modpost: fix unwanted VMLINUX_SYMBOL_STR expansion

Commit a4b6a77 ("module: fix symbol
versioning with symbol prefixes") broke the MODVERSIONS loading of any
module using memcmp (e.g. ipv6) on x86_32, as it's defined to
__builtin_memcmp which is expanded by VMLINUX_SYMBOL_STR. Use
__VMLINUX_SYMBOL_STR instead which doesn't expand the argument.

Reported-by: Tetsuo Handa <[email protected]>
Reported-by: Andy Shevchenko <[email protected]>
Signed-off-by: James Hogan <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Tested-by: Tetsuo Handa <[email protected]>
Tested-by: Andy Shevchenko <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
Cc: <[email protected]> # 3.9

scripts/mod/modpost.c

@@ -1957,7 +1957,7 @@ static int add_versions(struct buffer *b, struct module *mod)
 				s->name, mod->name);
 			continue;
 		}
-		buf_printf(b, "\t{ %#8x, VMLINUX_SYMBOL_STR(%s) },\n",
+		buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
 			   s->crc, s->name);
 	}