Minimizing header file inclusion is desirable. In this case, we can do
so just by forward declaring the enumeration our signature relies upon.

Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
---
 include/linux/hugetlb.h | 5 ++++-
 mm/hugetlb.c            | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 1d3246b31a41..dfb749eaf348 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h

@@ -11,7 +11,6 @@
 #include <linux/kref.h>
 #include <linux/pgtable.h>
 #include <linux/gfp.h>
-#include <linux/userfaultfd_k.h>
 
 struct ctl_table;
 struct user_struct;

@@ -136,6 +135,8 @@ unsigned long hugetlb_total_pages(void);
 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 			unsigned long address, unsigned int flags);
 #ifdef CONFIG_USERFAULTFD
+enum mcopy_atomic_mode;