pagemap: pass mm into pagewalkers
We need this at least for huge page detection for now, because powerpc
needs the vm_area_struct to be able to determine whether a virtual address
is referring to a huge page (its pmd_huge() doesn't work).
It might also come in handy for some of the other users.
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 0afd238..d5878be 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -3,14 +3,14 @@
#include <linux/sched.h>
static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
- const struct mm_walk *walk, void *private)
+ struct mm_walk *walk)
{
pte_t *pte;
int err = 0;
pte = pte_offset_map(pmd, addr);
for (;;) {
- err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, private);
+ err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
if (err)
break;
addr += PAGE_SIZE;
@@ -24,7 +24,7 @@
}
static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
- const struct mm_walk *walk, void *private)
+ struct mm_walk *walk)
{
pmd_t *pmd;
unsigned long next;
@@ -35,15 +35,15 @@
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd)) {
if (walk->pte_hole)
- err = walk->pte_hole(addr, next, private);
+ err = walk->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pmd_entry)
- err = walk->pmd_entry(pmd, addr, next, private);
+ err = walk->pmd_entry(pmd, addr, next, walk);
if (!err && walk->pte_entry)
- err = walk_pte_range(pmd, addr, next, walk, private);
+ err = walk_pte_range(pmd, addr, next, walk);
if (err)
break;
} while (pmd++, addr = next, addr != end);
@@ -52,7 +52,7 @@
}
static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
- const struct mm_walk *walk, void *private)
+ struct mm_walk *walk)
{
pud_t *pud;
unsigned long next;
@@ -63,15 +63,15 @@
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud)) {
if (walk->pte_hole)
- err = walk->pte_hole(addr, next, private);
+ err = walk->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pud_entry)
- err = walk->pud_entry(pud, addr, next, private);
+ err = walk->pud_entry(pud, addr, next, walk);
if (!err && (walk->pmd_entry || walk->pte_entry))
- err = walk_pmd_range(pud, addr, next, walk, private);
+ err = walk_pmd_range(pud, addr, next, walk);
if (err)
break;
} while (pud++, addr = next, addr != end);
@@ -85,15 +85,15 @@
* @addr: starting address
* @end: ending address
* @walk: set of callbacks to invoke for each level of the tree
- * @private: private data passed to the callback function
*
* Recursively walk the page table for the memory area in a VMA,
* calling supplied callbacks. Callbacks are called in-order (first
* PGD, first PUD, first PMD, first PTE, second PTE... second PMD,
* etc.). If lower-level callbacks are omitted, walking depth is reduced.
*
- * Each callback receives an entry pointer, the start and end of the
- * associated range, and a caller-supplied private data pointer.
+ * Each callback receives an entry pointer and the start and end of the
+ * associated range, and a copy of the original mm_walk for access to
+ * the ->private or ->mm fields.
*
* No locks are taken, but the bottom level iterator will map PTE
* directories from highmem if necessary.
@@ -101,9 +101,8 @@
* If any callback returns a non-zero value, the walk is aborted and
* the return value is propagated back to the caller. Otherwise 0 is returned.
*/
-int walk_page_range(const struct mm_struct *mm,
- unsigned long addr, unsigned long end,
- const struct mm_walk *walk, void *private)
+int walk_page_range(unsigned long addr, unsigned long end,
+ struct mm_walk *walk)
{
pgd_t *pgd;
unsigned long next;
@@ -112,21 +111,24 @@
if (addr >= end)
return err;
- pgd = pgd_offset(mm, addr);
+ if (!walk->mm)
+ return -EINVAL;
+
+ pgd = pgd_offset(walk->mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd)) {
if (walk->pte_hole)
- err = walk->pte_hole(addr, next, private);
+ err = walk->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
if (walk->pgd_entry)
- err = walk->pgd_entry(pgd, addr, next, private);
+ err = walk->pgd_entry(pgd, addr, next, walk);
if (!err &&
(walk->pud_entry || walk->pmd_entry || walk->pte_entry))
- err = walk_pud_range(pgd, addr, next, walk, private);
+ err = walk_pud_range(pgd, addr, next, walk);
if (err)
break;
} while (pgd++, addr = next, addr != end);