linux-kernel - Re: [PATCH] drm/i915/fbc: Avoid full proxy f

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Message-ID: <Y70Kpcpueh2Zzm1x@ubun2204.myguest.virtualbox.org>
Date:   Tue, 10 Jan 2023 12:20:13 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc:     Julia Lawall <julia.lawall@...ia.fr>,
        Nicolai Stange <nicstange@...il.com>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>,
        Deepak R Varma <drv@...lo.com>
Subject: Re: [PATCH] drm/i915/fbc: Avoid full proxy f_ops for FBC debug
 attributes

On Mon, Jan 09, 2023 at 02:06:13PM -0500, Rodrigo Vivi wrote:
> On Sun, Jan 08, 2023 at 01:33:41AM +0530, Deepak R Varma wrote:
> > On Thu, Jan 05, 2023 at 09:13:35AM +0100, Julia Lawall wrote:
> > > > Hi Julia, thanks for helping here.
> > > >
> > > > So, my question is why this
> > > >
> > > > make coccicheck M=drivers/gpu/drm/i915/ MODE=context COCCI=./scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
> > > >
> > > > didn't catch this chunck:
> > > >
> > > > -		debugfs_create_file("i915_fbc_false_color", 0644, parent,
> > > > -				    fbc, &intel_fbc_debugfs_false_color_fops);
> > > > +		debugfs_create_file_unsafe("i915_fbc_false_color", 0644, parent,
> > > > +					   fbc, &intel_fbc_debugfs_false_color_fops);
> > > >
> > > > When I run it it only catches and replaces this:
> > > >
> > > > - DEFINE_SIMPLE_ATTRIBUTE(dsa_fops, dsa_get, dsa_set, dsa_fmt);
> > > > + DEFINE_DEBUGFS_ATTRIBUTE(dsa_fops, dsa_get, dsa_set, dsa_fmt);
> > >
> > > There is something strange in your question.  You have MODE=context but
> > > you show the output for MODE=patch.  The rule dcf matches a call to
> > > debugfs_create_file, and the context rule matching DEFINE_SIMPLE_ATTRIBUTE
> > > is only activated if dcf succeeds.  So when the context rule gives a
> > > report, there is always a corresponding call to debugfs_create_file in the
> > > same file, it is just not highlighted.  So the request is that it should
> > > be highlighted as well?
> > 
> > Hello Rodrigo,
> > Not trying to speak for you, but I think Julia's comment appears to be the
> > correct interpretation of your observation. Would you mind confirming/clarifying
> > and suggest next steps for this proposal?
> 
> doh! newby coccinelle user detected! My bad, sorry!
> 
> make coccicheck M=drivers/gpu/drm/i915/ MODE=patch COCCI=./scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
> 
> do shows everything.
> 
> So, could you please mention this line in the commit message so we don't forget that?
Sure, I will do that.

> 
> Also could you please provide patches for the other cases?
> 1 patch for each file is desirable in this case since it touches different areas.
Sounds good. I will separate patches one per file and send in a series as
appropriate.

Thank you,
./drv

> 
> > 
> > Thank you,
> > ./drv
> > 
> > >
> > > julia
> > >
> > 
> >