From: Petr Mladek <pmladek@xxxxxxxx> WARN_ON_ONCE() could not be called safely under rq lock because of console deadlock issues. Moreover WARN_ON_ONCE() is superfluous in klp_check_stack(), because stack_trace_save_tsk_reliable() cannot return -ENOSYS thanks to klp_have_reliable_stack() check in klp_try_switch_task(). Signed-off-by: Petr Mladek <pmladek@xxxxxxxx> [ mbenes: changelog edited ] Signed-off-by: Miroslav Benes <mbenes@xxxxxxx> --- kernel/livepatch/transition.c | 1 - 1 file changed, 1 deletion(-) diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index 7e7ef04689d1..cdf318d86dd6 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -247,7 +247,6 @@ static int klp_check_stack(struct task_struct *task, char *err_buf) int ret, nr_entries; ret = stack_trace_save_tsk_reliable(task, entries, ARRAY_SIZE(entries)); - WARN_ON_ONCE(ret == -ENOSYS); if (ret < 0) { snprintf(err_buf, STACK_ERR_BUF_SIZE, "%s: %s:%d has an unreliable stack\n", -- 2.21.0