linux-kernel - Re: [slubllv7 06/17] slub: Add cmpxchg_double

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Date:	Tue, 12 Jul 2011 11:47:53 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	David Rientjes <rientjes@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [slubllv7 06/17] slub: Add cmpxchg_double_slab()

On Tue, 12 Jul 2011, Eric Dumazet wrote:

> Le mardi 12 juillet 2011 à 10:59 -0500, Christoph Lameter a écrit :
>
> > We do not need to have _count included. This is just there because the
> > field is in the way on 64 bit and we can only do 2x 64 bit cmpxchges.  On
> > 32 bi we can drop _count from "counters".
> >
>
> OK, thanks for clarification.

Still I'd like to get some ideas on how to make the whole thing much
cleaner. Isnt there some way to convert a struct to an unsigned long
without going through a union? And a way to convert a struct + 32 bit
atomic_t into a 64 bit unsigned long? Would simplify things significantly.