在 2020/11/5 下午11:36, Johannes Weiner 写道: >>> */ >>> > Yeah, I don't think this scenario warrants the full race diagram in > the code itself. > > But the code is highly specific - synchronizing one struct page member > for one particular use case. Let's keep at least a reference to what > we are synchronizing against. There is a non-zero chance that if the > comment goes out of date, so does the code. How about this? > > /* > * page_idle does a lockless/optimistic rmap scan on page->mapping. > * Make sure the compiler doesn't split the stores of anon_vma and > * the PAGE_MAPPING_ANON type identifier, otherwise the rmap code > * could mistake the mapping for a struct address_space and crash. > */ Thanks a lot to you all. I will update to v21 patch Alex
