Arnd Bergmann <a...@arndb.de> doubts that __kernel_size_t could be used here
so trying to fall back to gcc's <stddef.h>.

Fixes uapi header compilation error from userspace on ARCH=arm:

asm/signal.h:112:2: error: unknown type name ‘size_t’
  size_t ss_size;

Signed-off-by: Mikko Rapeli <mikko.rap...@iki.fi>
Cc: Arnd Bergmann <a...@arndb.de>
---
 arch/arm/include/uapi/asm/signal.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/include/uapi/asm/signal.h 
b/arch/arm/include/uapi/asm/signal.h
index 33073bdcf091..63066f624c10 100644
--- a/arch/arm/include/uapi/asm/signal.h
+++ b/arch/arm/include/uapi/asm/signal.h
@@ -12,6 +12,8 @@ struct siginfo;
 #define NSIG           32
 typedef unsigned long sigset_t;
 
+#include <stddef.h>
+
 #endif /* __KERNEL__ */
 
 #define SIGHUP          1
-- 
2.13.3

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