kbuild: genksyms fix for typeof handling

The tokenizer misses counting an open-parenthesis when parsing a
non-trivial typeof beginning with an open-parenthesis. This function
in include/linux/ceph/libceph.h

static type *lookup_##name(struct rb_root *root,
                           typeof(((type *)0)->keyfld) key)

When instantiated in net/ceph/mon_client.c, causes subsequent symbols
including an EXPORT_SYMBOL in that file to be lost.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.com>

1 files changed, 17 insertions, 18 deletions

diff --git a/scripts/genksyms/lex.l b/scripts/genksyms/lex.l
index e583565f2011..5235aa507ba5 100644
--- a/scripts/genksyms/lex.l
+++ b/scripts/genksyms/lex.l
@@ -289,6 +289,23 @@ repeat:
         }
       break;
 
+    case ST_TYPEOF_1:
+      if (token == IDENT)
+        {
+          if (is_reserved_word(yytext, yyleng)
+              || find_symbol(yytext, SYM_TYPEDEF, 1))
+            {
+              yyless(0);
+              unput('(');
+              lexstate = ST_NORMAL;
+              token = TYPEOF_KEYW;
+              break;
+            }
+          _APP("(", 1);
+        }
+        lexstate = ST_TYPEOF;
+        /* FALLTHRU */
+
     case ST_TYPEOF:
       switch (token)
         {
@@ -313,24 +330,6 @@ repeat:
         }
       break;
 
-    case ST_TYPEOF_1:
-      if (token == IDENT)
-        {
-          if (is_reserved_word(yytext, yyleng)
-              || find_symbol(yytext, SYM_TYPEDEF, 1))
-            {
-              yyless(0);
-              unput('(');
-              lexstate = ST_NORMAL;
-              token = TYPEOF_KEYW;
-              break;
-            }
-          _APP("(", 1);
-        }
-        APP;
-        lexstate = ST_TYPEOF;
-        goto repeat;
-
     case ST_BRACKET:
       APP;
       switch (token)