dax: Create local variable for VMA in dax_iomap_pte_fault()

There are already two users and more are coming.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/dax.c b/fs/dax.c
index 116eef8d6c69..c09465884bbe 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1108,7 +1108,8 @@ static int dax_fault_return(int error)
 static int dax_iomap_pte_fault(struct vm_fault *vmf,
                                const struct iomap_ops *ops)
 {
-        struct address_space *mapping = vmf->vma->vm_file->f_mapping;
+        struct vm_area_struct *vma = vmf->vma;
+        struct address_space *mapping = vma->vm_file->f_mapping;
         struct inode *inode = mapping->host;
         unsigned long vaddr = vmf->address;
         loff_t pos = (loff_t)vmf->pgoff << PAGE_SHIFT;
@@ -1196,7 +1197,7 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
         case IOMAP_MAPPED:
                 if (iomap.flags & IOMAP_F_NEW) {
                         count_vm_event(PGMAJFAULT);
-                        count_memcg_event_mm(vmf->vma->vm_mm, PGMAJFAULT);
+                        count_memcg_event_mm(vma->vm_mm, PGMAJFAULT);
                         major = VM_FAULT_MAJOR;
                 }
                 error = dax_insert_mapping(vmf, &iomap, pos, entry);