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 XbVs6hCw 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7 May 2026, at 14:08, Zi Yan wrote: > On 29 Apr 2026, at 23:29, Zi Yan wrote: > >> collapse_file() requires FSes supporting large folio with at least >> PMD_ORDER, so replace the READ_ONLY_THP_FOR_FS check with that. >> MADV_COLLAPSE ignores shmem huge config, so exclude the check for shme= m. >> >> While at it, replace VM_BUG_ON with VM_WARN_ON_ONCE. >> >> Add a helper function mapping_pmd_folio_support() for FSes supporting = large >> folio with at least PMD_ORDER. >> >> Signed-off-by: Zi Yan >> Reviewed-by: Lance Yang >> Reviewed-by: Baolin Wang >> --- >> include/linux/pagemap.h | 26 ++++++++++++++++++++++++++ >> mm/khugepaged.c | 10 ++++++++-- >> 2 files changed, 34 insertions(+), 2 deletions(-) >> >> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h >> index 1f50991b43e3b..1fed3414fe9b8 100644 >> --- a/include/linux/pagemap.h >> +++ b/include/linux/pagemap.h >> @@ -513,6 +513,32 @@ static inline bool mapping_large_folio_support(co= nst struct address_space *mappi >> return mapping_max_folio_order(mapping) > 0; >> } >> >> +/** >> + * mapping_pmd_folio_support() - Check if a mapping support PMD-sized= folio >> + * @mapping: The address_space >> + * >> + * Some file supports large folio but does not support as large as PM= D order. >> + * If a PMD-sized pagecache folio is attempted to be created on a fil= esystem, >> + * this check needs to be performed first. >> + * >> + * Return: true - PMD-sized folio is supported, false - PMD-sized fol= io is not >> + * supported. >> + */ >> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE >> +static inline bool mapping_pmd_folio_support(const struct address_spa= ce *mapping) >> +{ >> + /* AS_FOLIO_ORDER is only reasonable for pagecache folios */ >> + VM_WARN_ON_ONCE((unsigned long)mapping & FOLIO_MAPPING_ANON); >> + >> + return mapping_max_folio_order(mapping) >=3D PMD_ORDER; > > Hi Andrew, > > Can you help apply the fixup below? It addresses the concern raised by > Nico and Lance[1]. Thanks. > > [1] https://lore.kernel.org/all/aa778cfc-b7f8-4100-89bb-d2b2ef8e1138@re= dhat.com/ > I was missing a semicolon. Here is the right fixup. Sorry for the noise. =46rom fbd183f7528a3d0bdb421018af4aef45f6366682 Mon Sep 17 00:00:00 2001 From: Zi Yan Date: Thu, 7 May 2026 02:02:28 -0400 Subject: [PATCH] fix mapping_pmd_folio_support() to represent its exact meaning. Signed-off-by: Zi Yan --- include/linux/pagemap.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index c6a4ecd3d6ed1..41dbb55a47d8e 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -530,7 +530,8 @@ static inline bool mapping_pmd_folio_support(const st= ruct address_space *mapping /* AS_FOLIO_ORDER is only reasonable for pagecache folios */ VM_WARN_ON_ONCE((unsigned long)mapping & FOLIO_MAPPING_ANON); - return mapping_max_folio_order(mapping) >=3D PMD_ORDER; + return mapping_min_folio_order(mapping) <=3D PMD_ORDER && + mapping_max_folio_order(mapping) >=3D PMD_ORDER; } #else static inline bool mapping_pmd_folio_support(const struct address_space = *mapping) -- = 2.53.0 Best Regards, Yan, Zi