From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E357839231 for ; Wed, 7 Jun 2023 20:56:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6505EC4339B; Wed, 7 Jun 2023 20:56:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686171403; bh=QD6I+bCr+RV/71NDqpz6EaS9MABIMIitX+jkoggWWIs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e2r22vFDYr181f6AollGSEVchGN7WvqWB7Rhrw9Zb4T0sRZ5ix7AT/b0GNW5m0U8P ZHI21dg0W1nW9ijm2ZlB7oU02lXXTChOb1poxYRSkUAK5Qn+jqEaWJ6XvBqw3c+OMq gYmyr7+ko5CrT3sZJ9H5/7Whq2QxJJKc4LT1HaAk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Nick Desaulniers , Nathan Chancellor , Andrew Morton , Jason Baron , Linus Torvalds Subject: [PATCH 5.4 80/99] lib/dynamic_debug.c: use address-of operator on section symbols Date: Wed, 7 Jun 2023 22:17:12 +0200 Message-ID: <20230607200902.731741043@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607200900.195572674@linuxfoundation.org> References: <20230607200900.195572674@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Nathan Chancellor commit 8306b057a85ec07482da5d4b99d5c0b47af69be1 upstream. Clang warns: ../lib/dynamic_debug.c:1034:24: warning: array comparison always evaluates to false [-Wtautological-compare] if (__start___verbose == __stop___verbose) { ^ 1 warning generated. These are not true arrays, they are linker defined symbols, which are just addresses. Using the address of operator silences the warning and does not change the resulting assembly with either clang/ld.lld or gcc/ld (tested with diff + objdump -Dr). Suggested-by: Nick Desaulniers Signed-off-by: Nathan Chancellor Signed-off-by: Andrew Morton Acked-by: Jason Baron Link: https://github.com/ClangBuiltLinux/linux/issues/894 Link: http://lkml.kernel.org/r/20200220051320.10739-1-natechancellor@gmail.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- lib/dynamic_debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -1015,7 +1015,7 @@ static int __init dynamic_debug_init(voi int n = 0, entries = 0, modct = 0; int verbose_bytes = 0; - if (__start___verbose == __stop___verbose) { + if (&__start___verbose == &__stop___verbose) { pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); return 1; }