disable cpu isolcpus

hc

2023-12-09 958e46acc8e900e8569dd467c1af9b8d2d019394

 kernel/arch/arm/mach-keystone/Makefile
..
..
@@ -1,9 +1,6 @@
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 # SPDX-License-Identifier: GPL-2.0
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 obj-y					:= keystone.o smc.o
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-plus_sec := $(call as-instr,.arch_extension sec,+sec)
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-AFLAGS_smc.o				:=-Wa,-march=armv7-a$(plus_sec)
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-
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 obj-$(CONFIG_SMP)			+= platsmp.o
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 # PM domain driver for Keystone SOCs