From 9fcd5003c0363af140a06aba94e62c9e1ea0381e Mon Sep 17 00:00:00 2001
From: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Date: Mon, 11 Jan 2016 16:45:30 +0100
Subject: [PATCH] Fix fusion: Unknown symbol tasklist_lock (err 0)

Commit 28f6569ab7d0 renamed TREE_PREEMPT_RCU to PREEMPT_RCU in 3.19
As a result, the code incorrectly falls back to using tasklist_lock
(which was made private in 2.6.18)

Always use rcu_read_lock on modern kernels.

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
---
 linux/drivers/char/fusion/fusionee.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/linux/drivers/char/fusion/fusionee.c b/linux/drivers/char/fusion/fusionee.c
index ef067f5bc831..70cd0a665f98 100644
--- a/linux/drivers/char/fusion/fusionee.c
+++ b/linux/drivers/char/fusion/fusionee.c
@@ -925,7 +925,7 @@ fusionee_kill(FusionDev * dev,
                if (f != fusionee && (!target || target == f->id)) {
                     struct task_struct *p;
 
-#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) || defined(CONFIG_TINY_RCU) || defined(rcu_read_lock)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
                     rcu_read_lock();
 #else
                     read_lock(&tasklist_lock);
@@ -946,7 +946,7 @@ fusionee_kill(FusionDev * dev,
                          }
                     }
 
-#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) || defined(CONFIG_TINY_RCU) || defined(rcu_read_unlock)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
                     rcu_read_unlock();
 #else
                     read_unlock(&tasklist_lock);