linux-kernel - [patch 7/9] mm: make global_dirtyable_memory() available to other mm code

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Message-Id: <1376767883-4411-8-git-send-email-hannes@cmpxchg.org>
Date:	Sat, 17 Aug 2013 15:31:21 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Metin Doslu <metin@...usdata.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch 7/9] mm: make global_dirtyable_memory() available to other mm code

Subsequent patches need a rough estimate of memory available for page
cache.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 include/linux/writeback.h | 1 +
 mm/page-writeback.c       | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 4e198ca..4c26df7 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -154,6 +154,7 @@ struct ctl_table;
 int dirty_writeback_centisecs_handler(struct ctl_table *, int,
 				      void __user *, size_t *, loff_t *);
 
+unsigned long global_dirtyable_memory(void);
 void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty);
 unsigned long bdi_dirty_limit(struct backing_dev_info *bdi,
 			       unsigned long dirty);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index d374b29..60376ad 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -231,7 +231,7 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
  * Returns the global number of pages potentially available for dirty
  * page cache.  This is the base value for the global dirty limits.
  */
-static unsigned long global_dirtyable_memory(void)
+unsigned long global_dirtyable_memory(void)
 {
 	unsigned long x;
 
-- 
1.8.3.2

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