[patch] Revert "page-writeback.c: subtract min_free_kbytes from dirtyable memory"

[Johannes Weiner <hannes@cmpxchg.org>]

This reverts commit 75f7ad8e043d9383337d917584297f7737154bbf.  It was
the result of a problem observed with a 3.2 kernel and merged in 3.9,
while the issue had been resolved upstream in 3.3 (ab8fabd mm: exclude
reserved pages from dirtyable memory).

The "reserved pages" are a superset of min_free_kbytes, thus this
change is redundant and confusing.  Revert it.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/page-writeback.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 3f0c895..d374b29 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -241,9 +241,6 @@ static unsigned long global_dirtyable_memory(void)
 	if (!vm_highmem_is_dirtyable)
 		x -= highmem_dirtyable_memory(x);
 
-	/* Subtract min_free_kbytes */
-	x -= min_t(unsigned long, x, min_free_kbytes >> (PAGE_SHIFT - 10));
-
 	return x + 1;	/* Ensure that we never return 0 */
 }
 
-- 
1.8.3.2

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