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Mon, 08 Jun 2026 01:36:21 -0700 (PDT) X-Received: by 2002:a05:600c:4e4b:b0:490:bfda:7d7e with SMTP id 5b1f17b1804b1-490c258999amr250328155e9.3.1780907780459; Mon, 08 Jun 2026 01:36:20 -0700 (PDT) Received: from redhat.com ([31.152.37.159]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490bc3918fcsm427602815e9.3.2026.06.08.01.36.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2026 01:36:19 -0700 (PDT) Date: Mon, 8 Jun 2026 04:36:02 -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 v10 10/37] mm: add folio_zero_user stub for configs without THP/HUGETLBFS Message-ID: <60d48e3c6f03238f385cdb8e48f6d8ffd4cff387.1780906288.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 2.51.2.2891.g4157995a80.dirty 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 --- mm/folio_zero.h | 18 ++++++++++++++++++ mm/page_alloc.c | 1 + 2 files changed, 19 insertions(+) create mode 100644 mm/folio_zero.h diff --git a/mm/folio_zero.h b/mm/folio_zero.h new file mode 100644 index 000000000000..c135b3a34da8 --- /dev/null +++ b/mm/folio_zero.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef MM_FOLIO_ZERO_H +#define MM_FOLIO_ZERO_H + +#include + +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) +void folio_zero_user(struct folio *folio, unsigned long addr_hint); +#else +static inline 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 + +#endif /* MM_FOLIO_ZERO_H */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6d3f284c607d..0943ab724032 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -17,6 +17,7 @@ #include #include #include +#include "folio_zero.h" #include #include #include -- MST