kernel/fork.c: remove redundant NULL check in dup_mm()
authorDaeseok Youn <daeseok.youn@gmail.com>
Thu, 23 Jan 2014 23:55:48 +0000 (15:55 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 24 Jan 2014 00:37:02 +0000 (16:37 -0800)
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

index 01ccc610991855144fafff82340ffc0af5c02bba..b6dd0bbf4240d7acec4af16c57e5d4f9cb330e8d 100644 (file)
@@ -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;