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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: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
Link: https://lore.kernel.org/r/4b92e793462d532a05f03767151fa29db3e68e13.1677257135.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf 2023-02-24 08:49:59 -08:00 committed by Peter Zijlstra
parent e92606fa17
commit 383439d3d4
1 changed files with 5 additions and 1 deletions
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6
kernel/livepatch/transition.c
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@ -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.
*/
ret = task_call_func(task, klp_check_and_switch_task, &old_name);
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;