Fixes userspace compilation error:

error: unknown type name ‘__kernel_key_t’

Signed-off-by: Mikko Rapeli <mikko.rap...@iki.fi>
Acked-by: Arnd Bergmann <a...@arndb.de>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: H.J. Lu <hjl.to...@gmail.com>
---
 include/uapi/asm-generic/ipcbuf.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/uapi/asm-generic/ipcbuf.h 
b/include/uapi/asm-generic/ipcbuf.h
index 3dbcc1e771c0..909f825096f4 100644
--- a/include/uapi/asm-generic/ipcbuf.h
+++ b/include/uapi/asm-generic/ipcbuf.h
@@ -1,6 +1,8 @@
 #ifndef __ASM_GENERIC_IPCBUF_H
 #define __ASM_GENERIC_IPCBUF_H
 
+#include <linux/posix_types.h>
+
 /*
  * The generic ipc64_perm structure:
  * Note extra padding because this structure is passed back and forth
-- 
2.13.3

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