Commit 1d98a69e authored Jul 12, 2018 by Kamalesh Babulal Committed by Jiri Kosina Jul 16, 2018

livepatch: Remove reliable stacktrace check in klp_try_switch_task()



Support for immediate flag was removed by commit d0807da7
("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>

parent 41e3bef5

kernel/livepatch/transition.c

+0 −7

Original line number	Diff line number	Diff line
		@@ -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