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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4548e6a6470sm20880966f8f.7.2026.05.11.02.02.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 02:03:02 -0700 (PDT) Date: Mon, 11 May 2026 05:02:57 -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 resend v6 13/30] mm: use __GFP_ZERO in vma_alloc_anon_folio_pmd 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: cVKDAaLsriMPJZ4D3wnf-e4doFTTyo6Z33TUb_rhXzI_1778490184 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: E6377A0009 X-Rspam-User: X-Stat-Signature: mgk6d4wf5m3sbpbm76tmxfwwwpk6uu3c X-HE-Tag: 1778490186-177693 X-HE-Meta: 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 EWit68aW ymgIwWI08SPWC+zdM1L+Zsq2L2Pn02K0oBUqe3/5mN6l5YjEvbvOJlsZoxyynYzo07DW7j21Xy2P/cMimzZWxktutzHX/Ue0UnO2ylU6J/ZAlZCFNznfwKx6L+qFbeIkf87DSms2jAIA7Y19dXtUkAvyCdkpyazfH/PZL/l19V7CxrIAj7XCFh/VapkDga2yz+j2o9JNnfW9W6mU+UPm8ahmExkrlCc2E39z+68yZlV/GJ/vaWmuj8tpVOo121kM5s/xcblOCF5NF+4Yn6pxNaW2DUB3VToD2zitOIinky8zp3Gmkl/GP6dZLb92Qqhw6A2X4K/E2pjKF3G6k24xU18bv6foari3TETU/0G9AfAPbFn8BK8ht6itkffdU8p5Q8kRo9cpt4seQAafcwdnteXuSDU1DRqZsu6FhaWAn/fwUEXtAIt28s5iHmW6UQTlleLMJ 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