[PATCH 2/3] livepatch: Remove duplicate warning about missing reliable stacktrace support

[Petr Mladek]

WARN_ON_ONCE() could not be called safely under rq lock because
of console deadlock issues.

It can be simply removed. A better descriptive message is written
in klp_enable_patch() when klp_have_reliable_stack() fails.
The remaining debug message is good enough.

Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
---
 kernel/livepatch/transition.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index abb2a4a2cbb2..1bf362df76e1 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",
-- 
2.16.4