linux-kernel - Re: [PATCH -v4 1/8] locking/drm: Kill mutex trickery

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Date:   Tue, 18 Oct 2016 14:48:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Waiman Long <waiman.long@....com>,
        Jason Low <jason.low2@....com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <Will.Deacon@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Imre Deak <imre.deak@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Terry Rudd <terry.rudd@....com>,
        "Paul E. McKenney" <paulmck@...ibm.com>,
        Jason Low <jason.low2@...com>
Cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Rob Clark <robdclark@...il.com>
Subject: Re: [PATCH -v4 1/8] locking/drm: Kill mutex trickery

On Fri, Oct 07, 2016 at 04:52:44PM +0200, Peter Zijlstra wrote:
> Poking at lock internals is not cool. Since I'm going to change the
> implementation this will break, take it out.
> 
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: Rob Clark <robdclark@...il.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  drivers/gpu/drm/i915/i915_gem_shrinker.c |   26 +++-----------------------
>  drivers/gpu/drm/msm/msm_gem_shrinker.c   |   23 +++--------------------
>  2 files changed, 6 insertions(+), 43 deletions(-)

OK, so it appears that i915 changed their locking around and got rid of
this thing entirely. Much appreciated Chris!!

Rob, is there any chance you can do the same for msm?

Not having to provide a replacement function and opening the door to
recursive locking would be ever so good.