linux-kernel - Re: slub: UML and CONFIG_CMPXCHG

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Message-ID: <alpine.DEB.2.00.1105310929230.18004@router.home>
Date:	Tue, 31 May 2011 09:30:21 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Richard Weinberger <richard@....at>
cc:	linux-kernel@...r.kernel.org, penberg@...nel.org
Subject: Re: slub: UML and CONFIG_CMPXCHG_LOCAL

On Sun, 29 May 2011, Richard Weinberger wrote:

> 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().

It does not have to implement it. The this_cpu_ops can fall back to
generic implementations.

> Is there anything I can do to have slub on UML?

Yes, rely on the generic implementation of this_cpu_cmpxchg.
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