[PATCH] kernel-doc: fix declaration type determination

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Tested-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
---
 scripts/kernel-doc |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- lnx-419-rc8.orig/scripts/kernel-doc
+++ lnx-419-rc8/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';