diff --git a/[refs] b/[refs]
index 157bf6b6c04a..e05d29a3bdea 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e45c9effed903ba3fdbd6ef0498ee8989c35af0a
+refs/heads/master: abffc0207f12563f17bbde96e4cc0d9f3d7e2a53
diff --git a/trunk/Documentation/sysctl/vm.txt b/trunk/Documentation/sysctl/vm.txt
index b606c2c4dd37..30289fab86eb 100644
--- a/trunk/Documentation/sysctl/vm.txt
+++ b/trunk/Documentation/sysctl/vm.txt
@@ -80,8 +80,10 @@ dirty_background_bytes
 Contains the amount of dirty memory at which the pdflush background writeback
 daemon will start writeback.
 
-If dirty_background_bytes is written, dirty_background_ratio becomes a function
-of its value (dirty_background_bytes / the amount of dirtyable system memory).
+Note: dirty_background_bytes is the counterpart of dirty_background_ratio. Only
+one of them may be specified at a time. When one sysctl is written it is
+immediately taken into account to evaluate the dirty memory limits and the
+other appears as 0 when read.
 
 ==============================================================
 
@@ -97,8 +99,10 @@ dirty_bytes
 Contains the amount of dirty memory at which a process generating disk writes
 will itself start writeback.
 
-If dirty_bytes is written, dirty_ratio becomes a function of its value
-(dirty_bytes / the amount of dirtyable system memory).
+Note: dirty_bytes is the counterpart of dirty_ratio. Only one of them may be
+specified at a time. When one sysctl is written it is immediately taken into
+account to evaluate the dirty memory limits and the other appears as 0 when
+read.
 
 Note: the minimum value allowed for dirty_bytes is two pages (in bytes); any
 value lower than this limit will be ignored and the old configuration will be