From mboxrd@z Thu Jan 1 00:00:00 1970 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=-14.3 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,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 91BE7C3404E for ; Wed, 19 Feb 2020 04:54:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 55A1B24656 for ; Wed, 19 Feb 2020 04:54:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="J/JOa0IR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 55A1B24656 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E530A6B000C; Tue, 18 Feb 2020 23:54:37 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id DDA396B000D; Tue, 18 Feb 2020 23:54:37 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CCC896B000E; Tue, 18 Feb 2020 23:54:37 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0006.hostedemail.com [216.40.44.6]) by kanga.kvack.org (Postfix) with ESMTP id B035B6B000C for ; Tue, 18 Feb 2020 23:54:37 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 35AFD2C2E for ; Wed, 19 Feb 2020 04:54:37 +0000 (UTC) X-FDA: 76505660994.08.wish29_b2b1ccfdc92a X-HE-Tag: wish29_b2b1ccfdc92a X-Filterd-Recvd-Size: 5079 Received: from mail-ot1-f68.google.com (mail-ot1-f68.google.com [209.85.210.68]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Wed, 19 Feb 2020 04:54:36 +0000 (UTC) Received: by mail-ot1-f68.google.com with SMTP id j16so21947158otl.1 for ; Tue, 18 Feb 2020 20:54:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=jXMSq1G5rPTXUEP5geAUCtTmXJBdNGAIZfUMzXa3xpk=; b=J/JOa0IRUSQzS/wfLNZGUESDgz1LVTCC8zLL4GgLJN3TkqqBKqbwTtKzVV+LKQA/ow Ctahh1xRv+Cjvv8ps3OzOLyz0wsgaXJYVIUktvu7gxbtjoVSvKOjLPBf2kHlscZCiHiN rabnjLDU1PUlEMJAtn6k1Zde4XJg6WcwaOUl2cBKDUlCkAiaN0aRXU7B1+fST7KgxUc8 plxxVegSLtHSF2Kpo7GnyPEjvBEqw4jusa3DIb+rb9MEpwvSQsLaH834lRk7M/UNPdnw AMNyVfRD1iwflZr8McSRr6QzaZzvWMNXySOrrLThSzklcMr35jGETEW9goqvDy0a1lYR 8tPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=jXMSq1G5rPTXUEP5geAUCtTmXJBdNGAIZfUMzXa3xpk=; b=IE7Oc++SxtLaXQzQOksCVULsfFU/14HL1+FRccgNLG+qqTIVlfnOxIPimys8A3S1UN TCUJFhv0XdnrG2QMcNvZMr2h3UHEYqhjoOofU/5I5H0wYLC1auja3CVHiQSox3g4fF2q nlzbtRUvjPDQXZoKLUjNiU/q2TCwGWWEU7ZF4K0GdD98/L3ROAsuJtubmRtWdLk/TAB1 rFCbzaF/V4ES3DrT84A/LrasRW+U/IyYK0cKvu7t6zW9+cJaBF4p7xh+N8IlYwYFWufI d1Wjc+IBQRx8s7pj6HAOpITx0uqUIn16Hf0lol0SN47MHvCvEQ+uqHsHGCz+JykcrPoz KWPQ== X-Gm-Message-State: APjAAAUJmKSI6y0GDd3tx5QVxqCyJKluW2s6SimObIAals4dIvN2TTaZ JHWcZ+HUljMqCfraD/Nk3Zw= X-Google-Smtp-Source: APXvYqzGvAZO0x9jw5WmNLprzgTxW6R8oyixD2CIDl8AUW+oyej/NaXt3g2Xbd0NMuq30pnEIYLxNQ== X-Received: by 2002:a9d:6415:: with SMTP id h21mr19176451otl.152.1582088076125; Tue, 18 Feb 2020 20:54:36 -0800 (PST) Received: from localhost.localdomain ([2604:1380:4111:8b00::1]) by smtp.gmail.com with ESMTPSA id c7sm288894otn.81.2020.02.18.20.54.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Feb 2020 20:54:35 -0800 (PST) From: Nathan Chancellor To: Masahiro Yamada , Michal Marek , Arnd Bergmann , Steven Rostedt , Ingo Molnar , Jason Baron , Catalin Marinas , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, clang-built-linux@googlegroups.com, Nathan Chancellor Subject: [PATCH 5/6] mm: kmemleak: Wrap section comparison in kmemleak_init with COMPARE_SECTIONS Date: Tue, 18 Feb 2020 21:54:22 -0700 Message-Id: <20200219045423.54190-6-natechancellor@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200219045423.54190-1-natechancellor@gmail.com> References: <20200219045423.54190-1-natechancellor@gmail.com> MIME-Version: 1.0 X-Patchwork-Bot: notify Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Clang warns: ../mm/kmemleak.c:1950:28: warning: array comparison always evaluates to a constant [-Wtautological-compare] if (__start_ro_after_init < _sdata || __end_ro_after_init > _edat= a) ^ ../mm/kmemleak.c:1950:60: warning: array comparison always evaluates to a constant [-Wtautological-compare] if (__start_ro_after_init < _sdata || __end_ro_after_init > _edat= a) ^ 2 warnings generated. These are not true arrays, they are linker defined symbols, which are just addresses so there is not a real issue here. Use the COMPARE_SECTIONS macro to silence this warning by casting the linker defined symbols to unsigned long, which keeps the logic the same. Link: https://github.com/ClangBuiltLinux/linux/issues/765 Signed-off-by: Nathan Chancellor --- mm/kmemleak.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index aa6832432d6a..e27655526ba7 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -1952,7 +1952,8 @@ void __init kmemleak_init(void) create_object((unsigned long)__bss_start, __bss_stop - __bss_start, KMEMLEAK_GREY, GFP_ATOMIC); /* only register .data..ro_after_init if not within .data */ - if (__start_ro_after_init < _sdata || __end_ro_after_init > _edata) + if (COMPARE_SECTIONS(__start_ro_after_init, <, _sdata) || + COMPARE_SECTIONS(__end_ro_after_init, >, _edata)) create_object((unsigned long)__start_ro_after_init, __end_ro_after_init - __start_ro_after_init, KMEMLEAK_GREY, GFP_ATOMIC); --=20 2.25.1