rcutorture: Use vmlinux as the fallback kernel image

The vmlinux image is available for all the architectures, and suitable
for running a KVM guest by QEMU, besides, we used to copy the vmlinux
to $resdir anyway. Therefore it makes sense to use it as the fallback
kernel image for rcutorture KVM tests.

This patch makes identify_boot_image() return vmlinux if
${TORTURE_BOOT_IMAGE} is not set on non-x86 architectures, also fixes
several places that hard-code "bzImage" as $KERNEL.

This also fixes a problem that PPC doesn't have a bzImage file as build
results.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

2 files changed, 7 insertions, 8 deletions

diff --git a/tools/testing/selftests/rcutorture/bin/functions.sh b/tools/testing/selftests/rcutorture/bin/functions.sh
index b325470c01b3..616180153208 100644
--- a/tools/testing/selftests/rcutorture/bin/functions.sh
+++ b/tools/testing/selftests/rcutorture/bin/functions.sh
@@ -99,8 +99,9 @@ configfrag_hotplug_cpu () {
 # identify_boot_image qemu-cmd
 #
 # Returns the relative path to the kernel build image.  This will be
-# arch/<arch>/boot/bzImage unless overridden with the TORTURE_BOOT_IMAGE
-# environment variable.
+# arch/<arch>/boot/bzImage or vmlinux if bzImage is not a target for the
+# architecture, unless overridden with the TORTURE_BOOT_IMAGE environment
+# variable.
 identify_boot_image () {
         if test -n "$TORTURE_BOOT_IMAGE"
         then
@@ -110,11 +111,8 @@ identify_boot_image () {
                 qemu-system-x86_64|qemu-system-i386)
                         echo arch/x86/boot/bzImage
                         ;;
-                qemu-system-ppc64)
-                        echo arch/powerpc/boot/bzImage
-                        ;;
                 *)
-                        echo ""
+                        echo vmlinux
                         ;;
                 esac
         fi
diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
index 9b17c5252a2e..8dc5e4639fb4 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
@@ -96,7 +96,8 @@ if test "$base_resdir" != "$resdir" -a -f $base_resdir/bzImage -a -f $base_resdi
 then
         # Rerunning previous test, so use that test's kernel.
         QEMU="`identify_qemu $base_resdir/vmlinux`"
-        KERNEL=$base_resdir/bzImage
+        BOOT_IMAGE="`identify_boot_image $QEMU`"
+        KERNEL=$base_resdir/${BOOT_IMAGE##*/} # use the last component of ${BOOT_IMAGE}
         ln -s $base_resdir/Make*.out $resdir  # for kvm-recheck.sh
         ln -s $base_resdir/.config $resdir  # for kvm-recheck.sh
 elif kvm-build.sh $config_template $builddir $T
@@ -110,7 +111,7 @@ then
         if test -n "$BOOT_IMAGE"
         then
                 cp $builddir/$BOOT_IMAGE $resdir
-                KERNEL=$resdir/bzImage
+                KERNEL=$resdir/${BOOT_IMAGE##*/}
         else
                 echo No identifiable boot image, not running KVM, see $resdir.
                 echo Do the torture scripts know about your architecture?