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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e8f3f5174sm40737105e9.5.2026.05.12.14.06.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 14:06:26 -0700 (PDT) Date: Tue, 12 May 2026 17:06:22 -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 v7 14/31] mm: use __GFP_ZERO in alloc_anon_folio Message-ID: References: MIME-Version: 1.0 In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: BdK3Q2-ji1FLs8nQEAeYFgwfwEgXUxUscCW8gKqX0D4_1778619988 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Queue-Id: D44794000B X-Rspamd-Server: rspam06 X-Stat-Signature: zjjbtqfn9seddk7p31c9xgn43mkh7mey X-HE-Tag: 1778619990-577458 X-HE-Meta: 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 jiwOcvfA u4UWbP/PCTcBCJ0tEj/V1UHYXqk7/31n8uWnn4UHEuua8ftXGab2+GnygdY1SzRNc/JuAORgzPWxgqf7kpj2rMXc8EaJ6jT/pre0oub4+OHvQvPvDdAWxsqG4DQewpUcPBlsqN09tIcdL73dwui6Cz+GnQSXC14d/7ZyAyG7RfSzbr0ktFX8/Nq4Ww0FsJST+caGElo4AWB/7BuUMVXzNWbid0O5oG4oSlzfW70rJmX6yfApDAFXtDe+VyMBUs/DV2LG1zVSjartTiss/fTZ9b+NP4mp+L12e0wN3Ew/OxTVTeiex5LriZK8jkVtxu9Ha+LVadqUwxLMqmg6GYM9oRz0wewk/0HNcpONi0xzI3v8opD4CbEZk3YrgcZTayF+S7wLn/czsQHYd4XqsUW11wec2ZQTZSPT6MJc225zIWGprwqg4+d5tcmSlKl7xjNG3D2g4qoCMU3xuwXZshadDzHHTig== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Convert alloc_anon_folio() to pass __GFP_ZERO instead of zeroing at the callsite. post_alloc_hook uses the fault address passed through vma_alloc_folio for cache-friendly zeroing. Signed-off-by: Michael S. Tsirkin Reviewed-by: Gregory Price Assisted-by: Claude:claude-opus-4-6 --- mm/memory.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 74523bc00d8a..f3f1bc66366d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5249,7 +5249,7 @@ static struct folio *alloc_anon_folio(struct vm_fault *vmf) goto fallback; /* Try allocating the highest of the remaining orders. */ - gfp = vma_thp_gfp_mask(vma); + gfp = vma_thp_gfp_mask(vma) | __GFP_ZERO; while (orders) { folio = vma_alloc_folio(gfp, order, vma, vmf->address); if (folio) { @@ -5259,15 +5259,6 @@ static struct folio *alloc_anon_folio(struct vm_fault *vmf) goto next; } folio_throttle_swaprate(folio, gfp); - /* - * When a folio is not zeroed during allocation - * (__GFP_ZERO not used) or user folios require special - * handling, folio_zero_user() is used to make sure - * that the page corresponding to the faulting address - * will be hot in the cache after zeroing. - */ - if (user_alloc_needs_zeroing()) - folio_zero_user(folio, vmf->address); return folio; } next: -- MST