linux-kernel - Re: [PATCH 0/2] jump label: 2.6.38 updates

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Message-ID: <BLU0-SMTP40692195814CA4739BB0FB96D00@phx.gbl>
Date:	Mon, 14 Feb 2011 18:52:49 -0500
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	David Miller <davem@...emloft.net>
CC:	matt@...sole-pimps.org, rostedt@...dmis.org, peterz@...radead.org,
	will.newton@...il.com, jbaron@...hat.com, hpa@...or.com,
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	fweisbec@...il.com, avi@...hat.com, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org, vapier@...too.org,
	cmetcalf@...era.com, dhowells@...hat.com, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, benh@...nel.crashing.org,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates

* Mathieu Desnoyers (mathieu.desnoyers@...ymtl.ca) wrote:
> * David Miller (davem@...emloft.net) wrote:
[...]
> > We can't wholesale to atomic_t because we do this on variables of
> > all sizes, not just 32-bit ones.
> > 
> > We do them on pointers in the networking for example.
> 
> We have atomic_long_t for this, but yeah, it would kind of suck to have
> to create
> 
> union {
> 	atomic_long_t atomic;
> 	void *ptr;
> }

Actually, using a union for this is probably one of the worse idea I've
had recently. Just casting the pointer to unsigned long and vice-versa,
using atomic_long_*() ops would do the trick. But let's wait and see if
it's really needed.

Thanks,

Mathieu

> 
> all around the place. Let's see if we can get to know which PowerPC
> processor family all this fuss is about, and where this rumour
> originates from.
> 
> Thanks,
> 
> Mathieu
> 
> 
> -- 
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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