Patch "rcu: Export init_rcu_head() and destroy_rcu_head() to GPL modules" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    rcu: Export init_rcu_head() and destroy_rcu_head() to GPL modules

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rcu-export-init_rcu_head-and-destroy_rcu_head-to-gpl-modules.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 156baec39732f025dc778e00da95fc10d6e45885 Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Date: Thu, 7 Dec 2017 09:40:38 -0800
Subject: rcu: Export init_rcu_head() and destroy_rcu_head() to GPL modules

From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

commit 156baec39732f025dc778e00da95fc10d6e45885 upstream.

Use of init_rcu_head() and destroy_rcu_head() from modules results in
the following build-time error with CONFIG_DEBUG_OBJECTS_RCU_HEAD=y:

	ERROR: "init_rcu_head" [drivers/scsi/scsi_mod.ko] undefined!
	ERROR: "destroy_rcu_head" [drivers/scsi/scsi_mod.ko] undefined!

This commit therefore adds EXPORT_SYMBOL_GPL() for each to allow them to
be used by GPL-licensed kernel modules.

Reported-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/rcu/update.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -422,11 +422,13 @@ void init_rcu_head(struct rcu_head *head
 {
 	debug_object_init(head, &rcuhead_debug_descr);
 }
+EXPORT_SYMBOL_GPL(init_rcu_head);
 
 void destroy_rcu_head(struct rcu_head *head)
 {
 	debug_object_free(head, &rcuhead_debug_descr);
 }
+EXPORT_SYMBOL_GPL(destroy_rcu_head);
 
 static bool rcuhead_is_static_object(void *addr)
 {


Patches currently in stable-queue which might be from paulmck@linux.vnet.ibm.com are

queue-4.15/rcu-export-init_rcu_head-and-destroy_rcu_head-to-gpl-modules.patch