On 7 Mar 2024, at 15:02, Andrew Morton wrote: > On Thu, 7 Mar 2024 13:18:53 -0500 Zi Yan <zi.yan@xxxxxxxx> wrote: > >> From: Zi Yan <ziy@xxxxxxxxxx> >> >> A folio can only be split into lower orders. Check new_order to make sure >> it is smaller than input folio order. > > It isn't clear what's being fixed here. Presumably something is > passing in such folios, but what and where and why and what are the > effects? > > Might it be that these folios are being caused by the debugfs > interface? Or something else? Since there is no new_order checks in debugfs before, any new_order can be passed via debugfs into split_huge_page_to_list_to_order(). I did not explicitly mention it here as the debugfs is added in the commit after the Fixes one. > > So I'll add it, but I do think more information and context would > improve the patch, please. Suitable Reported-by:, Closes: and Link: > tags, perhaps. -- Best Regards, Yan, Zi
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