netdev - Re: [PATCH net-next] wireguard: Using kfree

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 12 Dec 2019 14:18:39 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Wei Yongjun <weiyongjun1@...wei.com>
Cc:     WireGuard mailing list <wireguard@...ts.zx2c4.com>,
        Netdev <netdev@...r.kernel.org>, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] wireguard: Using kfree_rcu() to simplify the code

Hi Wei,

On Thu, Dec 12, 2019 at 1:03 PM Wei Yongjun <weiyongjun1@...wei.com> wrote:
> The callback function of call_rcu() just calls a kfree(), so we
> can use kfree_rcu() instead of call_rcu() + callback function.
>
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>

Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

I've queued this up as:
https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/wireguard-linux.git/commit/?id=2ddefeb5872878fe2fffb83664c02bd104fb1a52
I'll submit this to net-next next week as part of a cleanup series I'm
preparing.

In case you're curious, this originally was call_rcu_bh, as there was
no kfree_rcu_bh function. Since the _bh functions got unified a few
releases ago, this was changed to just a simple call_rcu, but
apparently missed the optimization you've done here using kfree_rcu.
So thanks for the patch.

Regards,
Jason