disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/arch/nds32/mm/Makefile
..
..
@@ -3,6 +3,7 @@
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                                    mm-nds32.o cacheflush.o proc.o
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 obj-$(CONFIG_ALIGNMENT_TRAP)	+= alignment.o
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+obj-$(CONFIG_HIGHMEM)           += highmem.o
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 ifdef CONFIG_FUNCTION_TRACER
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 CFLAGS_REMOVE_proc.o     = $(CC_FLAGS_FTRACE)