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selftests/livepatch: Make dynamic debug setup and restore generic

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Livepatch selftests currently save the current dynamic debug config and
tweak it for the selftests. The config is restored at the end. Make the
infrastructure generic, so that more variables can be saved and
restored.

Link: http://lkml.kernel.org/r/20191016113316.13415-3-mbenes@suse.cz

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Joe Lawrence 2019-10-16 13:33:14 +02:00 committed by Steven Rostedt
parent 7162431dcf
commit 35c9e74cff
4 changed files with 16 additions and 12 deletions
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22
tools/testing/selftests/livepatch/functions.sh
View File

@ -29,29 +29,33 @@ function die() {
exit 1
}
function push_dynamic_debug() {
DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
function push_config() {
DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
}
function pop_dynamic_debug() {
function pop_config() {
if [[ -n "$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() {
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
}
# setup_config - save the current config and set a script exit trap that
# restores the original config. Setup the dynamic debug
# for verbose livepatching output.
function setup_config() {
push_config
set_dynamic_debug
trap pop_config EXIT INT TERM HUP
}
# loop_until(cmd) - loop a command until it is successful or $MAX_RETRIES,
# sleep $RETRY_INTERVAL between attempts
# cmd - command and its arguments to run

2
tools/testing/selftests/livepatch/test-callbacks.sh
View File

@ -9,7 +9,7 @@ MOD_LIVEPATCH2=test_klp_callbacks_demo2
MOD_TARGET=test_klp_callbacks_mod
MOD_TARGET_BUSY=test_klp_callbacks_busy
set_dynamic_debug
setup_config
# TEST: target module before livepatch

2
tools/testing/selftests/livepatch/test-livepatch.sh
View File

@ -7,7 +7,7 @@
MOD_LIVEPATCH=test_klp_livepatch
MOD_REPLACE=test_klp_atomic_replace
set_dynamic_debug
setup_config
# TEST: basic function patching

2
tools/testing/selftests/livepatch/test-shadow-vars.sh
View File

@ -6,7 +6,7 @@
MOD_TEST=test_klp_shadow_vars
set_dynamic_debug
setup_config
# TEST: basic shadow variable API