vm_area_operations: kill ->migrate()

the only instance this method has ever grown was one in kernfs -
one that call ->migrate() of another vm_ops if it exists.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 22 deletions

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 697390ea47b8..ddc9f9612f16 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -448,27 +448,6 @@ static struct mempolicy *kernfs_vma_get_policy(struct vm_area_struct *vma,
         return pol;
 }
 
-static int kernfs_vma_migrate(struct vm_area_struct *vma,
-                              const nodemask_t *from, const nodemask_t *to,
-                              unsigned long flags)
-{
-        struct file *file = vma->vm_file;
-        struct kernfs_open_file *of = kernfs_of(file);
-        int ret;
-
-        if (!of->vm_ops)
-                return 0;
-
-        if (!kernfs_get_active(of->kn))
-                return 0;
-
-        ret = 0;
-        if (of->vm_ops->migrate)
-                ret = of->vm_ops->migrate(vma, from, to, flags);
-
-        kernfs_put_active(of->kn);
-        return ret;
-}
 #endif
 
 static const struct vm_operations_struct kernfs_vm_ops = {
@@ -479,7 +458,6 @@ static const struct vm_operations_struct kernfs_vm_ops = {
 #ifdef CONFIG_NUMA
         .set_policy     = kernfs_vma_set_policy,
         .get_policy     = kernfs_vma_get_policy,
-        .migrate        = kernfs_vma_migrate,
 #endif
 };