[PATCH] Make RCU API inaccessible to non-GPL Linux kernel modules

Remove synchronize_kernel() (deprecated 2-APR-2005 in
http://lkml.org/lkml/2005/4/3/11) and makes the RCU API inaccessible to
non-GPL Linux kernel modules (as was announced more than one year ago in
http://lkml.org/lkml/2005/4/3/8).  Tested on x86 and ppc64.

Signed-off-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 0 insertions, 16 deletions

diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt
index 07cb93b82ba9..6e459420ee9f 100644
--- a/Documentation/RCU/whatisRCU.txt
+++ b/Documentation/RCU/whatisRCU.txt
@@ -790,7 +790,6 @@ RCU pointer update:
 
 RCU grace period:
 
-        synchronize_kernel (deprecated)
         synchronize_net
         synchronize_sched
         synchronize_rcu
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index f7293297f326..027285d0c26c 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -33,21 +33,6 @@ Who:	Adrian Bunk <bunk@stusta.de>
 
 ---------------------------
 
-What:   RCU API moves to EXPORT_SYMBOL_GPL
-When:   April 2006
-Files:  include/linux/rcupdate.h, kernel/rcupdate.c
-Why:    Outside of Linux, the only implementations of anything even
-        vaguely resembling RCU that I am aware of are in DYNIX/ptx,
-        VM/XA, Tornado, and K42.  I do not expect anyone to port binary
-        drivers or kernel modules from any of these, since the first two
-        are owned by IBM and the last two are open-source research OSes.
-        So these will move to GPL after a grace period to allow
-        people, who might be using implementations that I am not aware
-        of, to adjust to this upcoming change.
-Who:    Paul E. McKenney <paulmck@us.ibm.com>
-
----------------------------
-
 What:   raw1394: requests of type RAW1394_REQ_ISO_SEND, RAW1394_REQ_ISO_LISTEN
 When:   November 2006
 Why:    Deprecated in favour of the new ioctl-based rawiso interface, which is