diff options
Diffstat (limited to 'tools/testing/selftests/livepatch/functions.sh')
| -rw-r--r-- | tools/testing/selftests/livepatch/functions.sh | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh index 8ec0cb64ad94..a65b7b1ac8ad 100644 --- a/tools/testing/selftests/livepatch/functions.sh +++ b/tools/testing/selftests/livepatch/functions.sh @@ -4,6 +4,8 @@ # Shell functions for the rest of the scripts. +export LC_ALL=C + MAX_RETRIES=600 RETRY_INTERVAL=".1" # seconds SYSFS_KERNEL_DIR="/sys/kernel" @@ -124,6 +126,20 @@ function set_ftrace_enabled() { echo "livepatch: kernel.ftrace_enabled = $result" > /dev/kmsg } +# ftrace_disable_supported() - probe whether kernel.ftrace_enabled=0 +# can still disable ftrace on this kernel. Newer kernels deprecate +# the knob and always refuse the write with -EOPNOTSUPP. +function ftrace_disable_supported() { + local orig result + + orig=$(sysctl --values kernel.ftrace_enabled) + sysctl -q kernel.ftrace_enabled=0 &> /dev/null + result=$(sysctl --values kernel.ftrace_enabled) + sysctl -q "kernel.ftrace_enabled=$orig" &> /dev/null + + [[ "$result" == "0" ]] +} + function cleanup() { pop_config } @@ -339,6 +355,16 @@ function check_result { fi } +# does_sysfs_exist(modname, attr) - check sysfs attribute existence +# modname - livepatch module creating the sysfs interface +# attr - attribute name to be checked +function does_sysfs_exist() { + local mod="$1"; shift + local attr="$1"; shift + + [[ -f "$SYSFS_KLP_DIR/$mod/$attr" ]] +} + # check_sysfs_rights(modname, rel_path, expected_rights) - check sysfs # path permissions # modname - livepatch module creating the sysfs interface |