netdev - Re: [PATCH net-next-2.6] net: inet_add

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

Date:	Wed, 8 Sep 2010 16:49:27 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] net: inet_add_protocol() can use cmpxchg()

On Wed, Sep 8, 2010 at 3:56 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Use cmpxchg() to get rid of spinlocks in inet_add_protocol() and
> friends.
>
> inet_protos[] & inet6_protos[] are moved to read_mostly section
>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

What's the benefit to this?  It's hard to imagine that add/deleting
protocols is highly contended.  On the other hand, a simple spinlock
is very easy to look at and verify correct, while this takes a little
more thought.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html