linux-kernel - Re: [PATCH RT 0/1] Linux v4.19.312-rt134-rc2

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Date: Tue, 7 May 2024 13:11:31 +0200
From: Daniel Wagner <wagi@...om.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: stable-rt@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>, 
	Thomas Gleixner <tglx@...utronix.de>, linux-rt-users@...r.kernel.org, 
	LKML <linux-kernel@...r.kernel.org>, Tom Zanussi <tom.zanussi@...ux.intel.com>, 
	Clark Williams <williams@...hat.com>
Subject: Re: [PATCH RT 0/1] Linux v4.19.312-rt134-rc2

Hi Sebastian,

On Tue, May 07, 2024 at 11:54:07AM GMT, Sebastian Andrzej Siewior wrote:
> I compared mine outcome vs v4.19-rt-next and the diff at the bottom came
> out:
> 
> - timer_delete_sync() used to have "#if 0" block around
>   lockdep_assert_preemption_enabled() because the function is not part
>   of v4.19. You ended up with might_sleep() which is a minor change.
>   Your queue as of a previous release had the if0 block (in
>   __del_timer_sync()).
>   I would say this is minor but looks like a miss-merge. Therefore I
>   would say it should go back for consistency vs previous release and
>   not change it due to conflicts.

Makes sense.

> - The timer_delete_sync() is structured differently with
>   __del_timer_sync(). That function invokes timer_sync_wait_running()
>   which drops two locks which are not acquired. That is wrong. It should
>   have been del_timer_wait_running().

Understood. I was a bit strungling here. Glad you caught this error.

> I suggest you apply the diff below to align it with later versions. It
> also gets rid of the basep argument in __try_to_del_timer_sync() which
> is not really used.

Will do.

> As an alternative I can send you my rebased queue if this makes it
> easier for you.

Yes please, this makes it easy to sync the rebase branch.

Thanks a lot!

Cheers,
Daniel