Date: Wed, 11 Jan 2012 17:40:31 -0500 From: John Baldwin <jhb@freebsd.org> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: bus dma: a flag/quirk for page zero Message-ID: <201201111740.31125.jhb@freebsd.org> In-Reply-To: <4F0DE97F.60208@FreeBSD.org> References: <4F0C9D14.60705@FreeBSD.org> <4F0DC476.8050509@FreeBSD.org> <4F0DE97F.60208@FreeBSD.org>
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On Wednesday, January 11, 2012 2:56:47 pm Andriy Gapon wrote: > on 11/01/2012 19:18 Andriy Gapon said the following: > > Actually, I think that on x86 we don't have to do anything special for any memory > > allocations that we do, including the bounce pages, as the page zero is excluded > > from phys_avail and is not available for normal use. > > After some additional thinking there is probably no reason to take advantage of > this fact. First, it would increase differences with other platforms. Second, > it would add a hidden dependency. So it's better to be explicit here. Agreed. -- John Baldwin
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