From: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Date: Thu, 12 Jul 2018 13:35:06 +0530
Subject: livepatch: Remove reliable stacktrace check in klp_try_switch_task()
Git-commit: 1d98a69e5cef3aeb68bcefab0e67e342d6bb4dad
Patch-mainline: v4.19-rc1
References: bsc#1071995
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>
---
kernel/livepatch/transition.c | 7 -------
1 file changed, 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
@@ -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