Commit 383439d3 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Peter Zijlstra
Browse files

livepatch: Skip task_call_func() for current task 



The current task doesn't need the scheduler's protection to unwind its
own stack.

Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Tested-by: default avatarSeth Forshee (DigitalOcean) <sforshee@kernel.org>
Link: https://lore.kernel.org/r/4b92e793462d532a05f03767151fa29db3e68e13.1677257135.git.jpoimboe@kernel.org
parent e92606fa

kernel/livepatch/transition.c

+5 −1
Original line number Diff line number Diff line
@@ -312,7 +312,11 @@ static bool klp_try_switch_task(struct task_struct *task) 
	 * functions.  If all goes well, switch the task to the target patch

	 * state.

	 */

	if (task == current)

		ret = klp_check_and_switch_task(current, &old_name);

	else

		ret = task_call_func(task, klp_check_and_switch_task, &old_name);



	switch (ret) {

	case 0:		/* success */

		break;