linux-kernel - Re: [PATCH 01/14] wireguard: allowedips: replace call_rcu by kfree_rcu for simple kmem_cache

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Date: Sun, 9 Jun 2024 16:36:15 +0200 (CEST)
From: Julia Lawall <julia.lawall@...ia.fr>
To: "Jason A. Donenfeld" <Jason@...c4.com>
cc: Julia Lawall <Julia.Lawall@...ia.fr>, kernel-janitors@...r.kernel.org, 
    "David S. Miller" <davem@...emloft.net>, 
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
    Paolo Abeni <pabeni@...hat.com>, wireguard@...ts.zx2c4.com, 
    netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
    "Paul E . McKenney" <paulmck@...nel.org>, Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 01/14] wireguard: allowedips: replace call_rcu by kfree_rcu
 for simple kmem_cache_free callback



On Sun, 9 Jun 2024, Jason A. Donenfeld wrote:

> Hi Julia & Vlastimil,
>
> On Sun, Jun 09, 2024 at 10:27:13AM +0200, Julia Lawall wrote:
> > Since SLOB was removed, it is not necessary to use call_rcu
> > when the callback only performs kmem_cache_free. Use
> > kfree_rcu() directly.
>
> Thanks, I applied this to the wireguard tree, and I'll send this out as
> a fix for 6.10. Let me know if this is unfavorable to you and if you'd
> like to take this somewhere yourself, in which case I'll give you my
> ack.

Please push it onward.

julia

>
> Just a question, though, for Vlastimil -- I know that with the SLOB
> removal, kfree() is now allowed on kmemcache'd objects. Do you plan to
> do a blanket s/kmem_cache_free/kfree/g at some point, and then remove
> kmem_cache_free all together?
>
> Jason
>