Subject: Re: [PATCH] udev enhancements to use kernel event queue
From: Robert Love <rml@tech9.net>
To: Paul Mackerras <paulus@samba.org>
Cc: Patrick Mochel <mochel@osdl.org>, Greg KH <greg@kroah.com>,
       Andrew Morton <akpm@digeo.com>, sdake@mvista.com,
       linux-kernel@vger.kernel.org
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Date: 12 Jun 2003 16:50:16 -0700
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On Thu, 2003-06-12 at 16:40, Paul Mackerras wrote:

> BZZZT.  If another CPU is also doing atomic_inc_and_read you could end
> up with both calls returning the same value.

That is what I thought. Damn.

> You can't do atomic_inc_and_read on 386.  You can on cpus that have
> cmpxchg (e.g. later x86).  You can also on machines with load-locked
> and store-conditional instructions (alpha, ppc, probably most other
> RISCs).

So this is doable on everything but old i386 chips... hrm.

	Robert Love

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