[PATCH] uml: use host AIO support

This patch makes UML use host AIO support when it (and
/usr/include/linux/aio_abi.h) are present.  This is only the support, with no
consumers - a consumer is coming in the next patch.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/include/init.h b/arch/um/include/init.h
index 55c2693..cbd79a8 100644
--- a/arch/um/include/init.h
+++ b/arch/um/include/init.h
@@ -111,7 +111,15 @@
 
 #ifndef __KERNEL__
 
-#define __initcall(fn) static initcall_t __initcall_##fn __init_call = fn
+#define __define_initcall(level,fn) \
+	static initcall_t __initcall_##fn __attribute_used__ \
+	__attribute__((__section__(".initcall" level ".init"))) = fn
+
+/* Userspace initcalls shouldn't depend on anything in the kernel, so we'll
+ * make them run first.
+ */
+#define __initcall(fn) __define_initcall("1", fn)
+
 #define __exitcall(fn) static exitcall_t __exitcall_##fn __exit_call = fn
 
 #define __init_call __attribute__ ((unused,__section__ (".initcall.init")))