On Wed, Jul 18, 2018 at 5:49 AM, Baoquan He <bhe@xxxxxxxxxx> 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.
Some minor stuff.
> +/**
> + * reparent_resources - reparent resource children of parent that res covers
> + * @parent: parent resource descriptor
> + * @res: resource descriptor desired by caller
> + *
> + * Returns 0 on success, -ENOTSUPP if child resource is not completely
> + * contained by 'res', -ECANCELED if no any conflicting entry found.
'res' -> @res
> + *
> + * Reparent resource children of 'parent' that conflict with 'res'
Ditto + 'parent' -> @parent
> + * under 'res', and make 'res' replace those children.
Ditto.
> + */
> +int reparent_resources(struct resource *parent, struct resource *res)
> +{
> + struct resource *p, **pp;
> + struct resource **firstpp = NULL;
> +
> + 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 -ENOTSUPP; /* not completely contained */
> + if (firstpp == NULL)
> + firstpp = pp;
> + }
> + if (firstpp == NULL)
> + return -ECANCELED; /* didn't find any conflicting entries? */
> + res->parent = parent;
> + res->child = *firstpp;
> + res->sibling = *pp;
> + *firstpp = res;
> + *pp = NULL;
> + for (p = res->child; p != NULL; p = p->sibling) {
> + p->parent = res;
> + pr_debug("PCI: Reparented %s %pR under %s\n",
> + p->name, p, res->name);
Now, PCI is a bit confusing here.
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL(reparent_resources);
> +
> static void __init __reserve_region_with_split(struct resource *root,
> resource_size_t start, resource_size_t end,
> const char *name)
> --
> 2.13.6
>
--
With Best Regards,
Andy Shevchenko
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