| Date | Fri, 29 Jun 2012 10:16:12 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 04/40] xen: document Xen is using an unused bit for the pagetables |
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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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