The following commit creates a pre-processor warning during the KVM
selftest build as it leads to a re-definition of macro is_signed_type().
commit fc92099902fb ("tools headers: Synchronize linux/bits.h with the kernel sources")
$ make -C tools/testing/selftests TARGETS="kvm" all >/dev/null
In file included from s390/ucontrol_test.c:11:
../kselftest_harness.h:754:9: warning: ‘is_signed_type’ redefined
754 | #define is_signed_type(var) (!!(((__typeof__(var))(-1)) < (__typeof__(var))1))
| ^~~~~~~~~~~~~~
In file included from ./linux/tools/testing/selftests/../../../tools/include/linux/bits.h:34,
from ./linux/tools/testing/selftests/../../../tools/include/linux/bitops.h:14,
from ./linux/tools/testing/selftests/../../../tools/include/linux/hashtable.h:13,
from include/kvm_util.h:11,
from include/s390/debug_print.h:15,
from s390/ucontrol_test.c:10:
./linux/tools/testing/selftests/../../../tools/include/linux/overflow.h:31:9: note: this is the location of the previous definition
31 | #define is_signed_type(type) (((type)(-1)) < (type)1)
| ^~~~~~~~~~~~~~
cc1: note: unrecognized command-line option ‘-Wno-gnu-variable-sized-type-not-at-end’ may have been intended to silence earlier diagnostics
A fix resolving this issue outside this kvm selftest would be preferred.
Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxx>
---
tools/testing/selftests/kvm/s390/ucontrol_test.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/testing/selftests/kvm/s390/ucontrol_test.c b/tools/testing/selftests/kvm/s390/ucontrol_test.c
index d265b34c54be..d1258c1568db 100644
--- a/tools/testing/selftests/kvm/s390/ucontrol_test.c
+++ b/tools/testing/selftests/kvm/s390/ucontrol_test.c
@@ -8,6 +8,16 @@
* Christoph Schlameuss <schlameuss@xxxxxxxxxxxxx>
*/
#include "debug_print.h"
+
+/*
+ * header debug_print.h leaves macro is_signed_type()
+ * behind which is defined in "linux/overflow.h"
+ * header "kselftest_harness.h" re-defines it.
+ */
+#ifdef is_signed_type
+#undef is_signed_type
+#endif
+
#include "kselftest_harness.h"
#include "kvm_util.h"
#include "processor.h"
--
2.50.1
