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Subject[tip:x86/urgent] VM, x86, PAT: add a new vm flag to track full pfnmap at mmap
Commit-ID:  895791dac6946d535991edd11341046f8e85ea77
Gitweb: http://git.kernel.org/tip/895791dac6946d535991edd11341046f8e85ea77
Author: Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com>
AuthorDate: Fri, 13 Mar 2009 16:35:44 -0700
Commit: Ingo Molnar <mingo@elte.hu>
CommitDate: Sat, 14 Mar 2009 09:47:44 +0100

VM, x86, PAT: add a new vm flag to track full pfnmap at mmap

Impact: cleanup

Add a new vm flag VM_PFN_AT_MMAP to identify a PFNMAP that is
fully mapped with remap_pfn_range. Patch removes the overloading
of VM_INSERTPAGE from the earlier patch.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Nick Piggin <npiggin@suse.de>
LKML-Reference: <20090313233543.GA19909@linux-os.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
include/linux/mm.h | 16 +++-------------
mm/memory.c | 4 ++--
2 files changed, 5 insertions(+), 15 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3daa05f..b1ea37f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -98,12 +98,13 @@ extern unsigned int kobjsize(const void *objp);
#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
-#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it. Refer note in VM_PFNMAP_AT_MMAP below */
+#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
#define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */

#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */
#define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */
+#define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */

#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
@@ -127,17 +128,6 @@ extern unsigned int kobjsize(const void *objp);
#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)

/*
- * pfnmap vmas that are fully mapped at mmap time (not mapped on fault).
- * Used by x86 PAT to identify such PFNMAP mappings and optimize their handling.
- * Note VM_INSERTPAGE flag is overloaded here. i.e,
- * VM_INSERTPAGE && !VM_PFNMAP implies
- * The vma has had "vm_insert_page()" done on it
- * VM_INSERTPAGE && VM_PFNMAP implies
- * The vma is PFNMAP with full mapping at mmap time
- */
-#define VM_PFNMAP_AT_MMAP (VM_INSERTPAGE | VM_PFNMAP)
-
-/*
* mapping from the currently active vm_flags protection bits (the
* low four bits) to a page protection mask..
*/
@@ -156,7 +146,7 @@ extern pgprot_t protection_map[16];
*/
static inline int is_linear_pfn_mapping(struct vm_area_struct *vma)
{
- return ((vma->vm_flags & VM_PFNMAP_AT_MMAP) == VM_PFNMAP_AT_MMAP);
+ return (vma->vm_flags & VM_PFN_AT_MMAP);
}

static inline int is_pfn_mapping(struct vm_area_struct *vma)
diff --git a/mm/memory.c b/mm/memory.c
index d7df5ba..2032ad2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1667,7 +1667,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
*/
if (addr == vma->vm_start && end == vma->vm_end) {
vma->vm_pgoff = pfn;
- vma->vm_flags |= VM_PFNMAP_AT_MMAP;
+ vma->vm_flags |= VM_PFN_AT_MMAP;
} else if (is_cow_mapping(vma->vm_flags))
return -EINVAL;

@@ -1680,7 +1680,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
* needed from higher level routine calling unmap_vmas
*/
vma->vm_flags &= ~(VM_IO | VM_RESERVED | VM_PFNMAP);
- vma->vm_flags &= ~VM_PFNMAP_AT_MMAP;
+ vma->vm_flags &= ~VM_PFN_AT_MMAP;
return -EINVAL;
}


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