linux-kernel - Re: [PATCH] romsignature/checksum cleanup

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Message-ID: <45A0C977.4070800@goop.org>
Date:	Sun, 07 Jan 2007 02:20:39 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Rene Herman <rene.herman@...il.com>
CC:	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] romsignature/checksum cleanup

Rene Herman wrote:
> How is it for efficiency? I thought it was for correctness.
> romsignature is using probe_kernel_adress() while all other accesses
> to the ROMs there aren't.
>
> If nothing else, anyone reading that code is likely to ask himself the
> very same question -- why the one, and not the others.

Well, I was wondering about all the uses of __get_user; why not
probe_kernel_address() everywhere?

I think its reasonable to assume that if the signature is mapped and
correct, then everything else is mapped.  That's certainly the case for
Xen, which is why I added it.  If you think this is unclear, then I
think a comment to explain this rather than code changes is the
appropriate fix.

    J
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