as shown in the previous section.
 The "report" mode is the default. You can select another one with the
 MODE variable explained above.
 
+ Debugging Coccinelle SmPL patches
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Using coccicheck is best as it provides in the spatch command line
+include options matching the options used when we compile the kernel.
+You can learn what these options are by using V=1, you could then
+manually run Coccinelle with debug options added.
+
+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:
+
+    rm -f cocci.err
+    make coccicheck COCCI=scripts/coccinelle/free/kfree.cocci MODE=report DEBUG_FILE=cocci.err
+    cat cocci.err
+
+DEBUG_FILE support is only supported when using coccinelle >= 1.2.
+
  Additional flags
 ~~~~~~~~~~~~~~~~~~
 

index 4b65a0fd50a1..3f0bb3f0fddc 100755
@@ -96,7 +96,15 @@ run_cmd_parmap() {
 	if [ $VERBOSE -ne 0 ] ; then
 		echo "Running ($NPROC in parallel): $@"
 	fi
-	$@ 2>/dev/null
+	if [ "$DEBUG_FILE" != "/dev/null" -a "$DEBUG_FILE" != "" ]; then
+		if [ -f $DEBUG_FILE ]; then
+			echo "Debug file $DEBUG_FILE exists, bailing"
+			exit
+		fi
+	else
+		DEBUG_FILE="/dev/null"
+	fi
+	$@ 2>$DEBUG_FILE
 	if [[ $? -ne 0 ]]; then
 		echo "coccicheck failed"
 		exit $?

2.8.4

When debugging (using --profile or --show-trying) you want to avoid supressing output, use --quiet instead. While at it, extend documentation for SPFLAGS use.

For instance one can use:

$ export COCCI=scripts/coccinelle/misc/irqf_oneshot.cocci
$ make coccicheck DEBUG_FILE="poo.err" MODE=report SPFLAGS="--profile --show-trying" M=./drivers/mfd/arizona-irq.c

Expand Documentation/coccinelle.txt as well.

v4: expand Documentation/coccinelle.txt
v3: rebased, resolve conflicts, expand Documentation/coccinelle.txt
v2: use egrep instead of the *"=--option"* check, this doesn't work for
disjunctions.

---
 Documentation/coccinelle.txt | 12 ++++++++++++
 scripts/coccicheck           | 21 +++++++++++++++++++++
 2 files changed, 33 insertions(+)

index 2516c5ef1691..66e822f8caee 100644
@@ -175,6 +175,18 @@ instance:
     make coccicheck COCCI=scripts/coccinelle/free/kfree.cocci MODE=report DEBUG_FILE=cocci.err
     cat cocci.err
 
+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:
+
+    rm -f err.log
+    export COCCI=scripts/coccinelle/misc/irqf_oneshot.cocci
+    make coccicheck DEBUG_FILE="err.log" MODE=report SPFLAGS="--profile --show-trying" M=./drivers/mfd/arizona-irq.c
+
+err.log will now have the profiling information, while stdout will
+provide some progress information as Coccinelle moves forward with
+work.
+
 DEBUG_FILE support is only supported when using coccinelle >= 1.2.
 
  Additional flags

index 3f0bb3f0fddc..081ba5bff79c 100755
@@ -32,6 +32,27 @@ fi
 
 FLAGS="--very-quiet"
 
+# You can use SPFLAGS to append extra arguments to coccicheck or override any
+# heuristics done in this file as Coccinelle accepts the last options when
+# options conflict.
+#
+# A good example for use of SPFLAGS is if you want to debug your cocci script,
+# you can for instance use the following:
+#
+# $ export COCCI=scripts/coccinelle/misc/irqf_oneshot.cocci
+# $ make coccicheck MODE=report DEBUG_FILE="all.err" SPFLAGS="--profile --show-trying" M=./drivers/mfd/arizona-irq.c
+#
+# "--show-trying" should show you what rule is being processed as it goes to
+# stdout, you do not need a debug file for that. The profile output will be
+# be sent to stdout, if you provide a DEBUG_FILE the profiling data can be
+# inspected there.
+#
+# --profile will not output if --very-quiet is used, so avoid it.
