Re: [Xen-devel] bitopts functions overflowing page boundarys

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 28 May 2005, at 05:43, Scott Parish wrote:

> u.inuse.type_info is at the end of the pfn_info structure, and is
> u32 for both x86_32 and x86_64--in this location it can also be the
> last 32 bits of a page.
>
> several functions use bitopts.h functions to manipulate this member, 
> and
> on x86_64 these functions use u64 instructions, which will overflow the
> page boundary, and possibly the end of memory as we see here:
You really see this in practise? I'm very surprised. The memory map 
would have to be just big enough that the last pfn_info structure falls 
at the end of an aligned 2MB boundary. If you reduce max_page by 1, 
does the problem disappear?
 -- Keir


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