diff options
| -rw-r--r-- | Documentation/coccinelle.txt | 20 | ||||
| -rwxr-xr-x | scripts/coccicheck | 10 |
2 files changed, 29 insertions, 1 deletions
diff --git a/Documentation/coccinelle.txt b/Documentation/coccinelle.txt index 64daaf18874b..2516c5ef1691 100644 --- a/Documentation/coccinelle.txt +++ b/Documentation/coccinelle.txt @@ -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 ~~~~~~~~~~~~~~~~~~ diff --git a/scripts/coccicheck b/scripts/coccicheck index 4b65a0fd50a1..3f0bb3f0fddc 100755 --- a/scripts/coccicheck +++ b/scripts/coccicheck @@ -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 $? |