genksyms: Fix enum consts from a reference affecting new values

Enumeration constants read from a symbol reference file can incorrectly
affect new enumeration constants parsed from an actual input file.

Example:

 $ cat test.c
 enum { E_A, E_B, E_MAX };
 struct bar { int mem[E_MAX]; };
 int foo(struct bar *a) {}
 __GENKSYMS_EXPORT_SYMBOL(foo);

 $ cat test.c | ./scripts/genksyms/genksyms -T test.0.symtypes
 #SYMVER foo 0x070d854d

 $ cat test.0.symtypes
 E#E_MAX 2
 s#bar struct bar { int mem [ E#E_MAX ] ; }
 foo int foo ( s#bar * )

 $ cat test.c | ./scripts/genksyms/genksyms -T test.1.symtypes -r test.0.symtypes
 <stdin>:4: warning: foo: modversion changed because of changes in enum constant E_MAX
 #SYMVER foo 0x9c9dfd81

 $ cat test.1.symtypes
 E#E_MAX ( 2 ) + 3
 s#bar struct bar { int mem [ E#E_MAX ] ; }
 foo int foo ( s#bar * )

The __add_symbol() function includes logic to handle the incrementation of
enumeration values, but this code is also invoked when reading a reference
file. As a result, the variables last_enum_expr and enum_counter might be
incorrectly set after reading the reference file, which later affects
parsing of the actual input.

Fix the problem by splitting the logic for the incrementation of
enumeration values into a separate function process_enum() and call it from
__add_symbol() only when processing non-reference data.

Fixes: e37ddb8 ("genksyms: Track changes to enum constants")
Signed-off-by: Petr Pavlu <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

Author: petrpavlu

scripts/genksyms/genksyms.c

@@ -181,13 +181,9 @@ static int is_unknown_symbol(struct symbol *sym)
 			strcmp(defn->string, "{") == 0);
 }
 
-static struct symbol *__add_symbol(const char *name, enum symbol_type type,
-			    struct string_list *defn, int is_extern,
-			    int is_reference)
+static struct string_list *process_enum(const char *name, enum symbol_type type,
+					struct string_list *defn)
 {
-	unsigned long h;
-	struct symbol *sym;
-	enum symbol_status status = STATUS_UNCHANGED;
 	/* The parser adds symbols in the order their declaration completes,
 	 * so it is safe to store the value of the previous enum constant in
 	 * a static variable.
@@ -216,7 +212,7 @@ static struct symbol *__add_symbol(const char *name, enum symbol_type type,
 				defn = mk_node(buf);
 			}
 		}
-	} else if (type == SYM_ENUM) {
+	} else {
 		free_list(last_enum_expr, NULL);
 		last_enum_expr = NULL;
 		enum_counter = 0;
@@ -225,6 +221,23 @@ static struct symbol *__add_symbol(const char *name, enum symbol_type type,
 			return NULL;
 	}
 
+	return defn;
+}
+
+static struct symbol *__add_symbol(const char *name, enum symbol_type type,
+			    struct string_list *defn, int is_extern,
+			    int is_reference)
+{
+	unsigned long h;
+	struct symbol *sym;
+	enum symbol_status status = STATUS_UNCHANGED;
+
+	if ((type == SYM_ENUM_CONST || type == SYM_ENUM) && !is_reference) {
+		defn = process_enum(name, type, defn);
+		if (defn == NULL)
+			return NULL;
+	}
+
 	h = crc32(name);
 	hash_for_each_possible(symbol_hashtable, sym, hnode, h) {
 		if (map_to_ns(sym->type) != map_to_ns(type) ||