torture: Default --no-rcutasksflavors on arm64

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@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>

diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
index 53f61f278fd73915a2e4040a98d4eed3a7540525..584d57b48036da16b154025654737109d37fae07 100755 (executable)
--- 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