Re: [PATCH 04/40] xen: document Xen is using an unused bit for thepagetables
From: Rik van Riel
Date: Fri Jun 29 2012 - 10:17:08 EST
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@xxxxxxxxxx>
---
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...
--
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