From: "Paul E. McKenney" <paulmck@kernel.org>

The arm64 architecture requires that KCSAN-enabled kernels be built with
the CONFIG_EXPERT=y Kconfig option.  This commit therefore causes the
torture.sh script to provide this option, but only for --kcsan runs on
arm64 systems.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: <kasan-dev@googlegroups.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
---
 tools/testing/selftests/rcutorture/bin/torture.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
index 25847042e30e..420c551b824b 100755
--- a/tools/testing/selftests/rcutorture/bin/torture.sh
+++ b/tools/testing/selftests/rcutorture/bin/torture.sh
@@ -313,6 +313,13 @@ then
 	do_scftorture=no
 fi
 
+# CONFIG_EXPERT=y is currently required for arm64 KCSAN runs.
+kcsan_expert=
+if test "${thisarch}" = aarch64
+then
+	kcsan_expert="CONFIG_EXPERT=y"
+fi
+
 touch $T/failures
 touch $T/successes
 
@@ -392,7 +399,7 @@ function torture_set {
 		then
 			chk_rdr_state="CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=y"
 		fi
-		torture_one "$@" --kconfig "CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y ${chk_rdr_state}" $kcsan_kmake_tag $cur_kcsan_kmake_args --kcsan
+		torture_one "$@" --kconfig "CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y ${kcsan_expert} ${chk_rdr_state}" $kcsan_kmake_tag $cur_kcsan_kmake_args --kcsan
 		mv $T/last-resdir $T/last-resdir-kcsan || :
 	fi
 }
-- 
2.40.1

On Wed, Jul 09, 2025 at 04:14:07PM +0530, neeraj.upadhyay@kernel.org wrote:
> From: "Paul E. McKenney" <paulmck@kernel.org>
> 
> The arm64 architecture requires that KCSAN-enabled kernels be built with
> the CONFIG_EXPERT=y Kconfig option.  This commit therefore causes the
> torture.sh script to provide this option, but only for --kcsan runs on
> arm64 systems.
> 
> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
> Cc: Marco Elver <elver@google.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: <kasan-dev@googlegroups.com>
> Cc: <linux-arm-kernel@lists.infradead.org>
> Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>
> ---
>  tools/testing/selftests/rcutorture/bin/torture.sh | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
> index 25847042e30e..420c551b824b 100755
> --- a/tools/testing/selftests/rcutorture/bin/torture.sh
> +++ b/tools/testing/selftests/rcutorture/bin/torture.sh
> @@ -313,6 +313,13 @@ then
>  	do_scftorture=no
>  fi
>  
> +# CONFIG_EXPERT=y is currently required for arm64 KCSAN runs.
> +kcsan_expert=
> +if test "${thisarch}" = aarch64
> +then
> +	kcsan_expert="CONFIG_EXPERT=y"
> +fi

Acked-by: Will Deacon <will@kernel.org>

Will