From nobody Thu Apr 2 23:43:17 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 023F03BE17F for ; Thu, 26 Mar 2026 08:48:02 +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=1774514884; cv=none; b=VggyuTbvFlFaUJsJeJ7YEkZKbxh6yHkEtUxvKhJcKXPf2mYmMb3WsDoSOjnLzTkTPJU9uhHG9uU1nLgZiAvmw5Q7tvqAFH+2jKses97NYgxH652FS4E3h/GaCXnAkG9XruKPGYt/lxUXajIHVmmNCAADs6+v8Nju9hyV+xIQy+s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774514884; c=relaxed/simple; bh=pYGDGts/ZLGdMz7r6G85TOkydSqlBVuJbAFgquYRfTc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HoTMswGPP/T1ItroYYeIG/bdX1VWcIAMpBtLmrQ3wIlhTuf3TQ/YdOHJdvEWvDpqheXyy5vJc6PHQ5b/8NqpEnmgRv8JnW2czpFhULbdDaB0rkxmyoDYOGhM4p/laMk9T3/Tkc/44OkjI9IBsNQulRUGp0PTKGnS8J3mzos5Cb4= 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: 7cb80e4c28f011f1a21c59e7364eecb8-20260326 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, 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_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.11,REQID:0b074cf4-d6f7-4d98-9f07-dcf0e6a6e8b1,IP:10, URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:0 X-CID-INFO: VERSION:1.3.11,REQID:0b074cf4-d6f7-4d98-9f07-dcf0e6a6e8b1,IP:10,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:0 X-CID-META: VersionHash:89c9d04,CLOUDID:4c240a192d90b45019c2cb6f8b32788e,BulkI D:260323190756MBG2A585,BulkQuantity:2,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:41,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: 7cb80e4c28f011f1a21c59e7364eecb8-20260326 X-User: duanchenghao@kylinos.cn Received: from localhost.localdomain [(183.242.174.21)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 1835242107; Thu, 26 Mar 2026 16:47:57 +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, duanchenghao@kylinos.cn Subject: [PATCH v3 3/7] mm/memfd_luo: remove unnecessary memset in zero-size memfd path Date: Thu, 26 Mar 2026 16:47:23 +0800 Message-Id: <20260326084727.118437-4-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260326084727.118437-1-duanchenghao@kylinos.cn> References: <20260326084727.118437-1-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