From: Joe Lawrence <joe.lawrence@redhat.com>
To: live-patching@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: [PATCH] selftests/livepatch: push and pop dynamic debug config
Date: Thu, 18 Jul 2019 16:29:48 -0400 [thread overview]
Message-ID: <20190718202948.3404-1-joe.lawrence@redhat.com> (raw)
The livepatching self-tests tweak the dynamic debug config to verify
the kernel log during the tests. Enhance set_dynamic_debug() so that
the config changes are restored when the script exits.
Note this functionality needs to keep in sync with:
- dynamic_debug input/output formatting
- functions affected by set_dynamic_debug()
For example, push_dynamic_debug() transforms:
kernel/livepatch/transition.c:530 [livepatch]klp_init_transition =_ "'%s': initializing %s transition\012"
to:
file kernel/livepatch/transition.c line 530 =_
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
---
.../testing/selftests/livepatch/functions.sh | 26 ++++++++++++++-----
1 file changed, 20 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
index de5a504ffdbc..860f27665ebd 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,
--
2.21.0
next reply other threads:[~2019-07-18 20:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-18 20:29 Joe Lawrence [this message]
2019-07-18 20:42 ` [PATCH] selftests/livepatch: push and pop dynamic debug config Joe Lawrence
2019-07-19 10:46 ` Petr Mladek
2019-07-30 17:31 ` Joe Lawrence
2019-07-30 21:26 ` shuah
2019-07-30 21:52 ` shuah
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