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 <roland@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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)
#endif
+#endif
#ifndef __ALIGN
#define __ALIGN .align 4,0x90