Re: [Lse-tech] [PATCH] Nonlinear kernel virtual to physical mapping for uml

[Martin J. B. <Mar...@us...>]

>   - The unit of physical contiguity is called a 'section'.  The size of a
>     section is defined by SECTION_SHIFT.  
>
> ...
>
> +#define SECTION_SHIFT 20 /* 1 meg sections */

The buddy allocator assumes that it can return phys contig sections.
To avoid breaking this assumption, doesn't 2^SECTION_SHIFT have to
be >= (2^MAX_ORDER)*PAGE_SIZE? From our previous discussion, I thought
we'd said that your sections have to be at least that big ....
Or am I confused?

M.