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Scan all pages in a to-be-split folio to >> determine which after-split folios need the flag. >> >> An alternatives is to change PG_has_hwpoisoned to PG_maybe_hwpoisoned to >> avoid the scan and set it on all after-split folios, but resulting false >> positive has undesirable negative impact. To remove false positive, caller >> of folio_test_has_hwpoisoned() and folio_contain_hwpoisoned_page() needs to >> do the scan. That might be causing a hassle for current and future callers >> and more costly than doing the scan in the split code. More details are >> discussed in [1]. >> >> This issue can be exposed via: >> 1. splitting a has_hwpoisoned folio to >0 order from debugfs interface; > > Is it easy to add a selftest in split_huge_page_test for this scenario? Probably, but I prefer to do this in a separate memory failure test. I think the steps are: 0. set up a SIGBUS handler, 1. get a XFS image, like split_huge_page_test does, 2. set block size > page size, 3. fault in a large folio bigger than block size, 4. madvise(MADV_HWPOISON), 5. catch SIGBUS since the folio cannot be split to order-0 and check the corresponding folio's has_hwpoison flag. I will put this on my TODO list. > >> 2. truncating part of a has_hwpoisoned folio in >> truncate_inode_partial_folio(). >> > -- > Pankaj -- Best Regards, Yan, Zi