[PATCH] mm: remove pcp low

[powerpc.git] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index 914d04b..f853c6d 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -225,7 +225,7 @@ vma_address(struct page *page, struct vm_area_struct *vma)
 
 /*
  * At what user virtual address is page expected in vma? checking that the
- * page matches the vma: currently only used by unuse_process, on anon pages.
+ * page matches the vma: currently only used on anon pages, by unuse_vma;
  */
 unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
 {
@@ -234,7 +234,8 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
                    (void *)page->mapping - PAGE_MAPPING_ANON)
                        return -EFAULT;
        } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) {
-               if (vma->vm_file->f_mapping != page->mapping)
+               if (!vma->vm_file ||
+                   vma->vm_file->f_mapping != page->mapping)
                        return -EFAULT;
        } else
                return -EFAULT;
@@ -289,7 +290,7 @@ pte_t *page_check_address(struct page *page, struct mm_struct *mm,
  * repeatedly from either page_referenced_anon or page_referenced_file.
  */
 static int page_referenced_one(struct page *page,
-       struct vm_area_struct *vma, unsigned int *mapcount, int ignore_token)
+       struct vm_area_struct *vma, unsigned int *mapcount)
 {
        struct mm_struct *mm = vma->vm_mm;
        unsigned long address;
@@ -310,7 +311,7 @@ static int page_referenced_one(struct page *page,
 
        /* Pretend the page is referenced if the task has the
           swap token and is in the middle of a page fault. */
-       if (mm != current->mm && !ignore_token && has_swap_token(mm) &&
+       if (mm != current->mm && has_swap_token(mm) &&
                        rwsem_is_locked(&mm->mmap_sem))
                referenced++;
 
@@ -320,7 +321,7 @@ out:
        return referenced;
 }
 
-static int page_referenced_anon(struct page *page, int ignore_token)
+static int page_referenced_anon(struct page *page)
 {
        unsigned int mapcount;
        struct anon_vma *anon_vma;
@@ -333,8 +334,7 @@ static int page_referenced_anon(struct page *page, int ignore_token)
 
        mapcount = page_mapcount(page);
        list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
-               referenced += page_referenced_one(page, vma, &mapcount,
-                                                       ignore_token);
+               referenced += page_referenced_one(page, vma, &mapcount);
                if (!mapcount)
                        break;
        }
@@ -353,7 +353,7 @@ static int page_referenced_anon(struct page *page, int ignore_token)
  *
  * This function is only called from page_referenced for object-based pages.
  */
-static int page_referenced_file(struct page *page, int ignore_token)
+static int page_referenced_file(struct page *page)
 {
        unsigned int mapcount;
        struct address_space *mapping = page->mapping;
@@ -391,8 +391,7 @@ static int page_referenced_file(struct page *page, int ignore_token)
                        referenced++;
                        break;
                }
-               referenced += page_referenced_one(page, vma, &mapcount,
-                                                       ignore_token);
+               referenced += page_referenced_one(page, vma, &mapcount);
                if (!mapcount)
                        break;
        }
@@ -409,13 +408,10 @@ static int page_referenced_file(struct page *page, int ignore_token)
  * Quick test_and_clear_referenced for all mappings to a page,
  * returns the number of ptes which referenced the page.
  */
-int page_referenced(struct page *page, int is_locked, int ignore_token)
+int page_referenced(struct page *page, int is_locked)
 {
        int referenced = 0;
 
-       if (!swap_token_default_timeout)
-               ignore_token = 1;
-
        if (page_test_and_clear_young(page))
                referenced++;
 
@@ -424,15 +420,14 @@ int page_referenced(struct page *page, int is_locked, int ignore_token)
 
        if (page_mapped(page) && page->mapping) {
                if (PageAnon(page))
-                       referenced += page_referenced_anon(page, ignore_token);
+                       referenced += page_referenced_anon(page);
                else if (is_locked)
-                       referenced += page_referenced_file(page, ignore_token);
+                       referenced += page_referenced_file(page);
                else if (TestSetPageLocked(page))
                        referenced++;
                else {
                        if (page->mapping)
-                               referenced += page_referenced_file(page,
-                                                               ignore_token);
+                               referenced += page_referenced_file(page);
                        unlock_page(page);
                }
        }
@@ -529,10 +524,8 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma)
         * If the page is mlock()d, we cannot swap it out.
         * If it's recently referenced (perhaps page_referenced
         * skipped over this mm) then we should reactivate it.
-        *
-        * Pages belonging to VM_RESERVED regions should not happen here.
         */
-       if ((vma->vm_flags & (VM_LOCKED|VM_RESERVED)) ||
+       if ((vma->vm_flags & VM_LOCKED) ||
                        ptep_clear_flush_young(vma, address, pte)) {
                ret = SWAP_FAIL;
                goto out_unmap;
@@ -613,7 +606,6 @@ static void try_to_unmap_cluster(unsigned long cursor,
        struct page *page;
        unsigned long address;
        unsigned long end;
-       unsigned long pfn;
 
        address = (vma->vm_start + cursor) & CLUSTER_MASK;
        end = address + CLUSTER_SIZE;
@@ -642,21 +634,14 @@ static void try_to_unmap_cluster(unsigned long cursor,
        for (; address < end; pte++, address += PAGE_SIZE) {
                if (!pte_present(*pte))
                        continue;
-
-               pfn = pte_pfn(*pte);
-               if (unlikely(!pfn_valid(pfn))) {
-                       print_bad_pte(vma, *pte, address);
-                       continue;
-               }
-
-               page = pfn_to_page(pfn);
-               BUG_ON(PageAnon(page));
+               page = vm_normal_page(vma, address, *pte);
+               BUG_ON(!page || PageAnon(page));
 
                if (ptep_clear_flush_young(vma, address, pte))
                        continue;
 
                /* Nuke the page table entry. */
-               flush_cache_page(vma, address, pfn);
+               flush_cache_page(vma, address, pte_pfn(*pte));
                pteval = ptep_clear_flush(vma, address, pte);
 
                /* If nonlinear, store the file page offset in the pte. */
@@ -727,7 +712,7 @@ static int try_to_unmap_file(struct page *page)
 
        list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
                                                shared.vm_set.list) {
-               if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
+               if (vma->vm_flags & VM_LOCKED)
                        continue;
                cursor = (unsigned long) vma->vm_private_data;
                if (cursor > max_nl_cursor)
@@ -761,7 +746,7 @@ static int try_to_unmap_file(struct page *page)
        do {
                list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
                                                shared.vm_set.list) {
-                       if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
+                       if (vma->vm_flags & VM_LOCKED)
                                continue;
                        cursor = (unsigned long) vma->vm_private_data;
                        while ( cursor < max_nl_cursor &&
@@ -783,11 +768,8 @@ static int try_to_unmap_file(struct page *page)
         * in locked vmas).  Reset cursor on all unreserved nonlinear
         * vmas, now forgetting on which ones it had fallen behind.
         */
-       list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
-                                               shared.vm_set.list) {
-               if (!(vma->vm_flags & VM_RESERVED))
-                       vma->vm_private_data = NULL;
-       }
+       list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.vm_set.list)
+               vma->vm_private_data = NULL;
 out:
        spin_unlock(&mapping->i_mmap_lock);
        return ret;