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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e702e5614sm174868625e9.9.2026.05.11.01.54.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 01:54:12 -0700 (PDT) Date: Mon, 11 May 2026 04:54:07 -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. 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Howlett" Subject: [PATCH v6 12/30] mm: use __GFP_ZERO in vma_alloc_anon_folio_pmd Message-ID: <709da61903c6e395ea51caa48eb5e5733d2f3d49.1778487000.git.mst@redhat.com> 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: QE8IE8f5o8PkGrZHWrArK2302RxV-v4J0mE4sOXoi68_1778489653 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 7494B1A0002 X-Rspam-User: X-Stat-Signature: gbeuommq361tpotp9tzd5dfgwtu34wdk X-HE-Tag: 1778489658-162262 X-HE-Meta: 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 dKTmOklZ e3nRnvt0aWpuZ3OUt3C1/u4MIiLDHK3fzDEDzhAAiEFpA52QqRI7dRv0Va7KzrgSi2QcWPDdWMYcIpMTqHKSfuwjoFFML7868Pq9tDfpyFZE4F2n2wUpe0XM4ceshaSb4qwpPn8LGU4LG9krSV5WsijT895VLpk3gKsVEavpcHnZL9L8rL6849ymmSouT/aNISqkUlAO48bLhWNGnxUBvOI7NBj3NycMb33lxVoyR6LSoIH5wNTTVw+75Zu5hj9Llcs6wru+HPNXKzDxN/p8IwvIiAIA5S/7cj1lsZsn3a1TupxWfezn+1mT0Ax5r6aOyHyq0w6mRBLb4G/HwAy8HJd5FgJrCYW1RtSPDSRMvUJJMBT1EcvRbxkEVV6sd+VVcUPVz3t/dCVsayHh9Zf9Lk0pCrGomYryB5mhzhHFB6eYLY0V14qekiSUPxfVu67gqjVHi Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Convert vma_alloc_anon_folio_pmd() 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 Assisted-by: Claude:claude-opus-4-6 --- mm/huge_memory.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d689e6491ddb..9845c920c29c 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1333,7 +1333,7 @@ EXPORT_SYMBOL_GPL(thp_get_unmapped_area); static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct *vma, unsigned long addr) { - gfp_t gfp = vma_thp_gfp_mask(vma); + gfp_t gfp = vma_thp_gfp_mask(vma) | __GFP_ZERO; const int order = HPAGE_PMD_ORDER; struct folio *folio; @@ -1356,14 +1356,6 @@ static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct *vma, } 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, addr); /* * The memory barrier inside __folio_mark_uptodate makes sure that * folio_zero_user writes become visible before the set_pmd_at() -- MST