livepatch: Remove reliable stacktrace check in klp_try_switch_task()

kamalesh-babulal · Jiri Kosina · commit 1d98a69e5cef · 2018-07-16T17:50:33.000+02:00
Support for immediate flag was removed by commit d0807da ("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>
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
@@ -309,13 +309,6 @@ static bool klp_try_switch_task(struct task_struct *task)
 	if (task->patch_state == klp_target_state)
 		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
