Re: [Xen-devel] [PATCH v2 9/9] xen: support RAM at addresses 0 and 4096

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.09.13 at 13:40, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> --- a/xen/common/page_alloc.c
> +++ b/xen/common/page_alloc.c
> @@ -257,11 +257,11 @@ unsigned long __init alloc_boot_pages(
>   */
>  
>  #define MEMZONE_XEN 0
> -#define NR_ZONES    (PADDR_BITS - PAGE_SHIFT)
> +#define NR_ZONES    (PADDR_BITS - PAGE_SHIFT + 1)
>  
> -#define bits_to_zone(b) (((b) < (PAGE_SHIFT + 1)) ? 0 : ((b) - PAGE_SHIFT - 
> 1))
> +#define bits_to_zone(b) (((b) < (PAGE_SHIFT + 1)) ? 1 : ((b) - PAGE_SHIFT))
>  #define page_to_zone(pg) (is_xen_heap_page(pg) ? MEMZONE_XEN :  \
> -                          (fls(page_to_mfn(pg)) - 1))
> +                          (fls(page_to_mfn(pg)) ? : 1))

So this puts both $subject pages into zone 1. If that's intended,
and you verified that it's consistent (namely in that zone 1 now
will have twice as many pages as one would expect), then I'm
certainly fine with the change as is.

Jan


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