From 68ce670b6e8edc30551862e7f6a306e45389e189 Mon Sep 17 00:00:00 2001
From: Daeseok Youn <daeseok.youn@gmail.com>
Date: Thu, 23 Jan 2014 15:55:48 -0800
Subject: [PATCH] kernel/fork.c: remove redundant NULL check in dup_mm()

current->mm doesn't need a NULL check in dup_mm().  Becasue dup_mm() is
used only in copy_mm() and current->mm is checked whether it is NULL or
not in copy_mm() before calling dup_mm().

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 kernel/fork.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 01ccc6109918..b6dd0bbf4240 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -805,9 +805,6 @@ static struct mm_struct *dup_mm(struct task_struct *tsk)
 	struct mm_struct *mm, *oldmm = current->mm;
 	int err;
 
-	if (!oldmm)
-		return NULL;
-
 	mm = allocate_mm();
 	if (!mm)
 		goto fail_nomem;