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[Backport] 性能优化:减少不必要的ipi中断 #353

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@zyf-zte

合入两个上游的性能优化补丁:
补丁1
riscv: Only flush the mm icache when setting an exec pte
描述:设置pte时,只需要对运行过该进程的cpu发送ipi中断,避免ipi中断对非必要cpu的干扰
补丁链接:torvalds/linux@01261e2

补丁2
riscv: jump_label: Batch icache maintenance
描述: 对指令进行整体更新后,在总的发送一次Ipi中断,减少ipi中断发送的次数。
补丁链接:torvalds/linux@652b56b

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