These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / fs / jffs2 / README.Locking

diff --git a/kernel/fs/jffs2/README.Locking b/kernel/fs/jffs2/README.Locking
index 3ea3655..8918ac9 100644 (file)
--- a/kernel/fs/jffs2/README.Locking
+++ b/kernel/fs/jffs2/README.Locking
@@ -2,10 +2,6 @@
        JFFS2 LOCKING DOCUMENTATION
        ---------------------------
 
-At least theoretically, JFFS2 does not require the Big Kernel Lock
-(BKL), which was always helpfully obtained for it by Linux 2.4 VFS
-code. It has its own locking, as described below.
-
 This document attempts to describe the existing locking rules for
 JFFS2. It is not expected to remain perfectly up to date, but ought to
 be fairly close.
@@ -69,6 +65,7 @@ Ordering constraints:
           any f->sem held.
        2. Never attempt to lock two file mutexes in one thread.
           No ordering rules have been made for doing so.
+       3. Never lock a page cache page with f->sem held.
 
 
        erase_completion_lock spinlock