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

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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>
This commit is contained in:
Pallipadi, Venkatesh 2009-03-13 16:35:44 -07:00 committed by Ingo Molnar
parent 4bb9c5c021
commit 895791dac6
2 changed files with 5 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/linux/mm.h
View File

@ -98,12 +98,13 @@ extern unsigned int kobjsize(const void *objp);
#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ #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_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_ALWAYSDUMP 0x04000000 /* Always include in core dumps */
#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) */ #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 */ #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
@ -126,17 +127,6 @@ extern unsigned int kobjsize(const void *objp);
*/ */
#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) #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 * mapping from the currently active vm_flags protection bits (the
* low four bits) to a page protection mask.. * 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) 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) static inline int is_pfn_mapping(struct vm_area_struct *vma)

4
mm/memory.c
View File

@ -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) { if (addr == vma->vm_start && end == vma->vm_end) {
vma->vm_pgoff = pfn; 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)) } else if (is_cow_mapping(vma->vm_flags))
return -EINVAL; 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 * needed from higher level routine calling unmap_vmas
*/ */
vma->vm_flags &= ~(VM_IO | VM_RESERVED | VM_PFNMAP); 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; return -EINVAL;
} }