[patch] mm: writeback: document bdi_min_ratio

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Looks like someone got distracted after adding the comment characters.

Signed-off-by: Johannes Weiner <jweiner@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
---
 mm/page-writeback.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0e309cd..793e987 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -305,7 +305,9 @@ static unsigned long task_min_dirty_limit(unsigned long bdi_dirty)
 }
 
 /*
- *
+ * bdi_min_ratio keeps the sum of the minimum dirty shares of all
+ * registered backing devices, which, for obvious reasons, can not
+ * exceed 100%.
  */
 static unsigned int bdi_min_ratio;
 
-- 
1.7.6

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