linux-kernel - Re: [PATCH v2 1/3] testing/radix-tree/maple: Hack around kfree

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Message-ID: <ttrjb4dhf7w6da3qqlav3kydcpohtimmdewvuxiojdvd3drn5n@rlxb6q656olb>
Date: Fri, 15 Aug 2025 18:06:49 +0100
From: Pedro Falcato <pfalcato@...e.de>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>, 
	Matthew Wilcox <willy@...radead.org>, maple-tree@...ts.infradead.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: Re: [PATCH v2 1/3] testing/radix-tree/maple: Hack around kfree_rcu
 not existing

On Fri, Aug 15, 2025 at 11:11:30AM -0400, Liam R. Howlett wrote:
> * Pedro Falcato <pfalcato@...e.de> [250812 12:21]:
> > liburcu doesn't have kfree_rcu (or anything similar). Despite that, we
> > can hack around it in a trivial fashion, by adding a wrapper.
> > 
> > This wrapper only works for maple_nodes, and not anything else (due to
> > us not being able to know rcu_head offsets in any way), and thus we take
> > advantage of the type checking to avoid future silent breakage.
> > 
> > Reviewed-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
> > Signed-off-by: Pedro Falcato <pfalcato@...e.de>
> 
> 
> Andrew,
> 
> Please drop this patch set.  We will have it go through Vlastimil's tree
> to avoid conflicts with other work and to maintain the userspace testing
> in mm-new while that happens.

In case this helps, Andrew, it's maple_tree-use-kfree_rcu-in-ma_free_rcu.patch
and testing-radix-tree-maple-hack-around-kfree_rcu-not-existing.patch in your series file.

(Yes, I should have used a cover letter here, it would've made it easier to
manage, my mistake)

-- 
Pedro