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Commit aba46c50 authored Jul 08, 2008 by Dave Kleikamp Committed by Benjamin Herrenschmidt Jul 09, 2008

powerpc/mm: Define flags for Strong Access Ordering



This patch defines:

- PROT_SAO, which is passed into mmap() and mprotect() in the prot field
- VM_SAO in vma->vm_flags, and
- _PAGE_SAO, the combination of WIMG bits in the pte that enables strong
access ordering for the page.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent b845f313

include/asm-powerpc/mman.h

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -10,6 +10,8 @@
	* 2 of the License, or (at your option) any later version.		* 2 of the License, or (at your option) any later version.
	*/		*/

			#define PROT_SAO 0x10 /* Strong Access Ordering */

	#define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */		#define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */
	#define MAP_NORESERVE 0x40 /* don't reserve swap pages */		#define MAP_NORESERVE 0x40 /* don't reserve swap pages */
	#define MAP_LOCKED 0x80		#define MAP_LOCKED 0x80

include/asm-powerpc/pgtable-ppc64.h

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -93,6 +93,9 @@
	#define _PAGE_RW 0x0200 /* software: user write access allowed */		#define _PAGE_RW 0x0200 /* software: user write access allowed */
	#define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */		#define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */

			/* Strong Access Ordering */
			#define _PAGE_SAO (_PAGE_WRITETHRU \| _PAGE_NO_CACHE \| _PAGE_COHERENT)

	#define _PAGE_BASE (_PAGE_PRESENT \| _PAGE_ACCESSED \| _PAGE_COHERENT)		#define _PAGE_BASE (_PAGE_PRESENT \| _PAGE_ACCESSED \| _PAGE_COHERENT)

	#define _PAGE_WRENABLE (_PAGE_RW \| _PAGE_DIRTY)		#define _PAGE_WRENABLE (_PAGE_RW \| _PAGE_DIRTY)

include/linux/mm.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -108,6 +108,7 @@ extern unsigned int kobjsize(const void *objp);

	#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */		#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
	#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */		#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
			#define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */

	#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */		#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
	#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS		#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS