From nobody Fri Apr 3 22:39:19 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D1A03976AF for ; Mon, 23 Mar 2026 11:08:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774264083; cv=none; b=c4N5qAaBYA4og/8185yGUNEVNy746VoonEIJxclXs7Gdn1gGHcn7bXvuKHZ7cnGz0ujQ0guoLlfx74Hs/nKshOtpXjOhAO2nR2kYbOaZyf05Dx9YEg+9eLOAQ6wxOsmfsR+jJsyYchXdq2T3/iJXyI2OW3sKP+UYJpshKEua1c0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774264083; c=relaxed/simple; bh=pYGDGts/ZLGdMz7r6G85TOkydSqlBVuJbAFgquYRfTc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YuB/l4hpAwpvsn15qSX7quBSwKQ6fXy4LKft8d2VVgm/hoBOZGeqCmbdNTyFxJSqj4HIKyYLrHrfx4Kj1GzJ0Kz5UeFuFdi0Ukjf0tDH7v/4/5EUxNSlJsSjht4AU1H+mq0JRVqkGiU6Qug1CjEUGFDBLeOSC9tvJqVF14Bta34= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 8af4f47426a811f1a21c59e7364eecb8-20260323 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_EXISTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_BAD CIE_GOOD, CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU AMN_GOOD, ABX_BLACK, ABX_EXPLOIT, ABX_HEURISTIC, ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.11,REQID:409a51a1-cf5c-4f28-b00c-1f3fb4bec1bb,IP:20, URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:10 X-CID-INFO: VERSION:1.3.11,REQID:409a51a1-cf5c-4f28-b00c-1f3fb4bec1bb,IP:20,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:10 X-CID-META: VersionHash:89c9d04,CLOUDID:509e87f008c7a3d2379aab5affc109e8,BulkI D:260323190756MBG2A585,BulkQuantity:0,Recheck:0,SF:17|19|38|66|78|81|82|10 2|127|850|898,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bu lk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR: 0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 8af4f47426a811f1a21c59e7364eecb8-20260323 X-User: duanchenghao@kylinos.cn Received: from localhost.localdomain [(183.242.174.23)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 475137973; Mon, 23 Mar 2026 19:07:55 +0800 From: Chenghao Duan To: pasha.tatashin@soleen.com, rppt@kernel.org, pratyush@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: jianghaoran@kylinos.cn, Chenghao Duan Subject: [PATCH v2 3/4] mm/memfd_luo: remove unnecessary memset in zero-size memfd path Date: Mon, 23 Mar 2026 19:07:46 +0800 Message-Id: <20260323110747.193569-4-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260323110747.193569-1-duanchenghao@kylinos.cn> References: <20260323110747.193569-1-duanchenghao@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)) call in the zero-size file handling path is unnecessary because the allocation of the ser structure already uses the __GFP_ZERO flag, ensuring the memory is already zero-initialized. Reviewed-by: Pratyush Yadav Reviewed-by: Pasha Tatashin Reviewed-by: Mike Rapoport (Microsoft) Signed-off-by: Chenghao Duan --- mm/memfd_luo.c | 1 - 1 file changed, 1 deletion(-) diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c index 2a01eaff03c2..bf827e574bec 100644 --- a/mm/memfd_luo.c +++ b/mm/memfd_luo.c @@ -103,7 +103,6 @@ static int memfd_luo_preserve_folios(struct file *file, if (!size) { *nr_foliosp =3D 0; *out_folios_ser =3D NULL; - memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)); return 0; } =20 --=20 2.25.1