tipc: fix integer as NULL pointer sparse warnings in tipc

[sfrench/cifs-2.6.git] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 3d3848fa6324ee30c8bfa4f39ac867808af84627..5e00f1772c20fc6d9e4e70a087800e93b3ae3df2 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -68,6 +68,12 @@ static inline long sync_writeback_pages(void)
  */
 int dirty_background_ratio = 5;
 
+/*
+ * free highmem will not be subtracted from the total free memory
+ * for calculating free ratios if vm_highmem_is_dirtyable is true
+ */
+int vm_highmem_is_dirtyable;
+
 /*
  * The generator of dirty data starts writeback at this percentage
  */
@@ -219,7 +225,7 @@ static inline void task_dirties_fraction(struct task_struct *tsk,
  *
  *   dirty -= (dirty/8) * p_{t}
  */
-void task_dirty_limit(struct task_struct *tsk, long *pdirty)
+static void task_dirty_limit(struct task_struct *tsk, long *pdirty)
 {
        long numerator, denominator;
        long dirty = *pdirty;
@@ -287,7 +293,10 @@ static unsigned long determine_dirtyable_memory(void)
        x = global_page_state(NR_FREE_PAGES)
                + global_page_state(NR_INACTIVE)
                + global_page_state(NR_ACTIVE);
-       x -= highmem_dirtyable_memory(x);
+
+       if (!vm_highmem_is_dirtyable)
+               x -= highmem_dirtyable_memory(x);
+
        return x + 1;   /* Ensure that we never return 0 */
 }
 
@@ -558,6 +567,7 @@ static void background_writeout(unsigned long _min_pages)
                        global_page_state(NR_UNSTABLE_NFS) < background_thresh
                                && min_pages <= 0)
                        break;
+               wbc.more_io = 0;
                wbc.encountered_congestion = 0;
                wbc.nr_to_write = MAX_WRITEBACK_PAGES;
                wbc.pages_skipped = 0;
@@ -565,8 +575,9 @@ static void background_writeout(unsigned long _min_pages)
                min_pages -= MAX_WRITEBACK_PAGES - wbc.nr_to_write;
                if (wbc.nr_to_write > 0 || wbc.pages_skipped > 0) {
                        /* Wrote less than expected */
-                       congestion_wait(WRITE, HZ/10);
-                       if (!wbc.encountered_congestion)
+                       if (wbc.encountered_congestion || wbc.more_io)
+                               congestion_wait(WRITE, HZ/10);
+                       else
                                break;
                }
        }
@@ -631,11 +642,12 @@ static void wb_kupdate(unsigned long arg)
                        global_page_state(NR_UNSTABLE_NFS) +
                        (inodes_stat.nr_inodes - inodes_stat.nr_unused);
        while (nr_to_write > 0) {
+               wbc.more_io = 0;
                wbc.encountered_congestion = 0;
                wbc.nr_to_write = MAX_WRITEBACK_PAGES;
                writeback_inodes(&wbc);
                if (wbc.nr_to_write > 0) {
-                       if (wbc.encountered_congestion)
+                       if (wbc.encountered_congestion || wbc.more_io)
                                congestion_wait(WRITE, HZ/10);
                        else
                                break;  /* All the old data is written */
@@ -1064,7 +1076,7 @@ static int __set_page_dirty(struct page *page)
        return 0;
 }
 
-int fastcall set_page_dirty(struct page *page)
+int set_page_dirty(struct page *page)
 {
        int ret = __set_page_dirty(page);
        if (ret)