add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/include/uapi/linux/if_pppol2tp.h
..
..
@@ -75,7 +75,7 @@
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 };
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 /* Socket options:
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- * DEBUG	- bitmask of debug message categories
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+ * DEBUG	- bitmask of debug message categories (not used)
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  * SENDSEQ	- 0 => don't send packets with sequence numbers
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  *		  1 => send packets with sequence numbers
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  * RECVSEQ	- 0 => receive packet sequence numbers are optional