From mboxrd@z Thu Jan  1 00:00:00 1970
From: Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH v5 1/4] resource: Move reparent_resources() to
 kernel/resource.c and make it public
Date: Tue, 12 Jun 2018 17:49:23 +0800
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Cc: Nicolas Pitre <nicolas.pitre-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, brijesh.singh-5C7GfCeVMHo@public.gmane.org, devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, David Airlie <airlied-cv59FeDIM0c@public.gmane.org>, linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, richard.weiyang-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, Keith Busch <keith.busch-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Max Filippov <jcmvbkbc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>, baiyaowei-0p4V/sDNsUmm0O/7XYngnFaTQe2KTcn/@public.gmane.org, KY Srinivasan <kys-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>, Frank Rowand <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>, Stephen Hemminger <sthemmin-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>, Patrik Jakobsson <patrik.r.jakobsson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, linux-input <linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Gustavo Padovan <gustavo-THi1TnShQwVAfugRpC6u6w@public.gmane.org>, Borislav Petkov <bp-l3A5Bk7waGM@public.gmane.org>, Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Tom Lendacky <thomas.lendacky-5C7GfCeVMHo@public.gmane.org>, Haiyang Zhang <haiyangz-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>, Maarten Lankhorst <maarten.lankhorst-VuQAYsv1561eoWH0uzbU5w@public.gmane.org>
List-Id: linux-input@vger.kernel.org

On 06/12/18 at 11:29am, Andy Shevchenko wrote:
> On Tue, Jun 12, 2018 at 6:28 AM, Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> > reparent_resources() is duplicated in arch/microblaze/pci/pci-common.c
> > and arch/powerpc/kernel/pci-common.c, so move it to kernel/resource.c
> > so that it's shared. Later its code also need be updated using list_head
> > to replace singly linked list.
> 
> While this is a good deduplication of the code, some requirements for
> public functions would be good to satisfy.
> 
> > +/*
> > + * Reparent resource children of pr that conflict with res
> > + * under res, and make res replace those children.
> > + */
> 
> kernel doc format, though...

Will rewrite it, thanks.

> 
> > +static int reparent_resources(struct resource *parent,
> > +                                    struct resource *res)
> 
> ...is it really public with static keyword?!
> 
> 
> 
> > +{
> 
> > +       for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
> > +               if (p->end < res->start)
> > +                       continue;
> > +               if (res->end < p->start)
> > +                       break;
> 
> > +               if (p->start < res->start || p->end > res->end)
> > +                       return -1;      /* not completely contained */
> 
> Usually we are expecting real eeror codes.
> 
> > +               if (firstpp == NULL)
> > +                       firstpp = pp;
> > +       }
> 
> > +       if (firstpp == NULL)
> > +               return -1;      /* didn't find any conflicting entries? */
> 
> Ditto.
> 
> > +}
> > +EXPORT_SYMBOL(reparent_resources);
> 
> -- 
> With Best Regards,
> Andy Shevchenko