Re: [PATCH v2 3/5] md: use md_thread api to wake up sync_thread

[Yu Kuai]

Hi,

在 2023/03/17 11:30, Yu Kuai 写道:
> Hi,
>
> 在 2023/03/17 10:30, kernel test robot 写道:
> > Greeting,
> >
> > FYI, we noticed INFO:task_blocked_for_more_than#seconds due to commit 
> > (built with gcc-11):
> >
> > commit: af2203c7e88c00d3ce072f18c18a36e2936372fd ("[PATCH v2 3/5] md: 
> > use md_thread api to wake up sync_thread")
> > url: 
> > https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/md-pass-a-md_thread-pointer-to-md_register_thread/20230315-142018 
> >
> > base: git://git.kernel.org/cgit/linux/kernel/git/song/md.git md-next
> > patch link: 
> > https://lore.kernel.org/all/20230315061810.653263-4-yukuai1@xxxxxxxxxxxxxxx/ 
> >
> > patch subject: [PATCH v2 3/5] md: use md_thread api to wake up 
> > sync_thread
>
> I don't expect there is any difference between:
>
> if (mddev->sync_thread)
>      wake_up_process(mddev->sync_thread->tsk);
>
> and:
>
> md_wakeup_thread(mddev->sync_thread);

I understand that they are different now.

md_wakeup_thread() only wakeup wait_event() from md_thread(), it will
not wake up 'md_thread->tsk' if it's runing.

Hence this patch is wrong.

Thanks,
Kuai