linux-kernel - [PATCH v2] mm-move-mremap-from-file_operations-to-vm_operations

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Date:	Tue, 21 Jul 2015 17:29:03 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Joonsoo Kim <js1304@...il.com>, Benjamin LaHaise <bcrl@...ck.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2]
	mm-move-mremap-from-file_operations-to-vm_operations_struct-fix

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@...el.com>
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Oleg Nesterov <oleg@...hat.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,
+#ifdef 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


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