kernel-doc: fix declaration type determination

Make declaration type determination more robust.

When scripts/kernel-doc is deciding if some kernel-doc notation
contains an enum, a struct, a union, a typedef, or a function,
it does a pattern match on the beginning of the string, looking
for a match with one of "struct", "union", "enum", or "typedef",
and otherwise defaults to a function declaration type.
However, if a function or a function-like macro has a name that
begins with "struct" (e.g., struct_size()), then kernel-doc
incorrectly decides that this is a struct declaration.

Fix this by looking for the declaration type keywords having an
ending word boundary (\b), so that "struct_size" will not match
a struct declaration.

I compared lots of html before/after output from core-api, driver-api,
and networking.  There were no differences in any of the files that
I checked.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 8f0f508..ffbe901 100755 (executable)
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1904,13 +1904,13 @@ sub process_name($$) {
            ++$warnings;
        }
 
-       if ($identifier =~ m/^struct/) {
+       if ($identifier =~ m/^struct\b/) {
            $decl_type = 'struct';
-       } elsif ($identifier =~ m/^union/) {
+       } elsif ($identifier =~ m/^union\b/) {
            $decl_type = 'union';
-       } elsif ($identifier =~ m/^enum/) {
+       } elsif ($identifier =~ m/^enum\b/) {
            $decl_type = 'enum';
-       } elsif ($identifier =~ m/^typedef/) {
+       } elsif ($identifier =~ m/^typedef\b/) {
            $decl_type = 'typedef';
        } else {
            $decl_type = 'function';