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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3229C433EF for ; Sun, 24 Jul 2022 22:40:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231876AbiGXWkC (ORCPT ); Sun, 24 Jul 2022 18:40:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229618AbiGXWkA (ORCPT ); Sun, 24 Jul 2022 18:40:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C1F951056B for ; Sun, 24 Jul 2022 15:39:59 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 41E0D611F1 for ; Sun, 24 Jul 2022 22:39:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8655C3411E; Sun, 24 Jul 2022 22:39:57 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="OIo+gX7r" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1658702396; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qwwPwwf8qoP83WuKgLNvp+yCb0Gwetm9WwYQMbMcL3s=; b=OIo+gX7rmSX+g39zbesRVfqjC3U//gxNk03U5YiB9zk6EAq9kmTtoe3uq4kVaJgNBzXeDK 0DRtPPMa5EZoC/945dYKIwf5qw8QMJnDe3SU5eQpOzyLWMy0/WGp5Dpp5BJlrgzIs8fROj 75U711KkfeHRPQPuZVtgQ0ZL7/uilTA= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 0f3c01f5 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Sun, 24 Jul 2022 22:39:55 +0000 (UTC) Date: Mon, 25 Jul 2022 00:39:53 +0200 From: "Jason A. Donenfeld" To: kernel test robot , ardb@kernel.org Cc: "Justin M. Forbes" , llvm@lists.linux.dev, kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , "Jason A. Donenfeld" Subject: Re: [linux-stable-rc:linux-5.15.y 6874/8723] arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC Message-ID: References: <202207250449.BYMZbIA2-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <202207250449.BYMZbIA2-lkp@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Ard, On Mon, Jul 25, 2022 at 04:14:48AM +0800, kernel test robot wrote: > All warnings (new ones prefixed by >>): > > >> arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC [-W#warnings] > #warning This code requires at least version 4.6 of GCC > ^ > 1 warning generated. > > > vim +30 arch/arm/lib/xor-neon.c > > 01956597cbc46d Ard Biesheuvel 2013-05-17 16 > 01956597cbc46d Ard Biesheuvel 2013-05-17 17 /* > 01956597cbc46d Ard Biesheuvel 2013-05-17 18 * Pull in the reference implementations while instructing GCC (through > 01956597cbc46d Ard Biesheuvel 2013-05-17 19 * -ftree-vectorize) to attempt to exploit implicit parallelism and emit > 01956597cbc46d Ard Biesheuvel 2013-05-17 20 * NEON instructions. > 01956597cbc46d Ard Biesheuvel 2013-05-17 21 */ > 01956597cbc46d Ard Biesheuvel 2013-05-17 22 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) > 01956597cbc46d Ard Biesheuvel 2013-05-17 23 #pragma GCC optimize "tree-vectorize" > 01956597cbc46d Ard Biesheuvel 2013-05-17 24 #else > 01956597cbc46d Ard Biesheuvel 2013-05-17 25 /* > 01956597cbc46d Ard Biesheuvel 2013-05-17 26 * While older versions of GCC do not generate incorrect code, they fail to > 01956597cbc46d Ard Biesheuvel 2013-05-17 27 * recognize the parallel nature of these functions, and emit plain ARM code, > 01956597cbc46d Ard Biesheuvel 2013-05-17 28 * which is known to be slower than the optimized ARM code in asm-arm/xor.h. > 01956597cbc46d Ard Biesheuvel 2013-05-17 29 */ > 01956597cbc46d Ard Biesheuvel 2013-05-17 @30 #warning This code requires at least version 4.6 of GCC > 01956597cbc46d Ard Biesheuvel 2013-05-17 31 #endif > 01956597cbc46d Ard Biesheuvel 2013-05-17 32 Does this file need a depends on ≥4.6 thing in Kconfig? Or is something else happening here since 4.6 isn't even supported by the kernel these days? Jason