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-rw-r--r--drivers/md/md.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 991f0fe2dcc6..b50eb4ac1b82 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -134,7 +134,9 @@ enum flag_bits {
Faulty, /* device is known to have a fault */
In_sync, /* device is in_sync with rest of array */
Bitmap_sync, /* ..actually, not quite In_sync. Need a
- * bitmap-based recovery to get fully in sync
+ * bitmap-based recovery to get fully in sync.
+ * The bit is only meaningful before device
+ * has been passed to pers->hot_add_disk.
*/
WriteMostly, /* Avoid reading if at all possible */
AutoDetected, /* added by auto-detect */