From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: [PATCH v3 03/13] xen: introduce cpumask_from_bitmap
Date: Thu, 25 Apr 2013 15:26:24 +0100
Message-ID: <CD9EFBA0.22F8D%keir.xen@gmail.com>
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To: Ian Campbell <Ian.Campbell@citrix.com>, Jan Beulich <JBeulich@suse.com>
Cc: Julien Grall <julien.grall@citrix.com>, "Tim (Xen.org)" <tim@xen.org>, xen-devel <xen-devel@lists.xen.org>, "Keir (Xen.org)" <keir@xen.org>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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On 25/04/2013 11:01, "Ian Campbell" <Ian.Campbell@citrix.com> wrote:

>> And most importantly: Why? This isn't an operation that should
>> commonly be done, and hence having a utility function for this
>> seems to invite for abuse rather than really help.
> 
> I suggested it, we are emulating an instruction which provides a bitmap
> of the CPUs to operate on. It seemed nicer to me to have a helper rather
> than to open-code accesses under the hood of the cpumask interface.

Emulating a guest instruction? And it really wants to act on sets of real
physical cpus (hence cpumask_t)?

 -- Keir