add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/include/uapi/linux/wait.h
..
..
@@ -17,6 +17,7 @@
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 #define P_ALL		0
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 #define P_PID		1
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 #define P_PGID		2
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+#define P_PIDFD		3
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 #endif /* _UAPI_LINUX_WAIT_H */