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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Rspamd-Server: rspam11 X-Stat-Signature: txac7rqymgfyhyiawsym6mg3ojxk9fpo X-Rspam-User: X-Rspamd-Queue-Id: A53181C0005 X-HE-Tag: 1769446044-411650 X-HE-Meta: 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 62oNMXMc 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 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: From: Patrick Roy =0A= =0A= This drops an optimization in gup_fast_folio_allowed() where=0A= secretmem_mapping() was only called if CONFIG_SECRETMEM=3Dy. secretmem is= =0A= enabled by default since commit b758fe6df50d ("mm/secretmem: make it on=0A= by default"), so the secretmem check did not actually end up elided in=0A= most cases anymore anyway.=0A= =0A= This is in preparation of the generalization of handling mappings where=0A= direct map entries of folios are set to not present. Currently,=0A= mappings that match this description are secretmem mappings=0A= (memfd_secret()). Later, some guest_memfd configurations will also fall=0A= into this category.=0A= =0A= Signed-off-by: Patrick Roy =0A= Acked-by: Vlastimil Babka =0A= Acked-by: David Hildenbrand (Red Hat) =0A= Signed-off-by: Nikita Kalyazin =0A= ---=0A= mm/gup.c | 11 +----------=0A= 1 file changed, 1 insertion(+), 10 deletions(-)=0A= =0A= diff --git a/mm/gup.c b/mm/gup.c=0A= index 95d948c8e86c..9cad53acbc99 100644=0A= --- a/mm/gup.c=0A= +++ b/mm/gup.c=0A= @@ -2739,7 +2739,6 @@ static bool gup_fast_folio_allowed(struct folio *foli= o, unsigned int flags)=0A= {=0A= bool reject_file_backed =3D false;=0A= struct address_space *mapping;=0A= - bool check_secretmem =3D false;=0A= unsigned long mapping_flags;=0A= =0A= /*=0A= @@ -2751,14 +2750,6 @@ static bool gup_fast_folio_allowed(struct folio *fol= io, unsigned int flags)=0A= reject_file_backed =3D true;=0A= =0A= /* We hold a folio reference, so we can safely access folio fields. */=0A= -=0A= - /* secretmem folios are always order-0 folios. */=0A= - if (IS_ENABLED(CONFIG_SECRETMEM) && !folio_test_large(folio))=0A= - check_secretmem =3D true;=0A= -=0A= - if (!reject_file_backed && !check_secretmem)=0A= - return true;=0A= -=0A= if (WARN_ON_ONCE(folio_test_slab(folio)))=0A= return false;=0A= =0A= @@ -2800,7 +2791,7 @@ static bool gup_fast_folio_allowed(struct folio *foli= o, unsigned int flags)=0A= * At this point, we know the mapping is non-null and points to an=0A= * address_space object.=0A= */=0A= - if (check_secretmem && secretmem_mapping(mapping))=0A= + if (secretmem_mapping(mapping))=0A= return false;=0A= /* The only remaining allowed file system is shmem. */=0A= return !reject_file_backed || shmem_mapping(mapping);=0A= -- =0A= 2.50.1=0A= =0A=