linux-kernel - slub: UML and CONFIG_CMPXCHG

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Message-Id: <201105292225.46544.richard@nod.at>
Date:	Sun, 29 May 2011 22:25:46 +0200
From:	Richard Weinberger <richard@....at>
To:	cl@...ux.com
Cc:	linux-kernel@...r.kernel.org, penberg@...nel.org
Subject: slub: UML and CONFIG_CMPXCHG_LOCAL

Christoph,

With commit 1759415e you've removed all #ifdef CONFIG_CMPXCHG_LOCAL's from slub.
This change breaks slub (again) on UML.
UML does not implement this_cpu_cmpxchg16b_emu().

Starting with 2.6.39 (commit 084189a) I've disabled CONFIG_CMPXCHG_LOCAL on UML do bypass the issue.
This fix does no longer help.

Is there anything I can do to have slub on UML?
Implementing this_cpu_cmpxchg16b_emu for UML is not really an option.
See:
http://comments.gmane.org/gmane.linux.kernel/1125183

Thanks,
//richard

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