#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;
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)))
}
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) {
}
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);
}
+static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud,
+ unsigned long addr, unsigned long end,
+ unsigned char *vec)
+{
+ unsigned long next;
+ pmd_t *pmd;
+
+ pmd = pmd_offset(pud, addr);
+ do {
+ next = pmd_addr_end(addr, end);
+ if (pmd_none_or_clear_bad(pmd))
+ mincore_unmapped_range(vma, addr, next, vec);
+ else
+ mincore_pte_range(vma, pmd, addr, next, vec);
+ vec += (next - addr) >> PAGE_SHIFT;
+ } while (pmd++, addr = next, addr != end);
+}
+
+static void mincore_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
+ unsigned long addr, unsigned long end,
+ unsigned char *vec)
+{
+ unsigned long next;
+ pud_t *pud;
+
+ pud = pud_offset(pgd, addr);
+ do {
+ next = pud_addr_end(addr, end);
+ if (pud_none_or_clear_bad(pud))
+ mincore_unmapped_range(vma, addr, next, vec);
+ else
+ mincore_pmd_range(vma, pud, addr, next, vec);
+ vec += (next - addr) >> PAGE_SHIFT;
+ } while (pud++, addr = next, addr != end);
+}
+
+static void mincore_page_range(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long end,
+ unsigned char *vec)
+{
+ unsigned long next;
+ pgd_t *pgd;
+
+ pgd = pgd_offset(vma->vm_mm, addr);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (pgd_none_or_clear_bad(pgd))
+ mincore_unmapped_range(vma, addr, next, vec);
+ else
+ mincore_pud_range(vma, pgd, addr, next, vec);
+ vec += (next - addr) >> PAGE_SHIFT;
+ } while (pgd++, addr = next, addr != end);
+}
+
/*
* Do a chunk of "sys_mincore()". We've already checked
* all the arguments, we hold the mmap semaphore: we should
*/
static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *vec)
{
- 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)));
-
- pgd = pgd_offset(vma->vm_mm, addr);
- if (pgd_none_or_clear_bad(pgd))
- goto none_mapped;
- pud = pud_offset(pgd, addr);
- if (pud_none_or_clear_bad(pud))
- goto none_mapped;
- pmd = pmd_offset(pud, addr);
- if (pmd_none_or_clear_bad(pmd))
- goto none_mapped;
+ end = pmd_addr_end(addr, end);
- mincore_pte_range(vma, pmd, addr, nr, vec);
- return nr;
+ if (is_vm_hugetlb_page(vma))
+ mincore_hugetlb_page_range(vma, addr, end, vec);
+ else
+ mincore_page_range(vma, addr, end, vec);
-none_mapped:
- mincore_unmapped_range(vma, addr, nr, vec);
- return nr;
+ return (end - addr) >> PAGE_SHIFT;
}
/*