unsigned long _pt_pad_1; /* compound_head */
pgtable_t pmd_huge_pte; /* protected by page->ptl */
unsigned long _pt_pad_2; /* mapping */
- struct mm_struct *pt_mm; /* x86 pgds only */
+ union {
+ struct mm_struct *pt_mm; /* x86 pgds only */
+ atomic_t pt_frag_refcount; /* powerpc */
+ };
#if ALLOC_SPLIT_PTLOCKS
spinlock_t *ptl;
#else