Hi Thomas,
On Fri, 12 Sept 2025 at 12:00, Thomas Weißschuh linux@weissschuh.net wrote:
Hi Naresh,
On 2025-09-12 00:48:47+0530, Naresh Kamboju wrote:
The following build warnings / errors noticed on arm64 defconfig with clang-20 and gcc-13 toolchains on the Linux next-20250909 till next-20250911 tag while building selftests/arm64.
Regression Analysis:
- New regression? Yes
- Reproducibility? yes
First seen on next-20250909 Good: next-20250908 Bad: next-20250909 till next-20250911
Test regression: next-20250909: selftests/arm64/gcs/basic-gcs.c:390:30: error: use of undeclared identifier 'HWCAP_GCS'
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
## Build log selftests/arm64/gcs/basic-gcs.c:390:30: error: use of undeclared identifier 'HWCAP_GCS' 390 | if (!(getauxval(AT_HWCAP) & HWCAP_GCS)) | ^ 1 error generated.
The suspected commit pointing to, kselftest/arm64/gcs: Use nolibc's getauxval() a985fe638344492727528e52416211dda1c391d5
That suspicion looks correct. I am wondering a bit how this works for the other selftests which use this symbol.
Can you give this one a try:
I have applied this patch and tested and reported build regressions got fixed.
Tested-by: Linux Kernel Functional Testing lkft@linaro.org
diff --git a/tools/testing/selftests/arm64/gcs/gcs-util.h b/tools/testing/selftests/arm64/gcs/gcs-util.h index c99a6b39ac14..816b497634d6 100644 --- a/tools/testing/selftests/arm64/gcs/gcs-util.h +++ b/tools/testing/selftests/arm64/gcs/gcs-util.h @@ -26,6 +26,10 @@ struct user_gcs { }; #endif
+#ifndef HWCAP_GCS +#define HWCAP_GCS (1UL << 32) +#endif
/* Shadow Stack/Guarded Control Stack interface */ #define PR_GET_SHADOW_STACK_STATUS 74 #define PR_SET_SHADOW_STACK_STATUS 75
-- Linaro LKFT