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Tue, 14 Apr 2026 10:24:07 -0400 (EDT) From: "Kiryl Shutsemau (Meta)" To: Andrew Morton Cc: Peter Xu , David Hildenbrand , Lorenzo Stoakes , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , "Liam R . Howlett" , Zi Yan , Jonathan Corbet , Shuah Khan , Sean Christopherson , Paolo Bonzini , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, kvm@vger.kernel.org, "Kiryl Shutsemau (Meta)" Subject: [RFC, PATCH 06/12] userfaultfd: auto-resolve shmem and hugetlbfs minor faults in async mode Date: Tue, 14 Apr 2026 15:23:40 +0100 Message-ID: <20260414142354.1465950-7-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260414142354.1465950-1-kas@kernel.org> References: <20260414142354.1465950-1-kas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 68C2C40012 X-Stat-Signature: x3mdmccjzjmqejqwhyxa3s53rqbz11yi X-Rspamd-Server: rspam06 X-HE-Tag: 1776176649-699666 X-HE-Meta: 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 hvc7dsad slUZNoSk2z7e2xr7hKn5sZ+zir2VmuMfETh5YFecDgjhJCEaR+w3vVC6xUVjr/M+7kRZsGJCcSZbYc0a+HARM8kmyBUAneevNuml1aUiv21U/xzv2UCwwFb2JlX0l7W8A8HrfvfGVmUnlagrYnia83Fmsv7YNdWQ0GFqG5HbAW3kC1SgD+mXINrTanfsINeueOkOHWdOTS/XpEFE7cbGlMI6muJQpPpYe4zS3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When UFFD_FEATURE_MINOR_ASYNC is enabled, skip handle_userfault() in the shmem and hugetlbfs minor fault paths. The normal fault path installs the PTE from page cache directly. Signed-off-by: Kiryl Shutsemau (Meta) Assisted-by: Claude:claude-opus-4-6 --- mm/hugetlb.c | 3 ++- mm/shmem.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 327eaa4074d3..c10d2432768c 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -5847,7 +5847,8 @@ static vm_fault_t hugetlb_no_page(struct address_space *mapping, } /* Check for page in userfault range. */ - if (userfaultfd_minor(vma)) { + if (userfaultfd_minor(vma) && + !userfaultfd_minor_async(vma)) { folio_unlock(folio); folio_put(folio); /* See comment in userfaultfd_missing() block above */ diff --git a/mm/shmem.c b/mm/shmem.c index b40f3cd48961..ce47e77fc090 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2489,7 +2489,8 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index, fault_mm = vma ? vma->vm_mm : NULL; folio = filemap_get_entry(inode->i_mapping, index); - if (folio && vma && userfaultfd_minor(vma)) { + if (folio && vma && userfaultfd_minor(vma) && + !userfaultfd_minor_async(vma)) { if (!xa_is_value(folio)) folio_put(folio); *fault_type = handle_userfault(vmf, VM_UFFD_MINOR); -- 2.51.2