+echo $SPFLAGS | egrep -e "--profile|--show-trying" 2>&1 > /dev/null
+if [ $? -eq 0 ]; then
+	FLAGS="--quiet"
+fi
+
 # spatch only allows include directories with the syntax "-I include"
 # while gcc also allows "-Iinclude" and "-include include"
 COCCIINCLUDE=${LINUXINCLUDE//-I/-I }

2.8.4

Coccinelle supports reading .cocciconfig, 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

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'.

'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:

if [ "$KBUILD_EXTMOD" = "" ] ; then
OPTIONS="--dir $srctree $COCCIINCLUDE"
else
OPTIONS="--dir $KBUILD_EXTMOD $COCCIINCLUDE"
fi

KBUILD_EXTMOD is set when an explicit target with M= is used. For both cases the spatch --dir argument is used, as such third rule applies when whether M= is used or not, and when M= is used the target directory can have its own .cocciconfig file. When M= is not passed as an argument to coccicheck the target directory is the same as the directory from where spatch was called.

If not using the kernel's coccicheck target, keep the above precedence order logic of .cocciconfig reading. If using the kernel's coccicheck target, 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 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:

  spatch --print-options-only

You can override with your own preferred index option by using SPFLAGS. Coccinelle supports both glimpse and idutils. Glimpse had historically provided the best performance, however recent benchmarks reveal idutils is performing just as well. Due to some recent fixes however you however will need at least coccinelle >= 1.0.6 if using idutils.

Coccinelle carries a script scripts/idutils_index.sh which creates the idutils database with as follows:

    mkid -i C --output .id-utils.index

If using just "--use-idutils" coccinelle expects your idutils database to be on the top level of the kernel as a file named ".id-utils.index". If you do not use this you can symlink your database file to it, or you can specify the database file following the "--use-idutils" argument. Examples:

make SPFLAGS=--use-idutils coccicheck

This assumes you have $srctree/.id-utils.index, where $srctree is the top level of the kernel.

make SPFLAGS="--use-idutils /full-path/to/ID" coccicheck

Here you specify the full path of the idutils ID database. Using .cocciconfig is possible, however given the order of precedence followed by Coccinelle, and since the kernel now carries its own .cocciconfig, you will need to use SPFLAGS to use idutils if desired.

v4:

o Recommend upgrade for using idutils with coccinelle due to some recent fixes.

o Refer to using --print-options-only for testing what options are picked up by .cocciconfig reading.

o Expand commit log considerably explaining *why* .cocconfig from two precedence rules are used when using coccicheck, and how to properly override these if needed.

o Expand Documentation/coccinelle.txt

v3: Expand commit log a bit more

---
 .cocciconfig                 |  3 ++
 .gitignore                   |  1 +
 Documentation/coccinelle.txt | 70 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+)
 create mode 100644 .cocciconfig

new file mode 100644
index 000000000000..43967c6b2015
@@ -0,0 +1,3 @@
+[spatch]
+	options = --timeout 200
+	options = --use-gitgrep

index 2be25f771bd8..c2ed4ecb0acd 100644
@@ -67,6 +67,7 @@ Module.symvers
 #
 !.gitignore
 !.mailmap
+!.cocciconfig
 
 #
 # Generated include files

2.8.4

Enable Coccinelle SmPL patches to require a specific version of Coccinelle. In the event that the version does not match we just inform the user, if the user asked to go through all SmPL patches we just inform them of the need for a new version of coccinelle for the SmPL patch and continue on with the rest.

This uses the simple kernel scripts/ld-version.sh to create a weight on the version provided by spatch. The -dirty attribute is ignored if supplied, the benefit of scripts/ld-version.sh is it has a long history and well tested.

While at it, document the // Options stuff as well.

v4: Document // Options and // Requires as well on
Documentation/coccinelle.txt.

