From patchwork Tue May 25 11:05:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Fitzgerald X-Patchwork-Id: 12278515 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10071C2B9F8 for ; Tue, 25 May 2021 11:07:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E59A86141B for ; Tue, 25 May 2021 11:07:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231347AbhEYLJS (ORCPT ); Tue, 25 May 2021 07:09:18 -0400 Received: from mx0a-001ae601.pphosted.com ([67.231.149.25]:9778 "EHLO mx0b-001ae601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S231321AbhEYLJP (ORCPT ); Tue, 25 May 2021 07:09:15 -0400 Received: from pps.filterd (m0077473.ppops.net [127.0.0.1]) by mx0a-001ae601.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 14PAwx1e026449; Tue, 25 May 2021 06:05:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cirrus.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=PODMain02222019; bh=SYnmenIZ9zgOw2CHiZgZxkwihTFmJdiQtcHas3VnnSA=; b=PtZq7/mzPHfHv95s+p5Nz9Y3t4ALom5C9tO5ac19XgdfsJ/oj7zJhrIXVafUmz/U2k2t 54A5VicBtP+oLTBNZLLMmwTBTYuoo4sLg5dZcnBPB2RHYonEdKv1AX6jpaFeUDN0z8Fu OrKNuH30cEwfLhm20uFp1pjPSMzBhnvzr5LYeYnH3PK9mDaAgFlMlhb/IC50p+Iwbxel M1FSRU3uzdfaTwaFYAGy8z6XbGW4qzOwnz2xT+uTIZ0yMc944bDeY57us9vYYYhWXqvQ ubZNOKb5ram8LJfEnwapUh8k3xpmC4LKPd5I/e2up5VXzrvihYr+F/bjp+8VQ4ItIgMU 9g== Received: from ediex02.ad.cirrus.com ([87.246.76.36]) by mx0a-001ae601.pphosted.com with ESMTP id 38r7ck9hjj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Tue, 25 May 2021 06:05:49 -0500 Received: from EDIEX01.ad.cirrus.com (198.61.84.80) by EDIEX02.ad.cirrus.com (198.61.84.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Tue, 25 May 2021 12:05:47 +0100 Received: from ediswmail.ad.cirrus.com (198.61.86.93) by EDIEX01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server id 15.1.2242.4 via Frontend Transport; Tue, 25 May 2021 12:05:47 +0100 Received: from AUSNPC0LSNW1-debian.cirrus.com (AUSNPC0LSNW1.ad.cirrus.com [198.61.64.127]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id A47AE11D6; Tue, 25 May 2021 11:05:46 +0000 (UTC) From: Richard Fitzgerald To: , , , , , , , CC: , , , Richard Fitzgerald Subject: [PATCH v2 0/2] Fix truncation warnings from building test_scanf.c Date: Tue, 25 May 2021 12:05:44 +0100 Message-ID: <20210525110546.6223-1-rf@opensource.cirrus.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Proofpoint-GUID: Ye2n17YzxIR7eOQ0pvihzd0q99S_Hm3v X-Proofpoint-ORIG-GUID: Ye2n17YzxIR7eOQ0pvihzd0q99S_Hm3v X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=517 adultscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 mlxscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250070 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The kernel test robot is reporting truncation warnings when building lib/test_scanf.c: 1) lib/test_scanf.c:250:9: sparse: sparse: cast truncates bits from constant value (ffff0001 becomes 1) Reported on several lines. 2) include/linux/prandom.h:114:45: sparse: sparse: cast truncates bits from constant value (4f2e5357408c3c09 becomes 408c3c09) (1) is caused by test_scanf.c using type_min() on an unsigned type. The truncation is expected but the use of type_min() on an unsigned is unnecessary because we know it is always 0. (2) is caused by prandom_seed_state() storing a modified u64 seed value into a u32 - sparse will warn that this causes a truncation. The two patches in this series fix these problems. Richard Fitzgerald (2): lib: test_scanf: Remove pointless use of type_min() with unsigned types random32: Fix implicit truncation warning in prandom_seed_state() include/linux/prandom.h | 2 +- lib/test_scanf.c | 13 ++++++------- 2 files changed, 7 insertions(+), 8 deletions(-)