[PATCH v5 3/9] writeback: convert variables to unsigned

Convert two balance_dirty_pages() page counter variables (nr_reclaimable
and nr_writeback) from 'long' to 'unsigned long'.

These two variables are used to store results from global_page_state().
global_page_state() returns unsigned long and carefully sums per-cpu
counters explicitly avoiding returning a negative value.

Signed-off-by: Greg Thelen <redacted>
---
Changelog since v4:
- Created this patch for clarity.  Previously this patch was integrated within
  the "writeback: create dirty_info structure" patch.

 mm/page-writeback.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 2cb01f6..4408e54 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c

@@ -478,8 +478,10 @@ unsigned long bdi_dirty_limit(struct backing_dev_info *bdi, unsigned long dirty)
 static void balance_dirty_pages(struct address_space *mapping,
 				unsigned long write_chunk)
 {
-	long nr_reclaimable, bdi_nr_reclaimable;
-	long nr_writeback, bdi_nr_writeback;
+	unsigned long nr_reclaimable;
+	long bdi_nr_reclaimable;
+	unsigned long nr_writeback;
+	long bdi_nr_writeback;
 	unsigned long background_thresh;
 	unsigned long dirty_thresh;
 	unsigned long bdi_thresh;

-- 
1.7.3.1

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