From: Paul E. McKenney <paulmck@us.ibm.com>
Date: Sun, 8 Jan 2006 09:01:39 +0000 (-0800)
Subject: [PATCH] remove get_task_struct_rcu()
X-Git-Tag: v2.6.16-rc1~839
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d4829cd5b4bd1ea58ba1bebad44d562f4027c290;p=linux-2.6

[PATCH] remove get_task_struct_rcu()

The latest set of signal-RCU patches does not use get_task_struct_rcu().
Attached is a patch that removes it.

Signed-off-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/linux/sched.h b/include/linux/sched.h
index a6af77e9b4..20bd707491 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -878,18 +878,6 @@ extern void free_task(struct task_struct *tsk);
 extern void __put_task_struct(struct task_struct *tsk);
 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
 
-static inline int get_task_struct_rcu(struct task_struct *t)
-{
-	int oldusage;
-
-	do {
-		oldusage = atomic_read(&t->usage);
-		if (oldusage == 0)
-			return 0;
-	} while (cmpxchg(&t->usage.counter, oldusage, oldusage+1) != oldusage);
-	return 1;
-}
-
 extern void __put_task_struct_cb(struct rcu_head *rhp);
 
 static inline void put_task_struct(struct task_struct *t)