[PATCH] Fixes for RCU handling of sighand_struct

[Paul E. McKenney]

Hello!

Some fixes to RCU usage for sighand_struct, adding a couple of needed
rcu_assign_pointer() calls.

Signed-off-by: <paulmck@xxxxxxxxxx>

---

diff -urpNa linux-2.6.14-rc5-rt5/fs/exec.c linux-2.6.14-rc5-rt5-sighandRCUfix/fs/exec.c
--- linux-2.6.14-rc5-rt5/fs/exec.c	2005-10-24 05:59:08.000000000 -0700
+++ linux-2.6.14-rc5-rt5-sighandRCUfix/fs/exec.c	2005-10-31 15:38:02.000000000 -0800
@@ -777,7 +777,7 @@ no_thread_group:
 		spin_lock(&oldsighand->siglock);
 		spin_lock(&newsighand->siglock);
 
-		current->sighand = newsighand;
+		rcu_assign_pointer(current->sighand, newsighand);
 		recalc_sigpending();
 
 		spin_unlock(&newsighand->siglock);
diff -urpNa linux-2.6.14-rc5-rt5/kernel/fork.c linux-2.6.14-rc5-rt5-sighandRCUfix/kernel/fork.c
--- linux-2.6.14-rc5-rt5/kernel/fork.c	2005-10-24 05:59:08.000000000 -0700
+++ linux-2.6.14-rc5-rt5-sighandRCUfix/kernel/fork.c	2005-10-31 15:35:14.000000000 -0800
@@ -816,7 +816,7 @@ static inline int copy_sighand(unsigned 
 		return 0;
 	}
 	sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL);
-	tsk->sighand = sig;
+	rcu_assign_pointer(tsk->sighand, sig);
 	if (!sig)
 		return -ENOMEM;
 	spin_lock_init(&sig->siglock);
-
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