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authorJohannes Weiner <hannes@cmpxchg.org>2010-05-24 21:32:11 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 15:06:58 (GMT)
commit25ef0e50cca790370ad7838e3ad74db6a6a2d829 (patch)
tree9fef482df352beaeeb0ae1c6a176448cf795d045 /mm/mincore.c
parentf488401076c5570130c018e573f450a9a6c43365 (diff)
mincore: pass ranges as start,end address pairs
Instead of passing a start address and a number of pages into the helper functions, convert them to use a start and an end address. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mincore.c')
-rw-r--r--mm/mincore.c57
1 files changed, 27 insertions, 30 deletions
diff --git a/mm/mincore.c b/mm/mincore.c
index a0c4c10..211604a 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -20,14 +20,12 @@
#include <asm/pgtable.h>
static void mincore_hugetlb_page_range(struct vm_area_struct *vma,
- unsigned long addr, unsigned long nr,
+ unsigned long addr, unsigned long end,
unsigned char *vec)
{
#ifdef CONFIG_HUGETLB_PAGE
struct hstate *h;
- int i;
- i = 0;
h = hstate_vma(vma);
while (1) {
unsigned char present;
@@ -40,10 +38,10 @@ static void mincore_hugetlb_page_range(struct vm_area_struct *vma,
addr & huge_page_mask(h));
present = ptep && !huge_pte_none(huge_ptep_get(ptep));
while (1) {
- vec[i++] = present;
+ *vec = present;
+ vec++;
addr += PAGE_SIZE;
- /* reach buffer limit */
- if (i == nr)
+ if (addr == end)
return;
/* check hugepage border */
if (!(addr & ~huge_page_mask(h)))
@@ -86,9 +84,10 @@ static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
}
static void mincore_unmapped_range(struct vm_area_struct *vma,
- unsigned long addr, unsigned long nr,
+ unsigned long addr, unsigned long end,
unsigned char *vec)
{
+ unsigned long nr = (end - addr) >> PAGE_SHIFT;
int i;
if (vma->vm_file) {
@@ -104,42 +103,44 @@ static void mincore_unmapped_range(struct vm_area_struct *vma,
}
static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long nr,
+ unsigned long addr, unsigned long end,
unsigned char *vec)
{
+ unsigned long next;
spinlock_t *ptl;
pte_t *ptep;
- int i;
ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
- for (i = 0; i < nr; i++, ptep++, addr += PAGE_SIZE) {
+ do {
pte_t pte = *ptep;
pgoff_t pgoff;
+ next = addr + PAGE_SIZE;
if (pte_none(pte))
- mincore_unmapped_range(vma, addr, 1, vec);
+ mincore_unmapped_range(vma, addr, next, vec);
else if (pte_present(pte))
- vec[i] = 1;
+ *vec = 1;
else if (pte_file(pte)) {
pgoff = pte_to_pgoff(pte);
- vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
+ *vec = mincore_page(vma->vm_file->f_mapping, pgoff);
} else { /* pte is a swap entry */
swp_entry_t entry = pte_to_swp_entry(pte);
if (is_migration_entry(entry)) {
/* migration entries are always uptodate */
- vec[i] = 1;
+ *vec = 1;
} else {
#ifdef CONFIG_SWAP
pgoff = entry.val;
- vec[i] = mincore_page(&swapper_space, pgoff);
+ *vec = mincore_page(&swapper_space, pgoff);
#else
WARN_ON(1);
- vec[i] = 1;
+ *vec = 1;
#endif
}
}
- }
+ vec++;
+ } while (ptep++, addr = next, addr != end);
pte_unmap_unlock(ptep - 1, ptl);
}
@@ -153,25 +154,21 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
- unsigned long nr;
struct vm_area_struct *vma;
+ unsigned long end;
vma = find_vma(current->mm, addr);
if (!vma || addr < vma->vm_start)
return -ENOMEM;
- nr = min(pages, (vma->vm_end - addr) >> PAGE_SHIFT);
+ end = min(vma->vm_end, addr + (pages << PAGE_SHIFT));
if (is_vm_hugetlb_page(vma)) {
- mincore_hugetlb_page_range(vma, addr, nr, vec);
- return nr;
+ mincore_hugetlb_page_range(vma, addr, end, vec);
+ return (end - addr) >> PAGE_SHIFT;
}
- /*
- * Calculate how many pages there are left in the last level of the
- * PTE array for our address.
- */
- nr = min(nr, PTRS_PER_PTE - ((addr >> PAGE_SHIFT) & (PTRS_PER_PTE-1)));
+ end = pmd_addr_end(addr, end);
pgd = pgd_offset(vma->vm_mm, addr);
if (pgd_none_or_clear_bad(pgd))
@@ -183,12 +180,12 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
if (pmd_none_or_clear_bad(pmd))
goto none_mapped;
- mincore_pte_range(vma, pmd, addr, nr, vec);
- return nr;
+ mincore_pte_range(vma, pmd, addr, end, vec);
+ return (end - addr) >> PAGE_SHIFT;
none_mapped:
- mincore_unmapped_range(vma, addr, nr, vec);
- return nr;
+ mincore_unmapped_range(vma, addr, end, vec);
+ return (end - addr) >> PAGE_SHIFT;
}
/*

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