[PATCH] rcutorture: Ignore KBUILD_OUTPUT in kvm.sh

[Puranjay Mohan <puranjay@kernel.org>]

kvm.sh builds the kernel in the source tree, and kvm-build.sh and
configinit.sh expect .config and the build products to land there.
With KBUILD_OUTPUT set in the environment, make instead writes them to
that directory and fails with "The source tree is not clean" or, worse,
clobbers an unrelated build.  Unset it so kvm.sh works from such shells.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
---
 tools/testing/selftests/rcutorture/bin/kvm.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index 86dd5c131d226..ee8266156254b 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -22,6 +22,10 @@ cd `dirname $scriptname`/../../../../../
 # This script knows only English.
 LANG=en_US.UTF-8; export LANG
 
+# The kernel is built in-tree below, so an out-of-tree KBUILD_OUTPUT in the
+# environment would send .config and the build products somewhere else.
+unset KBUILD_OUTPUT
+
 dur=$((30*60))
 dryrun=""
 RCUTORTURE="`pwd`/tools/testing/selftests/rcutorture"; export RCUTORTURE
-- 
2.53.0-Meta