diff --git a/arch/sparc/kernel/sys_sunos.c b/arch/sparc/kernel/sys_sunos.c
index 0bf8c165fc929240d24b3d26bf414e9d2551eb60..da6606f0cffc41b4f85e3d6ea65c4042361d6f54 100644
--- a/arch/sparc/kernel/sys_sunos.c
+++ b/arch/sparc/kernel/sys_sunos.c
@@ -859,14 +859,16 @@ asmlinkage int sunos_wait4(pid_t pid, unsigned int __user *stat_addr,
 	return ret;
 }
 
-extern int kill_pg(int, int, int);
 asmlinkage int sunos_killpg(int pgrp, int sig)
 {
 	int ret;
 
-	lock_kernel();
-	ret = kill_pg(pgrp, sig, 0);
-	unlock_kernel();
+	rcu_read_lock();
+	ret = -EINVAL;
+	if (pgrp > 0)
+		ret = kill_pgrp(find_pid(pgrp), sig, 0);
+	rcu_read_unlock();
+
 	return ret;
 }
 
diff --git a/arch/sparc64/kernel/sys_sunos32.c b/arch/sparc64/kernel/sys_sunos32.c
index 2ebc2c0513832ad64ec09b9266d245eef0028622..4cff95b7b3a4732cdf1b2405833691b02216bf25 100644
--- a/arch/sparc64/kernel/sys_sunos32.c
+++ b/arch/sparc64/kernel/sys_sunos32.c
@@ -824,10 +824,17 @@ asmlinkage int sunos_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, in
 	return ret;
 }
 
-extern int kill_pg(int, int, int);
 asmlinkage int sunos_killpg(int pgrp, int sig)
 {
-	return kill_pg(pgrp, sig, 0);
+	int ret;
+
+	rcu_read_lock();
+	ret = -EINVAL;
+	if (pgrp > 0)
+		ret = kill_pgrp(find_pid(pgrp), sig, 0);
+	rcu_read_unlock();
+
+	return ret;
 }
 
 asmlinkage int sunos_audit(void)