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SubjectRe: [PATCH 04/40] xen: document Xen is using an unused bit for the pagetables
On 06/28/2012 08:55 AM, Andrea Arcangeli wrote:
> Xen has taken over the last reserved bit available for the pagetables
> which is set through ioremap, this documents it and makes the code
> more readable.
>
> Signed-off-by: Andrea Arcangeli<aarcange@redhat.com>
> ---
> arch/x86/include/asm/pgtable_types.h | 11 +++++++++--
> 1 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
> index 013286a..b74cac9 100644
> --- a/arch/x86/include/asm/pgtable_types.h
> +++ b/arch/x86/include/asm/pgtable_types.h
> @@ -17,7 +17,7 @@
> #define _PAGE_BIT_PAT 7 /* on 4KB pages */
> #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
> #define _PAGE_BIT_UNUSED1 9 /* available for programmer */
> -#define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
> +#define _PAGE_BIT_UNUSED2 10

Considering that Xen is using it, it is not really
unused, is it?

Not that I can think of a better name, considering
you are using this bit for something else at the PMD
level...

--
All rights reversed


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