fs/aio.c can't be compiled if CONFIG_MMU=n, filemap_page_mkwrite()
is not defined in this case. Add yet another "must not be called"
helper into nommu.c to make the linker happy.
I still think this is pointless, afaics sys_io_setup() simply can't
succeed if CONFIG_MMU=n. Instead we should make CONFIG_AIO depend
on CONFIG_MMU.
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---
mm/nommu.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/mm/nommu.c b/mm/nommu.c
index e3026fd..979afad 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -2008,6 +2008,12 @@ void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf)
}
EXPORT_SYMBOL(filemap_map_pages);
+int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ BUG();
+ return 0;
+}
+
static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
unsigned long addr, void *buf, int len, int write)
{
--
1.5.5.1
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