add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/kernel/sync-r4k.c
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@@ -90,6 +90,9 @@
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 void synchronise_count_slave(int cpu)
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 {
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 	int i;
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+	unsigned long flags;
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+
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+	local_irq_save(flags);
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 	/*
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 	 * Not every cpu is online at the time this gets called,
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@@ -113,5 +116,7 @@
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 	}
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 	/* Arrange for an interrupt in a short while */
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 	write_c0_compare(read_c0_count() + COUNTON);
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+
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+	local_irq_restore(flags);
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 }
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 #undef NR_LOOPS