[PATCH v3] mm-move-mremap-from-file_operations-to-vm_operations_struct-fix

[Oleg Nesterov <oleg@redhat.com>]

Andrew,

this replaces

	mm-move-mremap-from-file_operations-to-vm_operations_struct-fix.patch

in -mm tree nacked by Benjamin.

fs/aio.c can't be compiled if CONFIG_MMU=n, filemap_page_mkwrite() is
not defined in this case. Add ifdef(CONFIG_MMU) into aio_ring_vm_ops.

Note that this only fixes the build error, currently aio doesn't work
if !CONFIG_MMU anyway.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 fs/aio.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index c122624..822c199 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -338,9 +338,11 @@ static int aio_ring_mremap(struct vm_area_struct *vma)
 
 static const struct vm_operations_struct aio_ring_vm_ops = {
 	.mremap		= aio_ring_mremap,
+#if IS_ENABLED(CONFIG_MMU)
 	.fault		= filemap_fault,
 	.map_pages	= filemap_map_pages,
 	.page_mkwrite	= filemap_page_mkwrite,
+#endif
 };
 
 static int aio_ring_mmap(struct file *file, struct vm_area_struct *vma)
-- 
1.7.1