add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/mm/cacheflush.c
..
..
@@ -85,7 +85,9 @@
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 {
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 	struct page *page = pte_page(pte);
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-	if (!test_and_set_bit(PG_dcache_clean, &page->flags))
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+	if (!test_bit(PG_dcache_clean, &page->flags)) {
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 		flush_icache_all();
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+		set_bit(PG_dcache_clean, &page->flags);
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+	}
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 }
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 #endif /* CONFIG_MMU */