Re: [PATCH 4/9] KVM: define kvm_bad_pfn statically

[Paul Mackerras]

On Thu, Aug 02, 2012 at 10:15:27AM -0300, Marcelo Tosatti wrote:

> Remind me what is the guarantee that -Exxx does not clash with
> a valid pfn number?

A pfn number is an address >> PAGE_SHIFT, so it will have the top 12
(at least) bits clear, whereas -Exxx will have the top bit set.

Paul.
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