Merge tag 'for-linus-20191012' of git://git.kernel.dk/linux-block

[linux-2.6-microblaze.git] / include / linux / huge_mm.h

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 61c9ffd..93d5cf0 100644 (file)
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -108,7 +108,12 @@ static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
 
        if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
                return true;
-
+       /*
+        * For dax vmas, try to always use hugepage mappings. If the kernel does
+        * not support hugepages, fsdax mappings will fallback to PAGE_SIZE
+        * mappings, and device-dax namespaces, that try to guarantee a given
+        * mapping size, will fail to enable
+        */
        if (vma_is_dax(vma))
                return true;