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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jens Axboe , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Muchun Song , Oscar Salvador , Brendan Jackman , Johannes Weiner , linux-mm@kvack.org, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org Subject: Re: [RFC PATCH 3/5] mm/hugetlb: set large_rmappable on hugetlb and avoid deferred_list handling Date: Mon, 02 Feb 2026 12:11:45 -0500 X-Mailer: MailMate (2.0r6290) Message-ID: <21EACA83-C358-4FE7-BE2F-415A7EDC1485@nvidia.com> In-Reply-To: <5aefd2ea-8eba-49ed-bc21-f84dbab8cf3b@linux.alibaba.com> References: <20260130034818.472804-1-ziy@nvidia.com> <20260130034818.472804-4-ziy@nvidia.com> <5aefd2ea-8eba-49ed-bc21-f84dbab8cf3b@linux.alibaba.com> Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SJ0PR13CA0179.namprd13.prod.outlook.com (2603:10b6:a03:2c7::34) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 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 Vau4bd4N f4md5z9ma+7Gqy3V7bdG/3n98+FiHt35PoyU3xdHWEx8zKgYcRGFOfX+Y2Egkogrn1lgYZliB9Osq/Nn0ZQyCD81RShKnY9Vr81IqSD2wscLFmKF56IMPSl/kr466nxsPQO3LXumgA79VrzdCXIbLAJa+qb1PL237wDU2UGT87kqw8/3HeTSDtqWchtIz7NaQ2yIhE7rrxN+B1H6PllthFsfJ/uuJjprSSjLoBYNc4TqRezqGx/orzmGDGKsBlFhIpsxKOTx9qizp0MurwmVTvNbMpoCL2o70zFydx/v+6Ps8UEQzPgIs35VyIlO5C9XBpszb5Ady0XuyzU0Fe2o74ZVsFkM+ChVGXlDsPcmCzqjuLE3AXhU7BAj15w8xqKIeLOUa0fDJpa2YpwpNUcVOqNt8nnwlkErtruIm80jL/1GZnGKZfwlAgi0kow== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1 Feb 2026, at 22:59, Baolin Wang wrote: > On 1/30/26 11:48 AM, Zi Yan wrote: >> Commit f708f6970cc9 ("mm/hugetlb: fix kernel NULL pointer dereference = when >> migrating hugetlb folio") fixed a NULL pointer dereference when >> folio_undo_large_rmappable(), now folio_unqueue_deferred_list(), is us= ed on >> hugetlb to clear deferred_list. It cleared large_rmappable flag on hug= etlb. >> hugetlb is rmappable, thus clearing large_rmappable flag looks mislead= ing. >> Instead, reject hugetlb in folio_unqueue_deferred_list() to avoid the >> issue. >> >> This prepares for code separation of compound page and folio in a foll= ow-up >> commit. >> >> Signed-off-by: Zi Yan >> --- >> mm/hugetlb.c | 6 +++--- >> mm/hugetlb_cma.c | 2 +- >> mm/internal.h | 3 ++- >> 3 files changed, 6 insertions(+), 5 deletions(-) >> >> diff --git a/mm/hugetlb.c b/mm/hugetlb.c >> index 6e855a32de3d..7466c7bf41a1 100644 >> --- a/mm/hugetlb.c >> +++ b/mm/hugetlb.c >> @@ -1422,8 +1422,8 @@ static struct folio *alloc_gigantic_frozen_folio= (int order, gfp_t gfp_mask, >> if (hugetlb_cma_exclusive_alloc()) >> return NULL; >> - folio =3D (struct folio *)alloc_contig_frozen_pages(1 << order, gfp= _mask, >> - nid, nodemask); >> + folio =3D page_rmappable_folio(alloc_contig_frozen_pages(1 << order,= gfp_mask, >> + nid, nodemask)); >> return folio; >> } >> #else /* !CONFIG_ARCH_HAS_GIGANTIC_PAGE || !CONFIG_CONTIG_ALLOC */ >> @@ -1859,7 +1859,7 @@ static struct folio *alloc_buddy_frozen_folio(in= t order, gfp_t gfp_mask, >> if (alloc_try_hard) >> gfp_mask |=3D __GFP_RETRY_MAYFAIL; >> - folio =3D (struct folio *)__alloc_frozen_pages(gfp_mask, order, nid= , nmask); >> + folio =3D page_rmappable_folio(__alloc_frozen_pages(gfp_mask, order,= nid, nmask)); >> /* >> * If we did not specify __GFP_RETRY_MAYFAIL, but still got a >> diff --git a/mm/hugetlb_cma.c b/mm/hugetlb_cma.c >> index f83ae4998990..4245b5dda4dc 100644 >> --- a/mm/hugetlb_cma.c >> +++ b/mm/hugetlb_cma.c >> @@ -51,7 +51,7 @@ struct folio *hugetlb_cma_alloc_frozen_folio(int ord= er, gfp_t gfp_mask, >> if (!page) >> return NULL; >> - folio =3D page_folio(page); >> + folio =3D page_rmappable_folio(page); >> folio_set_hugetlb_cma(folio); >> return folio; >> } > > IIUC, this will break the semantics of the is_transparent_hugepage() an= d might trigger a split of a hugetlb folio, right? > > static inline bool is_transparent_hugepage(const struct folio *folio) > { > if (!folio_test_large(folio)) > return false; > > return is_huge_zero_folio(folio) || > folio_test_large_rmappable(folio); > } Oh, I missed this. I will check all folio_test_large_rmappable() callers and filter out hugetlb if necessary. Thank you for pointing this out. Best Regards, Yan, Zi