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

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Date: Tue, 19 Mar 2024 16:52:02 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Kairui Song <kasong@...cent.com>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] lib/xarray: introduce a new helper xas_get_order

On Tue, Mar 19, 2024 at 05:27:32PM +0800, Kairui Song wrote:
> From: Kairui Song <kasong@...cent.com>
> 
> It can be used after xas_load to check the order of loaded entries.
> Compared to xa_get_order, it saves an XA_STATE and avoid a rewalk.
> 
> Signed-off-by: Kairui Song <kasong@...cent.com>

Brilliant; yes.  I was just looking at this the other day and wondering
why I hadn't done this.

Acked-by: Matthew Wilcox (Oracle) <willy@...radead.org>

> +EXPORT_SYMBOL(xas_get_order);

We don't have a module user yet, so I'd hold off on this.  It's an
unusual thing to want to do, and we may never have a modular user.
Also, xas functions are EXPORT_SYMBOL_GPL, not EXPORT_SYMBOL.