scripts: add dummy report mode to add_namespace.cocci

When running `make coccicheck` in report mode using the
add_namespace.cocci file, it will fail for files that contain
MODULE_LICENSE. Those match the replacement precondition, but spatch
errors out as virtual.ns is not set.

In order to fix that, add the virtual rule nsdeps and only do search and
replace if that rule has been explicitly requested.

In order to make spatch happy in report mode, we also need a dummy rule,
as otherwise it errors out with "No rules apply". Using a script:python
rule appears unrelated and odd, but this is the shortest I could come up
with.

Adjust scripts/nsdeps accordingly to set the nsdeps rule when run trough
`make nsdeps`.

Suggested-by: Julia Lawall <julia.lawall@inria.fr>
Fixes: c7c4e29fb5a4 ("scripts: add_namespace: Fix coccicheck failed")
Cc: YueHaibing <yuehaibing@huawei.com>
Cc: jeyu@kernel.org
Cc: cocci@systeme.lip6.fr
Cc: stable@vger.kernel.org
Signed-off-by: Matthias Maennich <maennich@google.com>
Reported-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Julia Lawall <julia.lawall@inria.fr>
Link: https://lore.kernel.org/r/20200604164145.173925-1-maennich@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/scripts/coccinelle/misc/add_namespace.cocci b/scripts/coccinelle/misc/add_namespace.cocci
index 99e93a6c2e240c3ba0a95ad5f214c236c97de470..cbf1614163cb81b840a4e0f7cbaec5626b5fb7e1 100644 (file)
--- a/scripts/coccinelle/misc/add_namespace.cocci
+++ b/scripts/coccinelle/misc/add_namespace.cocci
@@ -6,6 +6,7 @@
 /// add a missing namespace tag to a module source file.
 ///
 
+virtual nsdeps
 virtual report
 
 @has_ns_import@
@@ -16,10 +17,15 @@ MODULE_IMPORT_NS(ns);
 
 // Add missing imports, but only adjacent to a MODULE_LICENSE statement.
 // That ensures we are adding it only to the main module source file.
-@do_import depends on !has_ns_import@
+@do_import depends on !has_ns_import && nsdeps@
 declarer name MODULE_LICENSE;
 expression license;
 identifier virtual.ns;
 @@
 MODULE_LICENSE(license);
 + MODULE_IMPORT_NS(ns);
+
+// Dummy rule for report mode that would otherwise be empty and make spatch
+// fail ("No rules apply.")
+@script:python depends on report@
+@@

diff --git a/scripts/nsdeps b/scripts/nsdeps
index 03a8e7cbe6c77731ddd77d4fa815c6eddf1490c2..dab4c1a0e27dd0517faa736f17424c356b153ddf 100644 (file)
--- a/scripts/nsdeps
+++ b/scripts/nsdeps
@@ -29,7 +29,7 @@ fi
 
 generate_deps_for_ns() {
        $SPATCH --very-quiet --in-place --sp-file \
-               $srctree/scripts/coccinelle/misc/add_namespace.cocci -D ns=$1 $2
+               $srctree/scripts/coccinelle/misc/add_namespace.cocci -D nsdeps -D ns=$1 $2
 }
 
 generate_deps() {