diff options
Diffstat (limited to 'arch/arm64/mm/flush.c')
| -rw-r--r-- | arch/arm64/mm/flush.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index a06c6ac770d4..fc4f710e9820 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -75,6 +75,20 @@ EXPORT_SYMBOL_GPL(__sync_icache_dcache); */ void flush_dcache_page(struct page *page) { + /* + * Only the head page's flags of HugeTLB can be cleared since the tail + * vmemmap pages associated with each HugeTLB page are mapped with + * read-only when CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is enabled (more + * details can refer to vmemmap_remap_pte()). Although + * __sync_icache_dcache() only set PG_dcache_clean flag on the head + * page struct, there is more than one page struct with PG_dcache_clean + * associated with the HugeTLB page since the head vmemmap page frame + * is reused (more details can refer to the comments above + * page_fixed_fake_head()). + */ + if (hugetlb_optimize_vmemmap_enabled() && PageHuge(page)) + page = compound_head(page); + if (test_bit(PG_dcache_clean, &page->flags)) clear_bit(PG_dcache_clean, &page->flags); } |