genksyms: decouple ATTRIBUTE_PHRASE from type-qualifier

The __attribute__ keyword can appear in more contexts than 'const' or
'volatile'.

To avoid grammatical conflicts with future changes, ATTRIBUTE_PHRASE
should not be reduced into type_qualifier.

No functional changes are intended.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Nicolas Schier <n.schier@avm.de>

Author: masahir0y

scripts/genksyms/parse.y

@@ -216,6 +216,7 @@ decl_specifier:
 		}
 	| type_specifier	{ dont_want_type_specifier = true; $$ = $1; }
 	| type_qualifier
+	| ATTRIBUTE_PHRASE
 	;
 
 storage_class_specifier:
@@ -285,11 +286,13 @@ type_qualifier_seq_opt:
 
 type_qualifier_seq:
 	type_qualifier
+	| ATTRIBUTE_PHRASE
 	| type_qualifier_seq type_qualifier		{ $$ = $2; }
+	| type_qualifier_seq ATTRIBUTE_PHRASE		{ $$ = $2; }
 	;
 
 type_qualifier:
-	CONST_KEYW | VOLATILE_KEYW | ATTRIBUTE_PHRASE
+	CONST_KEYW | VOLATILE_KEYW
 	| RESTRICT_KEYW
 		{ /* restrict has no effect in prototypes so ignore it */
 		  remove_node($1);