Merge tag 'libnvdimm-for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdim...

[linux-2.6-block.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index 53373b7a15126287462c0b93d5189d0d9a687bf5..2248529e71c11218b1d008d3c0b40f9d6df61370 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1904,12 +1904,26 @@ int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
 }
 EXPORT_SYMBOL(vm_insert_pfn_prot);
 
+static bool vm_mixed_ok(struct vm_area_struct *vma, pfn_t pfn)
+{
+       /* these checks mirror the abort conditions in vm_normal_page */
+       if (vma->vm_flags & VM_MIXEDMAP)
+               return true;
+       if (pfn_t_devmap(pfn))
+               return true;
+       if (pfn_t_special(pfn))
+               return true;
+       if (is_zero_pfn(pfn_t_to_pfn(pfn)))
+               return true;
+       return false;
+}
+
 static int __vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
                        pfn_t pfn, bool mkwrite)
 {
        pgprot_t pgprot = vma->vm_page_prot;
 
-       BUG_ON(!(vma->vm_flags & VM_MIXEDMAP));
+       BUG_ON(!vm_mixed_ok(vma, pfn));
 
        if (addr < vma->vm_start || addr >= vma->vm_end)
                return -EFAULT;