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[80.230.25.45]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45da0a1aeafsm59910901f8f.23.2026.05.20.15.21.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2026 15:21:22 -0700 (PDT) Date: Wed, 20 May 2026 18:21:18 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: "David Hildenbrand (Arm)" , Jason Wang , Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= , Muchun Song , Oscar Salvador , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Hugh Dickins , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , virtualization@lists.linux.dev, linux-mm@kvack.org, Andrea Arcangeli Subject: [PATCH v8 10/37] mm: add folio_zero_user stub for configs without THP/HUGETLBFS Message-ID: <501f8a7a582a97011a23e3051f3d0999c66c10bc.1779315441.git.mst@redhat.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent folio_zero_user() is defined in mm/memory.c under CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS. A subsequent patch will call it from post_alloc_hook() for all user page zeroing, so configs without THP or HUGETLBFS will need a stub. Add a stub that uses clear_user_highpages() with aligned addr_hint. Without THP/HUGETLBFS, only order-0 user pages are allocated, so the locality optimization in the real folio_zero_user() (zero near the faulting address last) is not needed. This also matches what vma_alloc_zeroed_movable_folio currently does. Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 Assisted-by: cursor-agent:GPT-5.4-xhigh --- include/linux/mm.h | 2 ++ mm/memory.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index af23453e9dbd..d1e768dcda13 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -5070,6 +5070,8 @@ long copy_folio_from_user(struct folio *dst_folio, const void __user *usr_src, bool allow_pagefault); +#else /* !CONFIG_TRANSPARENT_HUGEPAGE && !CONFIG_HUGETLBFS */ +void folio_zero_user(struct folio *folio, unsigned long addr_hint); #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ #if MAX_NUMNODES > 1 diff --git a/mm/memory.c b/mm/memory.c index ea6568571131..02d3e53fc91b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -7546,6 +7546,15 @@ long copy_folio_from_user(struct folio *dst_folio, } #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ +#if !defined(CONFIG_TRANSPARENT_HUGEPAGE) && !defined(CONFIG_HUGETLBFS) +void folio_zero_user(struct folio *folio, unsigned long addr_hint) +{ + unsigned long base = ALIGN_DOWN(addr_hint, folio_size(folio)); + + clear_user_highpages(&folio->page, base, folio_nr_pages(folio)); +} +#endif + #if defined(CONFIG_SPLIT_PTE_PTLOCKS) && ALLOC_SPLIT_PTLOCKS static struct kmem_cache *page_ptl_cachep; -- MST