From: Paul E. McKenney <paulmck@linux.ibm.com>
Date: Thu, 23 May 2019 20:56:12 +0000 (-0700)
Subject: rcu/nocb: Make __call_rcu_nocb_wake() safe for many callbacks
X-Git-Tag: v5.4-rc1~181^2~1^2^2~17
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ce0a825e40606d6dbe6dfe90d4d4c0ccc9fa3bde;p=thirdparty%2Fkernel%2Flinux.git

rcu/nocb: Make __call_rcu_nocb_wake() safe for many callbacks

It might be hard to imagine having more than two billion callbacks
queued on a single CPU's ->cblist, but someone will do it sometime.
This commit therefore makes __call_rcu_nocb_wake() handle this situation
by upgrading local variable "len" from "int" to "long".

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
---

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index b9e00660af609..5cbc0848647c7 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1615,7 +1615,7 @@ static void __call_rcu_nocb_wake(struct rcu_data *rdp, bool was_alldone,
 				 unsigned long flags)
 				 __releases(rdp->nocb_lock)
 {
-	int len;
+	long len;
 	struct task_struct *t;
 
 	// If we are being polled or there is no kthread, just leave.