riscv/mm: hugepage's PG_dcache_clean flag is only set in head page
HugeTLB pages are always fully mapped, so only setting head page's PG_dcache_clean flag is enough. Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> Link: https://lore.kernel.org/lkml/20220331065640.5777-2-songmuchun@bytedance.com/ Link: https://lore.kernel.org/r/20221024094725.3054311-2-tongtiangen@huawei.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -17,6 +17,13 @@ static inline void local_flush_icache_all(void)
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static inline void flush_dcache_page(struct page *page)
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{
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/*
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* HugeTLB pages are always fully mapped and only head page will be
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* set PG_dcache_clean (see comments in flush_icache_pte()).
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*/
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if (PageHuge(page))
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page = compound_head(page);
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if (test_bit(PG_dcache_clean, &page->flags))
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clear_bit(PG_dcache_clean, &page->flags);
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}
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@ -82,6 +82,13 @@ void flush_icache_pte(pte_t pte)
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{
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struct page *page = pte_page(pte);
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/*
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* HugeTLB pages are always fully mapped, so only setting head page's
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* PG_dcache_clean flag is enough.
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*/
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if (PageHuge(page))
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page = compound_head(page);
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if (!test_and_set_bit(PG_dcache_clean, &page->flags))
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flush_icache_all();
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}
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