Fix "$(AS) -traditional" compile breakage caused by asmlinkage_protect

git commit 54a015104136974262afa4b8ddd943ea70dec8a2 ("asmlinkage_protect
replaces prevent_tail_call") causes this build failure on s390:

    AS      arch/s390/kernel/entry64.o
  In file included from arch/s390/kernel/entry64.S:14:
  include/linux/linkage.h:34: error: syntax error in macro parameter list
  make[1]: *** [arch/s390/kernel/entry64.o] Error 1
  make: *** [arch/s390/kernel] Error 2

and some other architectures.  The reason is that some architectures add
the "-traditional" flag to the invocation of $(AS), which disables
variadic macro argument support.

So just surround the new define with an #ifndef __ASSEMBLY__ to prevent
any side effects on asm code.

Cc: Roland McGrath <>
Cc: Martin Schwidefsky <>
Signed-off-by: Heiko Carstens <>
Signed-off-by: Linus Torvalds <>
diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index b163c5c..2119610 100644
--- a/include/linux/linkage.h
+++ b/include/linux/linkage.h
@@ -30,9 +30,12 @@
  * protection to work (ie no more work that the compiler might
  * end up needing stack temporaries for).
+/* Assembly files may be compiled with -traditional .. */
+#ifndef __ASSEMBLY__
 #ifndef asmlinkage_protect
 # define asmlinkage_protect(n, ret, args...)	do { } while (0)
 #ifndef __ALIGN
 #define __ALIGN		.align 4,0x90