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-rw-r--r--include/linux/mm.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f28f46eade6a..d354a72e6127 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1477,9 +1477,15 @@ static inline void pgtable_page_dtor(struct page *page)
#if USE_SPLIT_PMD_PTLOCKS
+static struct page *pmd_to_page(pmd_t *pmd)
+{
+ unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
+ return virt_to_page((void *)((unsigned long) pmd & mask));
+}
+
static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
{
- return ptlock_ptr(virt_to_page(pmd));
+ return ptlock_ptr(pmd_to_page(pmd));
}
static inline bool pgtable_pmd_page_ctor(struct page *page)
@@ -1498,7 +1504,7 @@ static inline void pgtable_pmd_page_dtor(struct page *page)
ptlock_free(page);
}
-#define pmd_huge_pte(mm, pmd) (virt_to_page(pmd)->pmd_huge_pte)
+#define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte)
#else