[RFC PATCH v3 06/14] mm: split off __bdi_set_max_ratio() function

[Stefan Roesch <shr@devkernel.io>]

This splits off the __bdi_set_max_ratio() function from the
bdi_set_max_ratio() function. The __bdi_set_max_ratio() function will
also be called from the bdi_set_max_bytes() function, which will be
introduced in the next patch.

Signed-off-by: Stefan Roesch <shr@devkernel.io>
---
 mm/page-writeback.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0b9dcf5afda2..8b8936603783 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -692,14 +692,10 @@ int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
 	return ret;
 }
 
-int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio)
+static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
 {
 	int ret = 0;
 
-	if (max_ratio > 100)
-		return -EINVAL;
-	max_ratio *= BDI_RATIO_SCALE;
-
 	spin_lock_bh(&bdi_lock);
 	if (bdi->min_ratio > max_ratio) {
 		ret = -EINVAL;
@@ -711,6 +707,14 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio)
 
 	return ret;
 }
+
+int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
+{
+	if (max_ratio > 100)
+		return -EINVAL;
+
+	return __bdi_set_max_ratio(bdi, max_ratio * BDI_RATIO_SCALE);
+}
 EXPORT_SYMBOL(bdi_set_max_ratio);
 
 unsigned long long bdi_get_max_bytes(struct backing_dev_info *bdi)
-- 
2.30.2