linux-kernel - Re: [PATCH 23/25] [PATCH] paravirt hooks for arch initialization

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Date:	Fri, 10 Aug 2007 13:30:52 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Glauber de Oliveira Costa <gcosta@...hat.com>
CC:	ak@...e.de, Glauber de Oliveira Costa <glommer@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, lguest@...abs.org,
	linux-kernel@...r.kernel.org, chrisw@...s-sol.org,
	anthony@...emonkey.ws, Steven@...p2.linux-foundation.org,
	akpm@...ux-foundation.org,
	virtualization@...ts.linux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 23/25] [PATCH] paravirt hooks for arch initialization

Glauber de Oliveira Costa wrote:
> Indeed, as the EBDA_ADDR_POINTER is not aligned, this may work even
> better.
>
> It seems to me safe to assume that if we read zero on that line:
>
> ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER);
>
> We could just do ebda_size = 0 and go home happy, skipping the rest of
> the process.

Sure, but it should use probe_kernel_addr as well, just so that it will
be robust against having that page unmapped too.

    J
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