livepatch: Remove reliable stacktrace check in klp_try_switch_task()

Support for immediate flag was removed by commit d0807da78e11
("livepatch: Remove immediate feature").  We bail out during
patch registration for architectures, those don't support
reliable stack trace. Remove the check in klp_try_switch_task(),
as its not required.

Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 0 insertions, 7 deletions

diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index 7c6631e693bc..5bc349805e03 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -310,13 +310,6 @@ static bool klp_try_switch_task(struct task_struct *task)
                 return true;
 
         /*
-         * For arches which don't have reliable stack traces, we have to rely
-         * on other methods (e.g., switching tasks at kernel exit).
-         */
-        if (!klp_have_reliable_stack())
-                return false;
-
-        /*
          * Now try to check the stack for any to-be-patched or to-be-unpatched
          * functions.  If all goes well, switch the task to the target patch
          * state.