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| author | Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> | 2009-03-13 16:35:44 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-14 09:47:44 +0100 |
| commit | 895791dac6946d535991edd11341046f8e85ea77 (patch) | |
| tree | 4ad589460b0d7c039f5d5a42666c6bd572255049 /include/linux/mm.h | |
| parent | 4bb9c5c02153dfc89a6c73a6f32091413805ad7d (diff) | |
| download | lwn-895791dac6946d535991edd11341046f8e85ea77.tar.gz lwn-895791dac6946d535991edd11341046f8e85ea77.zip | |
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>
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 3daa05feed9f..b1ea37fc7a24 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) |