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x86: PAT: add follow_pfnmp_pte routine to help tracking pfnmap pages - v3

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Impact: New currently unused interface.

Add a generic interface to follow pfn in a pfnmap vma range. This is used by
one of the subsequent x86 PAT related patch to keep track of memory types
for vma regions across vma copy and free.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
venkatesh.pallipadi@intel.com 2008-12-18 11:41:28 -08:00 • committed by H. Peter Anvin
parent 3c8bb73ace
commit e121e41844
2 changed files with 46 additions and 0 deletions
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3
include/linux/mm.h
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@ -1223,6 +1223,9 @@ struct page *follow_page(struct vm_area_struct *, unsigned long address,
#define FOLL_GET 0x04 /* do get_page on page */
#define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */
int follow_pfnmap_pte(struct vm_area_struct *vma,
unsigned long address, pte_t *ret_ptep);
typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
void *data);
extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,