From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Thu, 7 Dec 2017 17:40:38 +0000 (-0800)
Subject: rcu: Export init_rcu_head() and destroy_rcu_head() to GPL modules
X-Git-Tag: v4.14.20~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ce6faf10fd6544febcf5c3efe453193def873c60;p=platform%2Fkernel%2Flinux-rpi.git

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

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>
---

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 5033b66..7a577bd 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -421,11 +421,13 @@ 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)
 {