[Cocci] [PATCH v2 4/4] coccinelle: api: add selfcheck for memdup_user rule

[Denis Efremov <efremov@linux.com>]

Check that the rule matches vmemdup_user implementation.
memdup_user is out of scope because we are not matching
kmalloc_track_caller() function.

Signed-off-by: Denis Efremov <efremov@linux.com>
---
 scripts/coccinelle/api/memdup_user.cocci | 46 ++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/scripts/coccinelle/api/memdup_user.cocci b/scripts/coccinelle/api/memdup_user.cocci
index 8621bd98be1e..78fded83b197 100644
--- a/scripts/coccinelle/api/memdup_user.cocci
+++ b/scripts/coccinelle/api/memdup_user.cocci
@@ -14,13 +14,24 @@ virtual patch
 virtual context
 virtual org
 virtual report
+virtual selfcheck
 
 @initialize:python@
 @@
-filter = frozenset(['memdup_user', 'vmemdup_user'])
+
+definitions = {
+    'memdup_user': 'mm/util.c',
+    'vmemdup_user': 'mm/util.c',
+}
+
+filter = frozenset(definitions.keys())
+coccinelle.filtered = set()
+coccinelle.checked_files = set()
 
 def relevant(p):
-    return not (filter & {el.current_element for el in p})
+    found = filter & {el.current_element for el in p}
+    coccinelle.filtered |= found
+    return not found
 
 @depends on patch@
 expression from,to,size;
@@ -117,3 +128,34 @@ p << rv.p;
 @@
 
 coccilib.report.print_report(p[0], "WARNING opportunity for vmemdup_user")
+
+@script:python depends on selfcheck@
+@@
+coccinelle.checked_files |= set(definitions.values()) & set(cocci.files())
+
+@finalize:python depends on selfcheck@
+filtered << merge.filtered;
+checked_files << merge.checked_files;
+@@
+
+# Don't check memdup_user because the pattern is not capturing
+# kmalloc_track_caller() calls
+del definitions['memdup_user']
+
+# mapping between checked files and filtered definitions
+found_defns = {}
+for files, funcs in zip(checked_files, filtered):
+   for file in files:
+      found_defns[file] = funcs
+
+# reverse mapping of definitions
+expected_defns = {v : set() for v in definitions.values()}
+for k, v in definitions.items():
+    expected_defns[v] |= {k}
+
+for efile, efuncs in expected_defns.items():
+    if efile in found_defns:
+        not_found = efuncs - found_defns[efile]
+        if not_found:
+            print('SELF-CHECK: the pattern no longer matches ' \
+		  'definitions {} in file {}'.format(not_found, efile))
-- 
2.26.2

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