---
 Documentation/coccinelle.txt | 19 +++++++++++++++++++
 scripts/coccicheck           | 14 ++++++++++++++
 2 files changed, 33 insertions(+)

index b50ac7e126e8..1c26908ebc16 100644
@@ -277,6 +277,25 @@ 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 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:
+
+// Options: --no-includes --include-headers
+
+ 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:
+
+// Requires: 1.0.5
+
  Proposing new semantic patches
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

index 081ba5bff79c..f9293ab04a8b 100755
@@ -5,6 +5,7 @@
 # version 1.0.0-rc11.
 #
 
+DIR="$(dirname $(readlink -f $0))/.."
 SPATCH="`which ${SPATCH:=spatch}`"
 
 if [ ! -x "$SPATCH" ]; then

@@ -12,6 +13,9 @@ if [ ! -x "$SPATCH" ]; then
     exit 1
 fi
 
+SPATCH_VERSION=$($SPATCH --version | head -1 | awk '{print $3}')
+SPATCH_VERSION_NUM=$(echo $SPATCH_VERSION | ${DIR}/scripts/ld-version.sh)
+
 USE_JOBS="no"
 $SPATCH --help | grep "\-\-jobs" > /dev/null && USE_JOBS="yes"
 

@@ -171,6 +175,16 @@ coccinelle () {
     COCCI="$1"
 
     OPT=`grep "Option" $COCCI | cut -d':' -f2`
+    REQ=`grep "Requires" $COCCI | cut -d':' -f2 | sed "s| ||"`
+    REQ_NUM=$(echo $REQ | ${DIR}/scripts/ld-version.sh)
+    if [ "$REQ_NUM" != "0" ] ; then
+	    if [ "$SPATCH_VERSION_NUM" -lt "$REQ_NUM" ] ; then
+		    echo "Skipping coccinele SmPL patch: $COCCI"
+		    echo "You have coccinelle:           $SPATCH_VERSION"
+		    echo "This SmPL patch requires:      $REQ"
+		    return
+	    fi
+    fi
 
 #   The option '--parse-cocci' can be used to syntactically check the SmPL files.
 #

2.8.4

Refer to the Documentation/coccinelle.txt and supplemental documentation on the wiki:

https://bottest.wiki.kernel.org/coccicheck

This page shall always refer to the linux-next iteration of scripts/coccicheck.

v4: only refer to the wiki as supplemental documentation, and also
update Documentation/coccinelle.txt.

---
 Documentation/coccinelle.txt | 9 +++++++++
 scripts/coccicheck           | 5 +++--
 2 files changed, 12 insertions(+), 2 deletions(-)

index 1c26908ebc16..01fb1dae3163 100644
@@ -38,6 +38,15 @@ as a regular user, and install it with
 
         sudo make install
 
+ Supplemental documentation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For supplemental documentation refer to the wiki:
+
+https://bottest.wiki.kernel.org/coccicheck
+
+The wiki documentation always refers to the linux-next version of the script.
+
  Using Coccinelle on the Linux kernel
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

index f9293ab04a8b..c92c1528a54d 100755
@@ -1,9 +1,10 @@
 #!/bin/bash
-
+# Linux kernel coccicheck
+#
+# Read Documentation/coccinelle.txt
 #
 # This script requires at least spatch
 # version 1.0.0-rc11.
-#
 
 DIR="$(dirname $(readlink -f $0))/.."
 SPATCH="`which ${SPATCH:=spatch}`"

2.8.4

Make use of the new Requires: tag to be able to specify coccinelle binary version requirements. The cocci file device_node_continue.cocci requires at least coccinelle 1.0.4.

---
 scripts/coccinelle/iterators/device_node_continue.cocci | 3 +++
 1 file changed, 3 insertions(+)

index 38ab744a4037..a36c16db171b 100644
@@ -5,8 +5,11 @@
 // Copyright: (C) 2015 Julia Lawall, Inria. GPLv2.
 // URL: http://coccinelle.lip6.fr/
 // Options: --no-includes --include-headers
+// Requires: 1.0.4
 // Keywords: for_each_child_of_node, etc.
 
+// This uses a conjunction, which requires at least coccinelle >= 1.0.4
+
 virtual patch
 virtual context
 virtual org

2.8.4

*Poke*

Luis

Applied to kbuild.git#misc.

Michal