linux-kernel - [PATCH rcu 04/13] torture: Default --no-rcutasksflavors on arm64

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Message-Id: <20250709104414.15618-5-neeraj.upadhyay@kernel.org>
Date: Wed,  9 Jul 2025 16:14:05 +0530
From: neeraj.upadhyay@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	paulmck@...nel.org,
	joelagnelf@...dia.com,
	frederic@...nel.org,
	boqun.feng@...il.com,
	urezki@...il.com,
	rostedt@...dmis.org,
	mathieu.desnoyers@...icios.com,
	jiangshanlai@...il.com,
	qiang.zhang1211@...il.com,
	neeraj.iitr10@...il.com,
	neeraj.upadhyay@....com,
	"Neeraj Upadhyay (AMD)" <neeraj.upadhyay@...nel.org>
Subject: [PATCH rcu 04/13] torture: Default --no-rcutasksflavors on arm64

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

Because arm64 does not support CONFIG_SMP=n kernels, --do-rcutasksflavors
gets Kconfig errors when running the TINY01 rcutorture scenario.
This commit therefore makes --no-rcutasksflavors be the default on
arm64.  Once kvm.sh automatically deselects CONFIG_SMP=n rcutorture
scenarios on arm64, the two lines marked "FIXME" can be changed back
from "${ifnotaarch64}" to "yes".

Note that arm64 users can still specify --do-rcutasksflavors in order
to override this default.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@...nel.org>
---
 tools/testing/selftests/rcutorture/bin/torture.sh | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
index 53f61f278fd7..584d57b48036 100755
--- a/tools/testing/selftests/rcutorture/bin/torture.sh
+++ b/tools/testing/selftests/rcutorture/bin/torture.sh
@@ -30,6 +30,15 @@ then
 	VERBOSE_BATCH_CPUS=0
 fi
 
+# Machine architecture?  ("uname -p" is said to be less portable.)1
+thisarch="`uname -m`"
+if test "${thisarch}" = aarch64
+then
+	ifnotaarch64=no
+else
+	ifnotaarch64=yes
+fi
+
 # Configurations/scenarios.
 configs_rcutorture=
 configs_locktorture=
@@ -57,7 +66,7 @@ do_kasan=yes
 do_kcsan=no
 do_clocksourcewd=yes
 do_rt=yes
-do_rcutasksflavors=yes
+do_rcutasksflavors="${ifnotaarch64}" # FIXME: Back to "yes" when SMP=n auto-avoided
 do_srcu_lockdep=yes
 do_rcu_rust=no
 
@@ -124,7 +133,7 @@ do
 		;;
 	--do-all|--doall)
 		do_allmodconfig=yes
-		do_rcutasksflavor=yes
+		do_rcutasksflavors="${ifnotaarch64}" # FIXME: Back to "yes" when SMP=n auto-avoided
 		do_rcutorture=yes
 		do_locktorture=yes
 		do_scftorture=yes
-- 
2.40.1