linux-kernel - Re: [PATCH v3 3/4] lib/xarray: introduce a new helper xas_get

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Date: Tue, 16 Apr 2024 11:51:31 +0800
From: Kairui Song <ryncsn@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/4] lib/xarray: introduce a new helper xas_get_order

On Tue, Apr 16, 2024 at 3:06 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Tue, Apr 16, 2024 at 01:18:55AM +0800, Kairui Song wrote:
> >  /**
> > - * xa_get_order() - Get the order of an entry.
> > - * @xa: XArray.
> > - * @index: Index of the entry.
> > + * xas_get_order() - Get the order of an loaded entry after xas_load.
>
> I'd just leave that as "Get the order of an entry." as it doesn't have
> to be after calling xas_load(), it could be from any other operation
> that moves xas.  Also this is the short description!

Good suggestion!

>
> >               if (slot >= XA_CHUNK_SIZE)
> >                       break;
> > -             if (!xa_is_sibling(xas.xa_node->slots[slot]))
> > +             if (!xa_is_sibling(xas->xa_node->slots[slot]))
>
> Could you fold in this change I have locally?
>
> -               if (!xa_is_sibling(xas->xa_node->slots[slot]))
> +               if (!xa_is_sibling(xa_entry(xas.xa, xas.xa_node, slot)))
>
> That fixes a sparse warning which existed before your modifications.
>

OK.