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 cz0oQEfJ 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Zi Yan wrote: >>>>>>> >>>>>>> >>>>>>> More details: >>>>>>> later at sg_vma_fault(), the driver just handles a page fault by su= pplying >>>>>>> a subpage from a pre-allocated compound page[3]. We then get a larg= e folio >>>>>>> without !CONFIG_TRANSPARENT_HUGEPAGE. >>>>>> >>>>>> We can identify such non-folio (but compound) things by looking at P= G_large_rmappable IIRC. >>>>> >>>>> OK, back to the issue. The patch below should fix the issue? >>>>> >>>>> Hi =E6=98=AF=E5=8F=82=E5=B7=AE, >>>>> >>>>> Can you test it? >>>>> >>> >>> >>>> I think you have to test for folio_test_large() before testing folio_t= est_large_rmappable(). >>> >>> Oh, forgot that. Thanks. >>> >>> >>> =C2=A0From 8dda4bba9964890462eca3ef3cce57bb4fab8313 Mon Sep 17 00:00:00= 2001 >>> From: Zi Yan >>> Date: Wed, 4 Feb 2026 16:04:19 -0500 >>> Subject: [PATCH] mm/memory_failure: reject unsupported non-folio compou= nd page >>> >>> Signed-off-by: Zi Yan >>> --- >>> =C2=A0 mm/memory-failure.c | 8 ++++++-- >>> =C2=A0 1 file changed, 6 insertions(+), 2 deletions(-) >>> >>> diff --git a/mm/memory-failure.c b/mm/memory-failure.c >>> index 825c706ac576..137c67fda57e 100644 >>> --- a/mm/memory-failure.c >>> +++ b/mm/memory-failure.c >>> @@ -2440,9 +2440,13 @@ int memory_failure(unsigned long pfn, int flags) >>> >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 folio =3D page_folio(p); >>> >>> -=C2=A0=C2=A0=C2=A0 /* filter pages that are protected from hwpoison te= st by users */ >>> +=C2=A0=C2=A0=C2=A0 /* >>> +=C2=A0=C2=A0=C2=A0=C2=A0 * filter pages that are protected from hwpois= on test by users >>> +=C2=A0=C2=A0=C2=A0=C2=A0 * or unsupported non folio compound pages >>> +=C2=A0=C2=A0=C2=A0=C2=A0 */ >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 folio_lock(folio); >>> -=C2=A0=C2=A0=C2=A0 if (hwpoison_filter(p)) { >>> +=C2=A0=C2=A0=C2=A0 if (hwpoison_filter(p) || >>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (folio_test_large(folio) &&= !folio_test_large_rmappable(folio))) { >> >> Just curious, would this filter out pte-mapped THP/mTHP folios? No. All folios (including pre-mapped/mTHP ones) are large_rmappable. > > Thanks all. > > memory_failure() can meet various types of folios. So in get_hwpoison_pag= e(), > HWPoisonHandlable() and PageHuge() are used to check whether the folio ca= n > be handled. But in madvise(MADV_HWPOISON) scene, MF_COUNT_INCREASED is se= t in > flag, so this check is skipped and warning triggered. Might HWPoisonHandl= able() > check be always used to make sure the folio is in sane types? Something l= ike > below (i.e. remove the MF_COUNT_INCREASED check before calling get_hwpois= on_page): > > diff --git a/mm/memory-failure.c b/mm/memory-failure.c > index 825c706ac576..ba4231858a36 100644 > --- a/mm/memory-failure.c > +++ b/mm/memory-failure.c > @@ -2411,31 +2411,29 @@ int memory_failure(unsigned long pfn, int flags) > * In fact it's dangerous to directly bump up page count from 0, > * that may make page_ref_freeze()/page_ref_unfreeze() mismatch. > */ > - if (!(flags & MF_COUNT_INCREASED)) { > - res =3D get_hwpoison_page(p, flags); > - if (!res) { > - if (is_free_buddy_page(p)) { > - if (take_page_off_buddy(p)) { > - page_ref_inc(p); > - res =3D MF_RECOVERED; > - } else { > - /* We lost the race, try again */ > - if (retry) { > - ClearPageHWPoison(p); > - retry =3D false; > - goto try_again; > - } > - res =3D MF_FAILED; > - } > - res =3D action_result(pfn, MF_MSG_BUDDY, = res); > + res =3D get_hwpoison_page(p, flags); > + if (!res) { > + if (is_free_buddy_page(p)) { > + if (take_page_off_buddy(p)) { > + page_ref_inc(p); > + res =3D MF_RECOVERED; > } else { > - res =3D action_result(pfn, MF_MSG_KERNEL_= HIGH_ORDER, MF_IGNORED); > + /* We lost the race, try again */ > + if (retry) { > + ClearPageHWPoison(p); > + retry =3D false; > + goto try_again; > + } > + res =3D MF_FAILED; > } > - goto unlock_mutex; > - } else if (res < 0) { > - res =3D action_result(pfn, MF_MSG_GET_HWPOISON, M= F_IGNORED); > - goto unlock_mutex; > + res =3D action_result(pfn, MF_MSG_BUDDY, res); > + } else { > + res =3D action_result(pfn, MF_MSG_KERNEL_HIGH_ORD= ER, MF_IGNORED); > } > + goto unlock_mutex; > + } else if (res < 0) { > + res =3D action_result(pfn, MF_MSG_GET_HWPOISON, MF_IGNORE= D); > + goto unlock_mutex; > } > > folio =3D page_folio(p); > > Thanks. > . This makes sense to me. And it gets rid of the warning as well. Can you send a proper patch of this? Feel free to add Reviewed-by: Zi Yan Tested-by: Zi Yan to it. Thanks. -- Best Regards, Yan, Zi