Re: [PATCH 04/40] xen: document Xen is using an unused bit for the pagetables
From: Rik van Riel <hidden>
Date: 2012-06-29 14:17:05
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On 06/28/2012 08:55 AM, Andrea Arcangeli wrote:
quoted hunk ↗ jump to hunk
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<redacted> --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>