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Date:   Sun, 12 Apr 2020 21:31:43 -0700
From:   Nicolin Chen <nicoleotsuka@gmail.com>
To:     Shengjiu Wang <shengjiu.wang@gmail.com>
Cc:     Shengjiu Wang <shengjiu.wang@nxp.com>,
        Mark Rutland <mark.rutland@arm.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Linux-ALSA <alsa-devel@alsa-project.org>,
        Timur Tabi <timur@kernel.org>, Xiubo Li <Xiubo.Lee@gmail.com>,
        linuxppc-dev@lists.ozlabs.org, Takashi Iwai <tiwai@suse.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Brown <broonie@kernel.org>,
        Fabio Estevam <festevam@gmail.com>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v6 5/7] ASoC: fsl_asrc: Move common definition to
 fsl_asrc_common
Message-ID: <20200413043143.GA9116@Asurada>
References: <cover.1585726761.git.shengjiu.wang@nxp.com>
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On Mon, Apr 13, 2020 at 11:16:31AM +0800, Shengjiu Wang wrote:
> On Sun, Apr 12, 2020 at 10:08 AM Nicolin Chen <nicoleotsuka@gmail.com> wrote:
> >
> > On Sat, Apr 11, 2020 at 01:49:43PM +0800, Shengjiu Wang wrote:
> >
> > > > > diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c
> > > > > index b15946e03380..5cf0468ce6e3 100644
> > > > > --- a/sound/soc/fsl/fsl_asrc_dma.c
> > > > > +++ b/sound/soc/fsl/fsl_asrc_dma.c
> > > >
> > > > > @@ -311,11 +311,12 @@ static int fsl_asrc_dma_startup(struct snd_soc_component *component,
> > > > >               return ret;
> > > > >       }
> > > > >
> > > > > -     pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
> > > > > +     pair = kzalloc(sizeof(struct fsl_asrc_pair) + PAIR_PRIVAT_SIZE, GFP_KERNEL);
> > > >
> > > > If we only use the PAIR_PRIVATE_SIZE here, maybe we can put the
> > > > define in this file too, rather than in the header file.
> > > >
> > > > And could fit 80 characters:
> > > >
> > > > +       pair = kzalloc(sizeof(*pair) + PAIR_PRIVAT_SIZE, GFP_KERNEL);
> >
> > > I will use a function pointer
> > >     int (*get_pair_priv_size)(void)
> >
> > Since it's the size of pair or cts structure, could be just a
> > size_t variable?
> 
> Yes, should be "size_t (*get_pair_priv_size)(void)"

Does it have to be a function? -- how about this:

struct pair {
	...
	size_t private_size;
	void *private;
};

probe/or-somewhere() {
	...
	pair->private = pair_priv;
	pair->private_size = sizeof(*pair_priv);
	...
}