linux-kernel - Re: [RFC PATCH] component: Add common helpers for compare/release functions

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Date:   Thu, 10 Feb 2022 15:49:53 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Robin Murphy <robin.murphy@....com>,
        <dri-devel@...ts.freedesktop.org>
CC:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        "James Wang" <james.qian.wang@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        <iommu@...ts.linux-foundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        <linux-kernel@...r.kernel.org>, "Joerg Roedel" <joro@...tes.org>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        <linux-mediatek@...ts.infradead.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Stephen Boyd" <sboyd@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Tomasz Figa <tfiga@...omium.org>,
        <srv_heupstream@...iatek.com>, Rob Clark <robdclark@...il.com>,
        "Srinivas Kandagatla" <srinivas.kandagatla@...aro.org>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [RFC PATCH] component: Add common helpers for compare/release
 functions

On Fri, 2022-01-28 at 13:04 +0000, Robin Murphy wrote:
> On 2022-01-28 08:11, Yong Wu wrote:
> [...]
> > diff --git a/include/linux/component.h b/include/linux/component.h
> > index 16de18f473d7..5a7468ea827c 100644
> > --- a/include/linux/component.h
> > +++ b/include/linux/component.h
> > @@ -2,6 +2,8 @@
> >   #ifndef COMPONENT_H
> >   #define COMPONENT_H
> >   
> > +#include <linux/device.h>
> > +#include <linux/of.h>
> >   #include <linux/stddef.h>
> >   
> >   
> > @@ -82,6 +84,22 @@ struct component_master_ops {
> >   	void (*unbind)(struct device *master);
> >   };
> >   
> > +/* A set common helpers for compare/release functions */
> > +static inline int compare_of(struct device *dev, void *data)
> > +{
> > +	return dev->of_node == data;
> > +}
> 
> Note that this is effectively just device_match_of_node(), although
> I 
> guess there is an argument that having a nice consistent set of 
> component_match API helpers might be worth more than a tiny code
> saving 
> by borrowing one from a different API.

Thanks for this tip. I could try use this, Let the maintainer decide.

> 
> Either way, however, I don't think there's any good argument for 
> instantiating separate copies of these functions in every driver
> that 
> uses them. If they're used as callbacks then they can't actually be 
> inlined anyway, so they may as well be exported from component.c as 

oh. The MTK iommu keeps this inline for long time... OK, I will try
to move into the component.c and export them.

(Sorry for the late reply due to New Year holidays.)

> normal so that the code really is shared (plus then there's nice 
> symmetry with the aforementioned device_match API helpers too).
> 
> Thanks,
> Robin.