kernel-doc: fix processing nested structs with attributes

The current regular expression for strip attributes of structs (and
for nested ones as well) also removes all whitespaces that may
surround the attribute. After that, the code will split structs and
iterate for each symbol separated by comma at the end of struct
definition (e.g. "} alias1, alias2;"). However, if the nested struct
does not have any alias and has an attribute, it will result in a
empty string at the closing bracket (e.g "};"). This will make the
split return nothing and $newmember will keep uninitialized. Fix
that, by ensuring that the attribute substitution will leave at least
one whitespace.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 81dc91760b23770c0ad47d81de54ca63a6a3f14f..baa2be7e5284f6428379f89fb924d8f67c5ae616 100755 (executable)
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1073,10 +1073,10 @@ sub dump_struct($$) {
        # strip comments:
        $members =~ s/\/\*.*?\*\///gos;
        # strip attributes
-       $members =~ s/\s*__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)//gi;
-       $members =~ s/\s*__aligned\s*\([^;]*\)//gos;
-       $members =~ s/\s*__packed\s*//gos;
-       $members =~ s/\s*CRYPTO_MINALIGN_ATTR//gos;
+       $members =~ s/\s*__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)/ /gi;
+       $members =~ s/\s*__aligned\s*\([^;]*\)/ /gos;
+       $members =~ s/\s*__packed\s*/ /gos;
+       $members =~ s/\s*CRYPTO_MINALIGN_ATTR/ /gos;
        # replace DECLARE_BITMAP
        $members =~ s/DECLARE_BITMAP\s*\(([^,)]+),\s*([^,)]+)\)/unsigned long $1\[BITS_TO_LONGS($2)\]/gos;
        # replace DECLARE_HASHTABLE