From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id E34B24331D; Mon, 13 Nov 2023 18:06:36 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 8B50940DDA; Mon, 13 Nov 2023 18:06:22 +0100 (CET) Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) by mails.dpdk.org (Postfix) with ESMTP id 50A4040A7F for ; Mon, 13 Nov 2023 18:06:19 +0100 (CET) Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-1cc68c1fac2so41235165ad.0 for ; Mon, 13 Nov 2023 09:06:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1699895178; x=1700499978; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=uxAfJ8vzwr1WQklSqEm+Tn8oVVCx3fo3M3Y1fw61Dbk=; b=oTBcDuzhKMfQ+zpnRFmbOpyFBqwDmhye+TW7gz1RjiKsvE4kRhmhZDbYImeud1gUeZ SuyP+xRn2S0d+b11VpiOlR0PFQE/U4zGL0SMPBwBXPQYJqdg3huP7/VAAHyIhKfYWHUJ aL8UnQ0slMBQ7+pU/UuX/Eb/RbT0S7pXyMBMXB4IKxIgleVMgy5k0wAYuWf3OvLl/Y/L hbFm2UbHoQ5nQkyxahlSl9fBZn4aGVO9pQzryyvgX8GJT31C1rjp+Hxn3WsLlqUQ7z/u UJoGod4kJ4df3+Qf8WU/RgvfsS7FAIIQFsMFwUIFg+Z7aL1+hF8BkwToT0AB8k54N+Ox 5Qpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699895178; x=1700499978; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=uxAfJ8vzwr1WQklSqEm+Tn8oVVCx3fo3M3Y1fw61Dbk=; b=XEFLTB6LvvwKVt0mf1De956ib5qilVSXHzt9oFSe4cAfM5Ns6FW5RlGpomQOvHKTS5 0QVOAzB3nhv8RadkvWYGCnH4aHu+sIthWpuazNkWjhwWc2Ez0eIJvRiYD+nF5Z/WSx++ Ll9g+f3FyWMcMnqkhssDiuHGad2ZN1XsKO1slRhuH0a+2KRljPSA/ohwPipRWgGekKqT 7bFuj6gFw8lmYCTOjybbGOlE9cLKFdrRthBdugPytu0JUDMma1lb9XD1UgANfCZ9o11x yn4eWpR7pj2yM2kWMzCAes5RVb91NGb+hZMqkutQa+WW9uhOEsuIfdOO5FTgoOc3NUNe a3Lw== X-Gm-Message-State: AOJu0YxlYk0sVrJTKaWnoaxPfc6iYTxi1RE4WApWo4Vcsrhy/NsROgIl /HYERJv2To2VsLIaKbSWNDn3oDxz1Lq6jDRg2MU= X-Google-Smtp-Source: AGHT+IFSev4AIALLL5RjGSCN3tKRu0FNAqquV/Bm1UPyo1InUaV83jjm8OgAff4v7FydUo4Xpk1Nqw== X-Received: by 2002:a17:902:ab89:b0:1cc:5e1b:98b5 with SMTP id f9-20020a170902ab8900b001cc5e1b98b5mr116768plr.66.1699895178214; Mon, 13 Nov 2023 09:06:18 -0800 (PST) Received: from hermes.local (204-195-123-141.wavecable.com. [204.195.123.141]) by smtp.gmail.com with ESMTPSA id l4-20020a170902eb0400b001c61901ed2esm4232051plb.219.2023.11.13.09.06.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Nov 2023 09:06:17 -0800 (PST) From: Stephen Hemminger To: dev@dpdk.org Cc: Stephen Hemminger , =?UTF-8?q?Morten=20Br=C3=B8rup?= , Tyler Retzlaff Subject: [PATCH v2 3/3] eal: replace out of bounds VLA with static_assert Date: Mon, 13 Nov 2023 09:06:05 -0800 Message-Id: <20231113170605.408281-4-stephen@networkplumber.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231113170605.408281-1-stephen@networkplumber.org> References: <20231111172153.57461-1-stephen@networkplumber.org> <20231113170605.408281-1-stephen@networkplumber.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Both Gcc, clang and MSVC have better way to do compile time assertions rather than using out of bounds array access. The old method would fail if -Wvla is enabled because compiler can't determine size in that code. Also, the use of new _Static_assert will catch broken code that is passing non-constant expression to RTE_BUILD_BUG_ON(). Signed-off-by: Stephen Hemminger Acked-by: Morten Brørup Acked-by: Tyler Retzlaff --- lib/eal/include/rte_common.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/eal/include/rte_common.h b/lib/eal/include/rte_common.h index c1ba32d00e47..bea7c0e57d5e 100644 --- a/lib/eal/include/rte_common.h +++ b/lib/eal/include/rte_common.h @@ -16,6 +16,7 @@ extern "C" { #endif +#include #include #include @@ -495,7 +496,7 @@ rte_is_aligned(const void * const __rte_restrict ptr, const unsigned int align) /** * Triggers an error at compilation time if the condition is true. */ -#define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) +#define RTE_BUILD_BUG_ON(condition) static_assert(!(condition), #condition) /*********** Cache line related macros ********/ -- 2.39.2