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[2003:d8:2f31:700:3851:c66a:b6b9:3490]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-4532e25ec9fsm175719105e9.34.2025.06.17.08.44.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Jun 2025 08:44:01 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, nvdimm@lists.linux.dev, David Hildenbrand , Andrew Morton , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Dan Williams , Alistair Popple , Matthew Wilcox , Jan Kara , Alexander Viro , Christian Brauner , Zi Yan , Baolin Wang , Lorenzo Stoakes , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato Subject: [PATCH RFC 06/14] mm/huge_memory: support huge zero folio in vmf_insert_folio_pmd() Date: Tue, 17 Jun 2025 17:43:37 +0200 Message-ID: <20250617154345.2494405-7-david@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250617154345.2494405-1-david@redhat.com> References: <20250617154345.2494405-1-david@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: oiQky004ltuicRQz-vPYEoXnmk4AiW_mM9I7E9sA4ys_1750175042 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: 67A524000F X-Stat-Signature: dzqcgakyq7o4f3yymga1tt7nox8dpabz X-HE-Tag: 1750175045-353894 X-HE-Meta: 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 VnWsAVSS 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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: Just like we do for vmf_insert_page_mkwrite() -> ... -> insert_page_into_pte_locked(), support the huge zero folio. Signed-off-by: David Hildenbrand --- mm/huge_memory.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 1ea23900b5adb..92400f3baa9ff 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1418,9 +1418,11 @@ static vm_fault_t insert_pmd(struct vm_area_struct *vma, unsigned long addr, if (fop.is_folio) { entry = folio_mk_pmd(fop.folio, vma->vm_page_prot); - folio_get(fop.folio); - folio_add_file_rmap_pmd(fop.folio, &fop.folio->page, vma); - add_mm_counter(mm, mm_counter_file(fop.folio), HPAGE_PMD_NR); + if (!is_huge_zero_folio(fop.folio)) { + folio_get(fop.folio); + folio_add_file_rmap_pmd(fop.folio, &fop.folio->page, vma); + add_mm_counter(mm, mm_counter_file(fop.folio), HPAGE_PMD_NR); + } } else { entry = pmd_mkhuge(pfn_pmd(fop.pfn, prot)); entry = pmd_mkspecial(entry); -- 2.49.0