add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/bmips/dma.c
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@@ -64,6 +64,8 @@
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 	return dma_addr;
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 }
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+bool bmips_rac_flush_disable;
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+
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 void arch_sync_dma_for_cpu_all(void)
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 {
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 	void __iomem *cbr = BMIPS_GET_CBR();
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@@ -74,6 +76,9 @@
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 	    boot_cpu_type() != CPU_BMIPS4380)
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 		return;
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+	if (unlikely(bmips_rac_flush_disable))
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+		return;
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+
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 	/* Flush stale data out of the readahead cache */
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 	cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
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 	__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);