torture: Add kvm.sh --help and update help message

This commit adds a --help argument (along with its synonym -h) to display
the help text.  While in the area, this commit also updates the help text.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index 0a08463..fc15b52 100755 (executable)
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -56,17 +56,18 @@ usage () {
        echo "       --defconfig string"
        echo "       --dryrun sched|script"
        echo "       --duration minutes"
+       echo "       --help"
        echo "       --interactive"
        echo "       --jitter N [ maxsleep (us) [ maxspin (us) ] ]"
        echo "       --kconfig Kconfig-options"
        echo "       --kmake-arg kernel-make-arguments"
        echo "       --mac nn:nn:nn:nn:nn:nn"
-       echo "       --memory megabytes | nnnG"
+       echo "       --memory megabytes|nnnG"
        echo "       --no-initrd"
        echo "       --qemu-args qemu-arguments"
        echo "       --qemu-cmd qemu-system-..."
        echo "       --results absolute-pathname"
-       echo "       --torture rcu"
+       echo "       --torture lock|rcu|rcuperf|refscale|scf"
        echo "       --trust-make"
        exit 1
 }
@@ -127,6 +128,9 @@ do
                dur=$(($2*60))
                shift
                ;;
+       --help|-h)
+               usage
+               ;;
        --interactive)
                TORTURE_QEMU_INTERACTIVE=1; export TORTURE_QEMU_INTERACTIVE
                ;;