[PATCH] docs/memory-hotplug: adjust the explanation of valid_zones sysfs

[Wei Yang <richard.weiyang@gmail.com>]

After commit "mm, memory_hotplug: do not associate hotadded memory to zones
until online", the meaning of valid_zones is changed.

1. When the memory block is online, it returns the onlined zone name
2. We won't have "Movable Normal" case, because default_zone couldn't be
MOVABLE

This patch adjust the document according the code change.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
 Documentation/memory-hotplug.txt | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/memory-hotplug.txt b/Documentation/memory-hotplug.txt
index 670f3ded0802..d85ceb53f52a 100644
--- a/Documentation/memory-hotplug.txt
+++ b/Documentation/memory-hotplug.txt
@@ -171,15 +171,15 @@ Under each memory block, you can see 5 files:
                     block is removable and a value of 0 indicates that
                     it is not removable. A memory block is removable only if
                     every section in the block is removable.
-'valid_zones'     : read-only: designed to show which zones this memory block
-		    can be onlined to.
-		    The first column shows it's default zone.
+'valid_zones'     : read-only: shows different information based on state.
+		    When state is online, it is designed to show the
+		    zone name this memory block is onlined to.
+		    When state is offline, it is designed to show which zones
+		    this memory block can be onlined to.  The first column
+		    shows it's default zone.
 		    "memory6/valid_zones: Normal Movable" shows this memoryblock
 		    can be onlined to ZONE_NORMAL by default and to ZONE_MOVABLE
 		    by online_movable.
-		    "memory7/valid_zones: Movable Normal" shows this memoryblock
-		    can be onlined to ZONE_MOVABLE by default and to ZONE_NORMAL
-		    by online_kernel.
 
 NOTE:
   These directories/files appear after physical memory hotplug phase.
-- 
2.11.0

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