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-rw-r--r--mm/page-writeback.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 650846b61584..9c31199dae9a 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -251,7 +251,9 @@ static void bdi_writeout_fraction(struct backing_dev_info *bdi,
}
/*
- *
+ * 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;