blk-throttle: Fix that bps of child could exceed bps limited in parent

[linux-2.6-microblaze.git] / mm / page_table_check.c

diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index e206274..433dbce 100644 (file)
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -53,7 +53,7 @@ static struct page_table_check *get_page_table_check(struct page_ext *page_ext)
 }
 
 /*
- * An enty is removed from the page table, decrement the counters for that page
+ * An entry is removed from the page table, decrement the counters for that page
  * verify that it is of correct type and counters do not become negative.
  */
 static void page_table_check_clear(struct mm_struct *mm, unsigned long addr,
@@ -68,7 +68,7 @@ static void page_table_check_clear(struct mm_struct *mm, unsigned long addr,
                return;
 
        page = pfn_to_page(pfn);
-       page_ext = lookup_page_ext(page);
+       page_ext = page_ext_get(page);
        anon = PageAnon(page);
 
        for (i = 0; i < pgcnt; i++) {
@@ -83,10 +83,11 @@ static void page_table_check_clear(struct mm_struct *mm, unsigned long addr,
                }
                page_ext = page_ext_next(page_ext);
        }
+       page_ext_put(page_ext);
 }
 
 /*
- * A new enty is added to the page table, increment the counters for that page
+ * A new entry is added to the page table, increment the counters for that page
  * verify that it is of correct type and is not being mapped with a different
  * type to a different process.
  */
@@ -103,7 +104,7 @@ static void page_table_check_set(struct mm_struct *mm, unsigned long addr,
                return;
 
        page = pfn_to_page(pfn);
-       page_ext = lookup_page_ext(page);
+       page_ext = page_ext_get(page);
        anon = PageAnon(page);
 
        for (i = 0; i < pgcnt; i++) {
@@ -118,6 +119,7 @@ static void page_table_check_set(struct mm_struct *mm, unsigned long addr,
                }
                page_ext = page_ext_next(page_ext);
        }
+       page_ext_put(page_ext);
 }
 
 /*
@@ -126,9 +128,10 @@ static void page_table_check_set(struct mm_struct *mm, unsigned long addr,
  */
 void __page_table_check_zero(struct page *page, unsigned int order)
 {
-       struct page_ext *page_ext = lookup_page_ext(page);
+       struct page_ext *page_ext;
        unsigned long i;
 
+       page_ext = page_ext_get(page);
        BUG_ON(!page_ext);
        for (i = 0; i < (1ul << order); i++) {
                struct page_table_check *ptc = get_page_table_check(page_ext);
@@ -137,6 +140,7 @@ void __page_table_check_zero(struct page *page, unsigned int order)
                BUG_ON(atomic_read(&ptc->file_map_count));
                page_ext = page_ext_next(page_ext);
        }
+       page_ext_put(page_ext);
 }
 
 void __page_table_check_pte_clear(struct mm_struct *mm, unsigned long addr,