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 CE35C156968 for ; Thu, 6 Feb 2025 07:53:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738828439; cv=none; b=uJpeGAXYHPK6bc0XA54clDmy0fL67pqv2HGYvZsl8Pz+OpFAlqwhKZatwwmsY7v93Vi1KV54RBjex4URzu04dFdMh2RSEOYOzi7T5NTs7GDMAjAfMBlCKiZig/P2O++VWAuplWqgn/OwIFVXOigTjRYuZ+xAx2Yk6vXpTzuquvE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738828439; c=relaxed/simple; bh=qVbmRl3cdmmI1b8t2RCDUnEVbUnVsISBeIGbzapT6ps=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=IYQpwyHjKTdnN/wtwtJO1CYSCk0+bKY92ryvruRiCEk74U7LDp4aAK4/P2wLVHoAHt1JGPfBNR8ML2ech1LpEDBEUg/F/Y/TXA4lB2SxSYWjbdFUd0FtwEkPnaBvWbb6Zw7laPcvdIS/Dk9ke9eESMFLSU3QWGSAdpbAJKmXG1E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OON7aS8d; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OON7aS8d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF622C4CEDD; Thu, 6 Feb 2025 07:53:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738828439; bh=qVbmRl3cdmmI1b8t2RCDUnEVbUnVsISBeIGbzapT6ps=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=OON7aS8dnpRLLpRzCL5b5SVUR3oLGzWTqkr3cb0zrUx21GoMipT1qq0xEy409+kyy XzIxmxd6zbgUxYzV8oLuE0bkTkdcROc8DDgwT8TYFLPD+w7itHjD3YKHyamGAfFwRU dw0+I7neEzKdrw4URHRzR3mRpjCju9os7x0Fy62vu54SsQF4PQywo4YPF02ALPiiJi VZ491JXTQ9gGy7hkBhTbpJgBIiFwy9n8JbwvQr3i7D+2xZtZxJLOSPPpKQ8P72hP1+ BIhdb8tBMeP85ZrdmZ5e9uxthQzqMmxJNIkAmu50Sql0h7apNfnbE6M7nXNfxcWQIH y31nbtl2+uotA== Message-ID: <4950e61a-189f-4749-baf7-454ca2cce250@kernel.org> Date: Thu, 6 Feb 2025 08:53:55 +0100 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH iwl-net] ice: health.c: fix compilation on gcc 7.5 To: David Laight , Simon Horman Cc: Przemek Kitszel , intel-wired-lan@lists.osuosl.org, Tony Nguyen , netdev@vger.kernel.org, Konrad Knitter , Michal Swiatkowski , Qiuxu Zhuo , Linus Torvalds , Kees Cook , Nick Desaulniers References: <20250205104252.30464-2-przemyslaw.kitszel@intel.com> <20250205204546.GM554665@kernel.org> <20250205225619.31af041c@pumpkin> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 05. 02. 25, 23:56, David Laight wrote: > On Wed, 5 Feb 2025 20:45:46 +0000 > Simon Horman wrote: > >> + Jiri >> >> On Wed, Feb 05, 2025 at 11:42:12AM +0100, Przemek Kitszel wrote: >>> GCC 7 is not as good as GCC 8+ in telling what is a compile-time const, >>> and thus could be used for static storage. So we could not use variables >>> for that, no matter how much "const" keyword is sprinkled around. >>> >>> Excerpt from the report: >>> My GCC is: gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0. >>> >>> CC [M] drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.o >>> drivers/net/ethernet/intel/ice/devlink/health.c:35:3: error: initializer element is not constant >>> ice_common_port_solutions, {ice_port_number_label}}, >>> ^~~~~~~~~~~~~~~~~~~~~~~~~ >>> drivers/net/ethernet/intel/ice/devlink/health.c:35:3: note: (near initialization for 'ice_health_status_lookup[0].solution') >>> drivers/net/ethernet/intel/ice/devlink/health.c:35:31: error: initializer element is not constant >>> ice_common_port_solutions, {ice_port_number_label}}, >>> ^~~~~~~~~~~~~~~~~~~~~ >>> drivers/net/ethernet/intel/ice/devlink/health.c:35:31: note: (near initialization for 'ice_health_status_lookup[0].data_label[0]') >>> drivers/net/ethernet/intel/ice/devlink/health.c:37:46: error: initializer element is not constant >>> "Change or replace the module or cable.", {ice_port_number_label}}, >>> ^~~~~~~~~~~~~~~~~~~~~ >>> drivers/net/ethernet/intel/ice/devlink/health.c:37:46: note: (near initialization for 'ice_health_status_lookup[1].data_label[0]') >>> drivers/net/ethernet/intel/ice/devlink/health.c:39:3: error: initializer element is not constant >>> ice_common_port_solutions, {ice_port_number_label}}, >>> ^~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> Fixes: 85d6164ec56d ("ice: add fw and port health reporters") >>> Reported-by: Qiuxu Zhuo >>> Closes: https://lore.kernel.org/netdev/CY8PR11MB7134BF7A46D71E50D25FA7A989F72@CY8PR11MB7134.namprd11.prod.outlook.com >>> Signed-off-by: Przemek Kitszel >>> --- >>> I would really like to bump min gcc to 8.5 (RH 8 family), >>> instead of supporting old Ubuntu. However SLES 15 is also stuck with gcc 7.5 :( >>> >>> CC: Linus Torvalds >>> CC: Kees Cook >>> CC: Nick Desaulniers >> >> Hi Prezemek, >> >> I ran into a similar problem not so long ago and I'm wondering if >> the following, based on a suggestion by Jiri Slaby, resolves your >> problem. > > I'm sure I remember from somewhere that although the variables are > 'static const' they have to be real variables because they can still > be patched. Not sure what you mean -- using macros, they placed the strings into .rodata anyway. Mind the difference between: const char *X; char *const X; const char *const X; They are all different and allow different things (X++, (*X)++, nothing). Possibly, the problem above could be fixed by the third variant too, IMO. But is ineffective (having generated an unused pointer). thanks, -- js suse labs