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selftests/livepatch: push and pop dynamic debug config

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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 the following:
    file kernel/livepatch/transition.c line 530 =_

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Joe Lawrence 2019-07-18 16:29:48 -04:00 committed by Shuah Khan
parent fc2e634e99
commit fbb01c5247
1 changed files with 20 additions and 6 deletions
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26
tools/testing/selftests/livepatch/functions.sh
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@ -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,