add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/resctrl/resctrl.h
..
..
@@ -33,6 +33,7 @@
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 	do {					\
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 		perror(err_msg);		\
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 		kill(ppid, SIGKILL);		\
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+		umount_resctrlfs();		\
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 		exit(EXIT_FAILURE);		\
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 	} while (0)
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