linux-kernel - Re: [PATCH 2/2] um: Disable CONFIG_CMPXCHG

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:	Wed, 13 Apr 2011 15:56:26 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Richard Weinberger <richard@....at>
Cc:	akpm@...ux-foundation.com, slyich@...il.com,
	linux-kernel@...r.kernel.org, jdike@...toit.com,
	user-mode-linux-devel@...ts.sourceforge.net,
	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 2/2] um: Disable CONFIG_CMPXCHG_LOCAL

On Wed, Apr 13, 2011 at 3:41 PM, Richard Weinberger <richard@....at> wrote:
> Commit 8a5ec0ba "Lockless (and preemptless) fastpaths for slub"
> makes use of this_cpu_cmpxchg_double() which needs
> this_cpu_cmpxchg16b_emu() on x86_64.
> Implementing cmpxchg16b emulation for UML would introduce
> too much complexity. So just disable it.
>
> LKML-Reference: <20110412192014.GF16342@....dyndns.org>
> Reported-by: Sergei Trofimovich <slyich@...il.com>
> Signed-off-by: Richard Weinberger <richard@....at>

Acked-by: Pekka Enberg <penberg@...nel.org>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/