Comment # 3 on bug 1119895 from Jiri Slaby

(In reply to Jiri Slaby from comment #2)
> We can also try pinging upstream about this, so that autogenerated headers
> are not removed on make clean...

This should fix it. Let's see what upstream says.

--- linux-5.2-rc3-master.orig/arch/s390/tools/Makefile
+++ linux-5.2-rc3-master/arch/s390/tools/Makefile
@@ -7,6 +7,7 @@ kapi := arch/$(ARCH)/include/generated/a
 kapi-hdrs-y := $(kapi)/facility-defs.h $(kapi)/dis-defs.h

 targets += $(addprefix ../../../,$(kapi-hdrs-y))
+no-clean-files += $(targets)
 PHONY += kapi

 kapi:  $(kapi-hdrs-y)