thp: avoid breaking huge pmd invariants in case of vma_adjust failures

[pandora-kernel.git] / include / linux / huge_mm.h

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index c590b08..8275952 100644 (file)
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -104,6 +104,19 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
 #error "hugepages can't be allocated by the buddy allocator"
 #endif
 extern int hugepage_madvise(unsigned long *vm_flags);
+extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
+                                   unsigned long start,
+                                   unsigned long end,
+                                   long adjust_next);
+static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
+                                        unsigned long start,
+                                        unsigned long end,
+                                        long adjust_next)
+{
+       if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
+               return;
+       __vma_adjust_trans_huge(vma, start, end, adjust_next);
+}
 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
 #define HPAGE_PMD_MASK ({ BUG(); 0; })
@@ -125,6 +138,12 @@ static inline int hugepage_madvise(unsigned long *vm_flags)
        BUG();
        return 0;
 }
+static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
+                                        unsigned long start,
+                                        unsigned long end,
+                                        long adjust_next)
+{
+}
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 #endif /* _LINUX_HUGE_MM_H */