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livepatch: Remove reliable stacktrace check in klp_try_switch_task()

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Support for immediate flag was removed by commit d0807da78e
("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>
This commit is contained in:
Kamalesh Babulal 2018-07-12 13:35:06 +05:30 committed by Jiri Kosina
parent 41e3bef52e
commit 1d98a69e5c
1 changed files with 0 additions and 7 deletions
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7
kernel/livepatch/transition.c
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@ -309,13 +309,6 @@ static bool klp_try_switch_task(struct task_struct *task)
if (task->patch_state == klp_target_state) if (task->patch_state == klp_target_state)
return true; 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 * 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 * functions. If all goes well, switch the task to the target patch