linux-kernel - Re: [PATCH v1] clk: Convert managed get functions to devm_add

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Date:   Sun, 1 Dec 2019 17:42:37 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v1] clk: Convert managed get functions to devm_add_action
 API

On Thu, Nov 28, 2019 at 10:56:30AM -0800, Bjorn Andersson wrote:
> On Tue 26 Nov 08:13 PST 2019, Marc Gonzalez wrote:
> 
> > Date: Tue, 26 Nov 2019 13:56:53 +0100
> > 
> > Using devm_add_action_or_reset() produces simpler code and smaller
> > object size:
> > 
> > 1 file changed, 16 insertions(+), 46 deletions(-)
> > 
> >     text	   data	    bss	    dec	    hex	filename
> > -   1797	     80	      0	   1877	    755	drivers/clk/clk-devres.o
> > +   1499	     56	      0	   1555	    613	drivers/clk/clk-devres.o
> > 
> > Signed-off-by: Marc Gonzalez <marc.w.gonzalez@...e.fr>
> 
> Looks neat
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

This however increases the runtime costs as each custom action cost us
an extra pointer. Given that in a system we likely have many clocks
managed by devres, I am not sure that this code savings is actually
gives us overall win. It might still, I just want to understand how we
are allocating/packing devres structures.

Thanks.

-- 
Dmitry