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>

1 files changed, 0 insertions, 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;