torture: Add --allcpus argument to the kvm.sh script

Leaving off the kvm.sh script's --cpus argument results in the script
testing the scenarios sequentially, which can be quite slow.  However,
having to specify the actual number of CPUs can be error-prone.
This commit therefore adds a --allcpus argument that causes kvm.sh to
use all available CPUs.

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 c279cf9..7dbce7a 100755 (executable)
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -73,6 +73,10 @@ usage () {
 while test $# -gt 0
 do
        case "$1" in
+       --allcpus)
+               cpus=$TORTURE_ALLOTED_CPUS
+               max_cpus=$TORTURE_ALLOTED_CPUS
+               ;;
        --bootargs|--bootarg)
                checkarg --bootargs "(list of kernel boot arguments)" "$#" "$2" '.*' '^--'
                TORTURE_BOOTARGS="$2"