path: root/tools/testing/selftests/livepatch
diff options
authorJoe Lawrence <joe.lawrence@redhat.com>2020-06-03 14:20:55 -0400
committerPetr Mladek <pmladek@suse.com>2020-06-08 10:36:10 +0200
commit547840bd5ae52a9d864abddcb91ea491a78d8199 (patch)
tree8b81cec6c1d30e4f21ff079cd1c71e6a6c67ff54 /tools/testing/selftests/livepatch
parentMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching (diff)
selftests/livepatch: simplify test-klp-callbacks busy target tests
The test-klp-callbacks script includes a few tests which rely on kernel task timings that may not always execute as expected under system load. These may generate out of sequence kernel log messages that result in test failure. Instead of using sleep timing windows to orchestrate these tests, add a block_transition module parameter to communicate the test purpose and utilize flush_queue() to serialize the test module's task output. Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20200603182058.109470-2-ycote@redhat.com
Diffstat (limited to 'tools/testing/selftests/livepatch')
1 files changed, 14 insertions, 15 deletions
diff --git a/tools/testing/selftests/livepatch/test-callbacks.sh b/tools/testing/selftests/livepatch/test-callbacks.sh
index a35289b13c9c..32b57ba07f4f 100755
--- a/tools/testing/selftests/livepatch/test-callbacks.sh
+++ b/tools/testing/selftests/livepatch/test-callbacks.sh
@@ -356,9 +356,7 @@ livepatch: '$MOD_LIVEPATCH': unpatching complete
echo -n "TEST: multiple target modules ... "
dmesg -C
-load_mod $MOD_TARGET_BUSY sleep_secs=0
-# give $MOD_TARGET_BUSY::busymod_work_func() a chance to run
-sleep 5
+load_mod $MOD_TARGET_BUSY block_transition=N
load_mod $MOD_TARGET
unload_mod $MOD_TARGET
@@ -366,9 +364,9 @@ disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET_BUSY
-check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=0
+check_result "% modprobe $MOD_TARGET_BUSY block_transition=N
-$MOD_TARGET_BUSY: busymod_work_func, sleeping 0 seconds ...
+$MOD_TARGET_BUSY: busymod_work_func enter
$MOD_TARGET_BUSY: busymod_work_func exit
% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
@@ -404,11 +402,10 @@ livepatch: '$MOD_LIVEPATCH': unpatching complete
# TEST: busy target module
# A similar test as the previous one, but force the "busy" kernel module
-# to do longer work.
+# to block the livepatch transition.
# The livepatching core will refuse to patch a task that is currently
# executing a to-be-patched function -- the consistency model stalls the
@@ -417,8 +414,7 @@ $MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
# function for a long time. Meanwhile, load and unload other target
# kernel modules while the livepatch transition is in progress.
-# - Load the "busy" kernel module, this time make it do 10 seconds worth
-# of work.
+# - Load the "busy" kernel module, this time make its work function loop
# - Meanwhile, the livepatch is loaded. Notice that the patch
# transition does not complete as the targeted "busy" module is
@@ -438,20 +434,23 @@ $MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
echo -n "TEST: busy target module ... "
dmesg -C
-load_mod $MOD_TARGET_BUSY sleep_secs=10
+load_mod $MOD_TARGET_BUSY block_transition=Y
load_lp_nowait $MOD_LIVEPATCH
-# Don't wait for transition, load $MOD_TARGET while the transition
-# is still stalled in $MOD_TARGET_BUSY::busymod_work_func()
-sleep 5
+# Wait until the livepatch reports in-transition state, i.e. that it's
+# stalled on $MOD_TARGET_BUSY::busymod_work_func()
+loop_until 'grep -q '^1$' /sys/kernel/livepatch/$MOD_LIVEPATCH/transition' ||
+ die "failed to stall transition"
load_mod $MOD_TARGET
unload_mod $MOD_TARGET
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
unload_mod $MOD_TARGET_BUSY
-check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=10
+check_result "% modprobe $MOD_TARGET_BUSY block_transition=Y
-$MOD_TARGET_BUSY: busymod_work_func, sleeping 10 seconds ...
+$MOD_TARGET_BUSY: busymod_work_func enter
% modprobe $MOD_LIVEPATCH
livepatch: enabling patch '$MOD_LIVEPATCH'
livepatch: '$MOD_LIVEPATCH': initializing patching transition