Unverified Commit d33deda0 authored Oct 24, 2022 by Tong Tiangen Committed by Palmer Dabbelt Dec 02, 2022

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>

parent 6925ba3d

arch/riscv/include/asm/cacheflush.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,13 @@ static inline void local_flush_icache_all(void)

		static inline void flush_dcache_page(struct page *page)
		{
		/*
		* HugeTLB pages are always fully mapped and only head page will be
		* set PG_dcache_clean (see comments in flush_icache_pte()).
		*/
		if (PageHuge(page))
		page = compound_head(page);

		if (test_bit(PG_dcache_clean, &page->flags))
		clear_bit(PG_dcache_clean, &page->flags);
		}

arch/riscv/mm/cacheflush.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -82,6 +82,13 @@ void flush_icache_pte(pte_t pte)
		{
		struct page *page = pte_page(pte);

		/*
		* HugeTLB pages are always fully mapped, so only setting head page's
		* PG_dcache_clean flag is enough.
		*/
		if (PageHuge(page))
		page = compound_head(page);

		if (!test_and_set_bit(PG_dcache_clean, &page->flags))
		flush_icache_all();
		}