[PATCH] mm: rss = file_rss + anon_rss

[deliverable/linux.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 0184f510aacefd5cdce18b18a2d2f91008e255db..296e0bbf78360f673c4e95283ad72be118b88952 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -398,17 +398,16 @@ void free_swap_and_cache(swp_entry_t entry)
 }
 
 /*
- * Always set the resulting pte to be nowrite (the same as COW pages
- * after one process has exited).  We don't know just how many PTEs will
- * share this swap entry, so be cautious and let do_wp_page work out
- * what to do if a write is requested later.
+ * No need to decide whether this PTE shares the swap entry with others,
+ * just let do_wp_page work it out if a write is requested later - to
+ * force COW, vm_page_prot omits write permission from any private vma.
  *
  * vma->vm_mm->page_table_lock is held.
  */
 static void unuse_pte(struct vm_area_struct *vma, pte_t *pte,
                unsigned long addr, swp_entry_t entry, struct page *page)
 {
-       inc_mm_counter(vma->vm_mm, rss);
+       inc_mm_counter(vma->vm_mm, anon_rss);
        get_page(page);
        set_pte_at(vma->vm_mm, addr, pte,
                   pte_mkold(mk_pte(page, vma->vm_page_prot)));
@@ -1381,6 +1380,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
                error = bd_claim(bdev, sys_swapon);
                if (error < 0) {
                        bdev = NULL;
+                       error = -EINVAL;
                        goto bad_swap;
                }
                p->old_block_size = block_size(bdev);