From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [RFC PATCH V3 05/22] Change MAX_EVTCHNS macro to
 max_evtchns inline function
Date: Thu, 28 Feb 2013 11:58:00 +0000
Message-ID: <512F4648.3020800@citrix.com>
References: <1361975655-22295-1-git-send-email-wei.liu2@citrix.com>
	<1361975655-22295-6-git-send-email-wei.liu2@citrix.com>
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To: Wei Liu <wei.liu2@citrix.com>
Cc: "Keir (Xen.org)" <keir@xen.org>, Ian Campbell <Ian.Campbell@citrix.com>, "jbeulich@suse.com" <jbeulich@suse.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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On 27/02/13 14:33, Wei Liu wrote:
> The calculation of max event channels depends on the actual ABI in use. Try to
> avoid gcc-ism macro.
[...]
> +static inline unsigned int max_evtchns(struct domain *d)
> +{
> +    return BITS_PER_EVTCHN_WORD(d) * BITS_PER_EVTCHN_WORD(d);
> +}

This value doesn't change over the life of the domain. Calculate it once
and save it in a new d->max_evtchns field?

David