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-rw-r--r--tools/testing/selftests/livepatch/functions.sh26
1 files changed, 20 insertions, 6 deletions
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
index edcfeace4655..79b0affd21fb 100644
--- a/tools/testing/selftests/livepatch/functions.sh
+++ b/tools/testing/selftests/livepatch/functions.sh
@@ -29,13 +29,27 @@ function die() {
exit 1
}
-# set_dynamic_debug() - setup kernel dynamic debug
-# TODO - push and pop this config?
+function push_dynamic_debug() {
+ DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
+ awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
+}
+
+function pop_dynamic_debug() {
+ if [[ -n "$DYNAMIC_DEBUG" ]]; then
+ echo -n "$DYNAMIC_DEBUG" > /sys/kernel/debug/dynamic_debug/control
+ fi
+}
+
+# set_dynamic_debug() - save the current dynamic debug config and tweak
+# it for the self-tests. Set a script exit trap
+# that restores the original config.
function set_dynamic_debug() {
- cat << EOF > /sys/kernel/debug/dynamic_debug/control
-file kernel/livepatch/* +p
-func klp_try_switch_task -p
-EOF
+ push_dynamic_debug
+ trap pop_dynamic_debug EXIT INT TERM HUP
+ cat <<-EOF > /sys/kernel/debug/dynamic_debug/control
+ file kernel/livepatch/* +p
+ func klp_try_switch_task -p
+ EOF
}
# loop_until(cmd) - loop a command until it is successful or $MAX_RETRIES,