genksyms: Handle string literals with spaces in reference files

commit a78f70e8 upstream.

The reference files use spaces to separate tokens, however, we must
preserve spaces inside string literals. Currently the only case in the
tree is struct edac_raw_error_desc in <linux/edac.h>:

$ KBUILD_SYMTYPES=1 make -s drivers/edac/amd64_edac.symtypes
$ mv drivers/edac/amd64_edac.{symtypes,symref}
$ KBUILD_SYMTYPES=1 make -s drivers/edac/amd64_edac.symtypes
drivers/edac/amd64_edac.c:527: warning: amd64_get_dram_hole_info: modversion changed because of changes in struct edac_raw_error_desc
Signed-off-by: Michal Marek <mmarek@suse.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

scripts/genksyms/genksyms.c

@@ -423,13 +423,15 @@ static struct string_list *read_node(FILE *f)
 	struct string_list node = {
 		.string = buffer,
 		.tag = SYM_NORMAL };
-	int c;
+	int c, in_string = 0;
 
 	while ((c = fgetc(f)) != EOF) {
-		if (c == ' ') {
+		if (!in_string && c == ' ') {
 			if (node.string == buffer)
 				continue;
 			break;
+		} else if (c == '"') {
+			in_string = !in_string;
 		} else if (c == '\n') {
 			if (node.string == buffer)
 				return NULL;