linux-kernel - Re: [PATCH 1/3] of: dynamic: add of_property_alloc() and of_property

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Date:   Fri, 6 May 2022 09:43:39 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Frank Rowand <frowand.list@...il.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Daniel Henrique Barboza <danielhb413@...il.com>,
        David Gibson <david@...son.dropbear.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Ohhoon Kwon <ohoono.kwon@...sung.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        YueHaibing <yuehaibing@...wei.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: Re: [PATCH 1/3] of: dynamic: add of_property_alloc() and
 of_property_free()

Le Thu, 5 May 2022 12:37:38 -0500,
Rob Herring <robh@...nel.org> a écrit :

> > >   
> > > -	/* mark the property as dynamic */
> > > -	of_property_set_flag(new, OF_DYNAMIC);
> > > +	prop->value = kzalloc(alloc_len, allocflags);
> > > +	if (!prop->value)
> > > +		goto out_err;
> > >   
> > > -	return new;
> > > +	if (value)
> > > +		memcpy(prop->value, value, value_len);  
> > 
> > Could you use kmemdup() instead of kzalloc+memcpy ?  
> 
> I'd prefer there be 1 alloc for struct property and value instead of 2. 
> And maybe 'name' gets rolled into it too, but that gets a bit more 
> complicated to manage I think. 

At least for value it should be easy indeed. i'll check what I can do
for the name.

> 
> With memcpy, note this series[1].

Ok, good to know, should I base my series on that one ?

> 
> Rob
> 
> [1] https://lore.kernel.org/all/20220504014440.3697851-30-keescook@chromium.org/


-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com