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%3Ba=su...

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