linux-kernel - Re: [Intel-gfx] How is the progress for removing flush_scheduled

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Message-ID: <Y3TgO7pHo9z9FINO@intel.com>
Date:   Wed, 16 Nov 2022 15:06:03 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] How is the progress for removing
 flush_scheduled_work() callers?

On Wed, Nov 16, 2022 at 12:08:27PM +0200, Jani Nikula wrote:
> On Sun, 06 Nov 2022, Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
> > Like commit c4f135d643823a86 ("workqueue: Wrap flush_workqueue() using a
> > macro") says, flush_scheduled_work() is dangerous and will be forbidden.
> > We are on the way for removing all flush_scheduled_work() callers from
> > the kernel, and there are only 4 callers remaining as of linux-20221104.
> >
> >   drivers/gpu/drm/i915/display/intel_display.c:8997:      flush_scheduled_work();
> 
> Thanks for the reminder, I've pinged folks to get someone working on
> this. We do schedule quite a bunch of work, so it's not immediately
> obvious (at least to me) what exactly needs flushing.

Here's my earlier cursory analysis of the subject:
https://lore.kernel.org/intel-gfx/Yy3byxFrfAfQL9xK@intel.com/

> 
> https://gitlab.freedesktop.org/drm/intel/-/issues/7546
> 
> >   drivers/gpu/drm/i915/gt/selftest_execlists.c:88:        flush_scheduled_work();
> 
> Removed by commit 7d33fd02dd94 ("drm/i915/selftests: Remove
> flush_scheduled_work() from live_execlists") in drm-next.
> 
> BR,
> Jani.
> 
> -- 
> Jani Nikula, Intel Open Source Graphics Center

-- 
Ville Syrjälä
Intel