linux-kernel - [PATCH] kselftest/arm4: Provide local defines for AT

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Message-Id: <20250715-arm64-selftest-bodge-hwcap3-v1-1-541b54bc43bb@kernel.org>
Date: Tue, 15 Jul 2025 22:11:41 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH] kselftest/arm4: Provide local defines for AT_HWCAP3

Some build environments for the selftests are not picking up the newly
added AT_HWCAP3 when using the libc headers, even with headers_install
(which we require already for the arm64 selftests).  As a quick fix add
local definitions of the constant to tools use it, while auxvec.h is
installed with some toolchains it needs some persuasion to get picked up.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/arm64/abi/hwcap.c       | 4 ++++
 tools/testing/selftests/arm64/mte/check_prctl.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c
index 35f521e5f41c..aa902408facd 100644
--- a/tools/testing/selftests/arm64/abi/hwcap.c
+++ b/tools/testing/selftests/arm64/abi/hwcap.c
@@ -21,6 +21,10 @@
 
 #define TESTS_PER_HWCAP 3
 
+#ifndef AT_HWCAP3
+#define AT_HWCAP3 29
+#endif
+
 /*
  * Function expected to generate exception when the feature is not
  * supported and return when it is supported. If the specific exception
diff --git a/tools/testing/selftests/arm64/mte/check_prctl.c b/tools/testing/selftests/arm64/mte/check_prctl.c
index 4c89e9538ca0..c36c4c49ff95 100644
--- a/tools/testing/selftests/arm64/mte/check_prctl.c
+++ b/tools/testing/selftests/arm64/mte/check_prctl.c
@@ -12,6 +12,10 @@
 
 #include "kselftest.h"
 
+#ifndef AT_HWCAP3
+#define AT_HWCAP3 29
+#endif
+
 static int set_tagged_addr_ctrl(int val)
 {
 	int ret;

---
base-commit: 86731a2a651e58953fc949573895f2fa6d456841
change-id: 20250710-arm64-selftest-bodge-hwcap3-b6ab30ab69cd

Best regards,
--  
Mark Brown <broonie@...nel.org>