kernel-hardening - Re: [PATCH 0/3] Modernize tasklet callback API

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Date: Wed, 12 Aug 2020 08:21:13 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Kees Cook <keescook@...omium.org>
Cc: Allen <allen.lkml@...il.com>,
	devel@...verdev.osuosl.org,
	linux-s390@...r.kernel.org,
	alsa-devel@...a-project.org,
	Oscar Carter <oscar.carter@....com>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-input@...r.kernel.org,
	kgdb-bugreport@...ts.sourceforge.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Romain Perier <romain.perier@...il.com>,
	Will Deacon <will@...nel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 0/3] Modernize tasklet callback API

On Tue, 11 Aug 2020 23:33:13 +0200,
Kees Cook wrote:
> 
> On Mon, Aug 03, 2020 at 02:16:15PM +0530, Allen wrote:
> > Here's the series re-based on top of 5.8
> > https://github.com/allenpais/tasklets/tree/V3
> 
> Great!
> 
> > Let me know how you would want these to be reviewed.
> 
> Was a Coccinelle script used for any of these conversions? I wonder if
> it'd be easier to do a single treewide patch for the more mechanical
> changes.
> 
> And, actually, I still think the "prepare" patches should just be
> collapsed into the actual "covert" patches -- there are only a few.
> 
> After those, yeah, I think getting these sent to their respective
> maintainers is the next step.
> 
> > Also, I was thinking if removing tasklets completely could be a task
> > on KSPP wiki. If yes, I did like to take ownership of that task. I have a
> > couple of ideas in mind, which could be discussed in a separate email.
> 
> Sure! I will add it to the tracker. Here's for the refactoring:
> https://github.com/KSPP/linux/issues/30
> 
> and here's for the removal:
> https://github.com/KSPP/linux/issues/94
> 
> if you can added details/examples of how they should be removed, that'd
> help other folks too, if they wanted to jump in. :)

I have a patch set to convert the remaining tasklet usage in sound
drivers to either the threaded IRQ or the work, but it wasn't
submitted / merged for 5.8 due to the obvious conflict with your API
changes.
Each conversion is rather simple, but it's always a question of the
nature of each tasklet usage which alternative is the best fit.

FWIW, the current version is found in test/kill-tasklet branch of
sound git tree
  git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git


thanks,

Takashi

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