From patchwork Thu Feb 27 13:37:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 230260 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=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 84449C54FEF for ; Thu, 27 Feb 2020 14:32:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4D38824656 for ; Thu, 27 Feb 2020 14:32:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582813922; bh=4Q9zxIWr3nzH1lCkmXbXCZriRxQ09zVPUbdUTtpjbjc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=XazdaCLAOzMk1M0Csr9biHPpC2KQhVYGSY4iKobw+hCdCKFBgQIIUa+SOT07UKaKV IGYKNi1xmKYap0F0U3BDXIyiLnMwxDtJBnXyp8lCsX6/k9JgU4JhGC35OD024QT60e kdTFnk9Gjlkd0oawlH2cD6RfDjdnNhyds4Uie7e0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732678AbgB0OCi (ORCPT ); Thu, 27 Feb 2020 09:02:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:37328 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733170AbgB0OCh (ORCPT ); Thu, 27 Feb 2020 09:02:37 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4543A20578; Thu, 27 Feb 2020 14:02:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582812156; bh=4Q9zxIWr3nzH1lCkmXbXCZriRxQ09zVPUbdUTtpjbjc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GCswms/94mMBOlbwFEGK7opSydTkzR1SfUiglRZ8CDCdKY+aNVLxnR+cj14HRmAMk rUXyRjon0ZkRe7Xle+cD9SSmRhZSLVd+nmvRsxwlfvHN67yxB84dcmTXDlmMCIan/O gEEDiSq8oGu1Ny3NQjvtZ4mEIKcCJoOOiO1//WQo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christian Borntraeger , Nathan Chancellor , Vasily Gorbik Subject: [PATCH 4.14 237/237] s390/mm: Explicitly compare PAGE_DEFAULT_KEY against zero in storage_key_init_range Date: Thu, 27 Feb 2020 14:37:31 +0100 Message-Id: <20200227132313.499491929@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200227132255.285644406@linuxfoundation.org> References: <20200227132255.285644406@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nathan Chancellor commit 380324734956c64cd060e1db4304f3117ac15809 upstream. Clang warns: In file included from ../arch/s390/purgatory/purgatory.c:10: In file included from ../include/linux/kexec.h:18: In file included from ../include/linux/crash_core.h:6: In file included from ../include/linux/elfcore.h:5: In file included from ../include/linux/user.h:1: In file included from ../arch/s390/include/asm/user.h:11: ../arch/s390/include/asm/page.h:45:6: warning: converting the result of '<<' to a boolean always evaluates to false [-Wtautological-constant-compare] if (PAGE_DEFAULT_KEY) ^ ../arch/s390/include/asm/page.h:23:44: note: expanded from macro 'PAGE_DEFAULT_KEY' #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) ^ 1 warning generated. Explicitly compare this against zero to silence the warning as it is intended to be used in a boolean context. Fixes: de3fa841e429 ("s390/mm: fix compile for PAGE_DEFAULT_KEY != 0") Link: https://github.com/ClangBuiltLinux/linux/issues/860 Link: https://lkml.kernel.org/r/20200214064207.10381-1-natechancellor@gmail.com Acked-by: Christian Borntraeger Signed-off-by: Nathan Chancellor Signed-off-by: Vasily Gorbik Signed-off-by: Greg Kroah-Hartman --- arch/s390/include/asm/page.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -42,7 +42,7 @@ void __storage_key_init_range(unsigned l static inline void storage_key_init_range(unsigned long start, unsigned long end) { - if (PAGE_DEFAULT_KEY) + if (PAGE_DEFAULT_KEY != 0) __storage_key_init_range(start, end); }