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authorPaul E. McKenney <paulmck@us.ibm.com>2006-06-23 02:05:51 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 07:43:07 -0700
commitd83015b8f62ee3fcd338f6f009051ed57f77a531 (patch)
tree11e30548e6b07045f8a17aa4661e1cde6f374b18
parent55f4e8d156d23709739029afb108932ef94cac94 (diff)
downloadlinux-linaro-stable-d83015b8f62ee3fcd338f6f009051ed57f77a531.tar.gz
[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>
-rw-r--r--Documentation/RCU/whatisRCU.txt1
-rw-r--r--Documentation/feature-removal-schedule.txt15
-rw-r--r--include/linux/rcupdate.h3
-rw-r--r--kernel/rcupdate.c13
4 files changed, 3 insertions, 29 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
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 970284f571a6..6312758393b6 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -246,7 +246,7 @@ extern int rcu_needs_cpu(int cpu);
* softirq handlers will have completed, since in some kernels, these
* handlers can run in process context, and can block.
*
- * This primitive provides the guarantees made by the (deprecated)
+ * This primitive provides the guarantees made by the (now removed)
* synchronize_kernel() API. In contrast, synchronize_rcu() only
* guarantees that rcu_read_lock() sections will have completed.
* In "classic RCU", these two guarantees happen to be one and
@@ -264,7 +264,6 @@ extern void FASTCALL(call_rcu(struct rcu_head *head,
void (*func)(struct rcu_head *head)));
extern void FASTCALL(call_rcu_bh(struct rcu_head *head,
void (*func)(struct rcu_head *head)));
-extern __deprecated_for_modules void synchronize_kernel(void);
extern void synchronize_rcu(void);
void synchronize_idle(void);
extern void rcu_barrier(void);
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 2058f88c7bbb..20e9710fc21c 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -612,14 +612,6 @@ void synchronize_rcu(void)
wait_for_completion(&rcu.completion);
}
-/*
- * Deprecated, use synchronize_rcu() or synchronize_sched() instead.
- */
-void synchronize_kernel(void)
-{
- synchronize_rcu();
-}
-
module_param(blimit, int, 0);
module_param(qhimark, int, 0);
module_param(qlowmark, int, 0);
@@ -627,7 +619,6 @@ module_param(qlowmark, int, 0);
module_param(rsinterval, int, 0);
#endif
EXPORT_SYMBOL_GPL(rcu_batches_completed);
-EXPORT_SYMBOL_GPL_FUTURE(call_rcu); /* WARNING: GPL-only in April 2006. */
-EXPORT_SYMBOL_GPL_FUTURE(call_rcu_bh); /* WARNING: GPL-only in April 2006. */
+EXPORT_SYMBOL_GPL(call_rcu);
+EXPORT_SYMBOL_GPL(call_rcu_bh);
EXPORT_SYMBOL_GPL(synchronize_rcu);
-EXPORT_SYMBOL_GPL_FUTURE(synchronize_kernel); /* WARNING: GPL-only in April 2006. */