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mincore: cleanups
[pandora-kernel.git]
/
mm
/
mincore.c
diff --git
a/mm/mincore.c
b/mm/mincore.c
index
f77433c
..
1f6574c
100644
(file)
--- a/
mm/mincore.c
+++ b/
mm/mincore.c
@@
-54,7
+54,7
@@
static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
* all the arguments, we hold the mmap semaphore: we should
* just return the amount of info we're asked for.
*/
* all the arguments, we hold the mmap semaphore: we should
* just return the amount of info we're asked for.
*/
-static long do_mincore(unsigned long addr, unsigned
char *vec, unsigned long pages
)
+static long do_mincore(unsigned long addr, unsigned
long pages, unsigned char *vec
)
{
pgd_t *pgd;
pud_t *pud;
{
pgd_t *pgd;
pud_t *pud;
@@
-64,35
+64,29
@@
static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
unsigned long nr;
int i;
pgoff_t pgoff;
unsigned long nr;
int i;
pgoff_t pgoff;
- struct vm_area_struct *vma
= find_vma(current->mm, addr)
;
+ struct vm_area_struct *vma;
- /*
- * find_vma() didn't find anything above us, or we're
- * in an unmapped hole in the address space: ENOMEM.
- */
+ vma = find_vma(current->mm, addr);
if (!vma || addr < vma->vm_start)
return -ENOMEM;
if (!vma || addr < vma->vm_start)
return -ENOMEM;
+ nr = min(pages, (vma->vm_end - addr) >> PAGE_SHIFT);
+
#ifdef CONFIG_HUGETLB_PAGE
if (is_vm_hugetlb_page(vma)) {
struct hstate *h;
#ifdef CONFIG_HUGETLB_PAGE
if (is_vm_hugetlb_page(vma)) {
struct hstate *h;
- unsigned long nr_huge;
- unsigned char present;
i = 0;
i = 0;
- nr = min(pages, (vma->vm_end - addr) >> PAGE_SHIFT);
h = hstate_vma(vma);
h = hstate_vma(vma);
- nr_huge = ((addr + pages * PAGE_SIZE - 1) >> huge_page_shift(h))
- - (addr >> huge_page_shift(h)) + 1;
- nr_huge = min(nr_huge,
- (vma->vm_end - addr) >> huge_page_shift(h));
while (1) {
while (1) {
- /* hugepage always in RAM for now,
- * but generally it needs to be check */
+ unsigned char present;
+ /*
+ * Huge pages are always in RAM for now, but
+ * theoretically it needs to be checked.
+ */
ptep = huge_pte_offset(current->mm,
addr & huge_page_mask(h));
ptep = huge_pte_offset(current->mm,
addr & huge_page_mask(h));
- present = !!(ptep &&
- !huge_pte_none(huge_ptep_get(ptep)));
+ present = ptep && !huge_pte_none(huge_ptep_get(ptep));
while (1) {
vec[i++] = present;
addr += PAGE_SIZE;
while (1) {
vec[i++] = present;
addr += PAGE_SIZE;
@@
-100,8
+94,7
@@
static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
if (i == nr)
return nr;
/* check hugepage border */
if (i == nr)
return nr;
/* check hugepage border */
- if (!((addr & ~huge_page_mask(h))
- >> PAGE_SHIFT))
+ if (!(addr & ~huge_page_mask(h)))
break;
}
}
break;
}
}
@@
-113,17
+106,7
@@
static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
* Calculate how many pages there are left in the last level of the
* PTE array for our address.
*/
* Calculate how many pages there are left in the last level of the
* PTE array for our address.
*/
- nr = PTRS_PER_PTE - ((addr >> PAGE_SHIFT) & (PTRS_PER_PTE-1));
-
- /*
- * Don't overrun this vma
- */
- nr = min(nr, (vma->vm_end - addr) >> PAGE_SHIFT);
-
- /*
- * Don't return more than the caller asked for
- */
- nr = min(nr, pages);
+ 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))
pgd = pgd_offset(vma->vm_mm, addr);
if (pgd_none_or_clear_bad(pgd))
@@
-137,43
+120,38
@@
static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (i = 0; i < nr; i++, ptep++, addr += PAGE_SIZE) {
ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (i = 0; i < nr; i++, ptep++, addr += PAGE_SIZE) {
- unsigned char present;
pte_t pte = *ptep;
pte_t pte = *ptep;
- if (pte_present(pte)) {
- present = 1;
-
- } else if (pte_none(pte)) {
+ if (pte_none(pte)) {
if (vma->vm_file) {
pgoff = linear_page_index(vma, addr);
if (vma->vm_file) {
pgoff = linear_page_index(vma, addr);
-
present
= mincore_page(vma->vm_file->f_mapping,
-
pgoff);
+
vec[i]
= mincore_page(vma->vm_file->f_mapping,
+ pgoff);
} else
} else
- present = 0;
-
- } else if (pte_file(pte)) {
+ vec[i] = 0;
+ } else if (pte_present(pte))
+ vec[i] = 1;
+ else if (pte_file(pte)) {
pgoff = pte_to_pgoff(pte);
pgoff = pte_to_pgoff(pte);
- present = mincore_page(vma->vm_file->f_mapping, pgoff);
-
+ vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
} else { /* pte is a swap entry */
swp_entry_t entry = pte_to_swp_entry(pte);
} 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 */
if (is_migration_entry(entry)) {
/* migration entries are always uptodate */
-
present
= 1;
+
vec[i]
= 1;
} else {
#ifdef CONFIG_SWAP
pgoff = entry.val;
} else {
#ifdef CONFIG_SWAP
pgoff = entry.val;
-
present
= mincore_page(&swapper_space, pgoff);
+
vec[i]
= mincore_page(&swapper_space, pgoff);
#else
WARN_ON(1);
#else
WARN_ON(1);
-
present
= 1;
+
vec[i]
= 1;
#endif
}
}
#endif
}
}
-
- vec[i] = present;
}
}
- pte_unmap_unlock(ptep
-
1, ptl);
+ pte_unmap_unlock(ptep
-
1, ptl);
return nr;
return nr;
@@
-247,7
+225,7
@@
SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len,
* the temporary buffer size.
*/
down_read(¤t->mm->mmap_sem);
* the temporary buffer size.
*/
down_read(¤t->mm->mmap_sem);
- retval = do_mincore(start,
tmp, min(pages, PAGE_SIZE)
);
+ retval = do_mincore(start,
min(pages, PAGE_SIZE), tmp
);
up_read(¤t->mm->mmap_sem);
if (retval <= 0)
up_read(¤t->mm->mmap_sem);
if (retval <= 0)