> On Jan 13, 2024, at 17:44, Nanyong Sun <sunnanyong@xxxxxxxxxx> wrote: > > Implement vmemmap_update_pmd and vmemmap_update_pte on arm64 to do > BBM(break-before-make) logic when change the page table of vmemmap > address, they will under the init_mm.page_table_lock. > If a translation fault of vmemmap address concurrently happened after > pte/pmd cleared, vmemmap page fault handler will acquire the > init_mm.page_table_lock to wait for vmemmap update to complete, > by then the virtual address is valid again, so PF can return and > access can continue. > In other case, do the traditional kernel fault. > > Implement vmemmap_flush_tlb_all/range on arm64 with nothing > to do because tlb already flushed in every single BBM. > > Signed-off-by: Nanyong Sun <sunnanyong@xxxxxxxxxx> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Thanks.
