From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from elvis.franken.de (elvis.franken.de [193.175.24.41]) by smtp.subspace.kernel.org (Postfix) with ESMTP id ADCA51B3F3C; Thu, 20 Jun 2024 17:41:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.175.24.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718905323; cv=none; b=ZZiZWHkQGkEJk6n78cenkZj3RhBLreMsTkkn4KAW6TduNY1lphcKMT7d91MNNjH9nprTmKKVfz4o5SSCAVMBWEEfEsE/gYnD7+K2n++FjMzIi5wve2YtQjmU8SWnc088vSaBGOFvgOmCRytiaTMTxkewbR2j2eVhoj7SRPwoyZg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718905323; c=relaxed/simple; bh=+nR5QNLtGvEfCYocFDjiHDm8ngwhk+jo6AdzPgyzDdU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=SQfez70Yig4O0WHxZWAX5qo2cyOC7MFcnFV0KdtJJwN9EImJckHBVVN6qEWdnIWa2aPcntJVb0sm/aM9nOuBm8ORWJWgriqQHTpDsJj3T5QgvCfChTcb4p1ze0PoA6wFn415F83Sfvb2OyrL8ul1zPZsDAYylrcvAvx7g9AIEwg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=alpha.franken.de; spf=pass smtp.mailfrom=alpha.franken.de; arc=none smtp.client-ip=193.175.24.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=alpha.franken.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alpha.franken.de Received: from uucp by elvis.franken.de with local-rmail (Exim 3.36 #1) id 1sKLn5-0002k1-00; Thu, 20 Jun 2024 19:41:43 +0200 Received: by alpha.franken.de (Postfix, from userid 1000) id 22837C0120; Thu, 20 Jun 2024 19:41:24 +0200 (CEST) Date: Thu, 20 Jun 2024 19:41:24 +0200 From: Thomas Bogendoerfer To: Jiaxun Yang Cc: Jonas Gorski , "Maciej W. Rozycki" , "linux-mips@vger.kernel.org" , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/4] MIPS: Introduce config options for LLSC availability Message-ID: References: <20240612-mips-llsc-v2-0-a42bd5562bdb@flygoat.com> <20240612-mips-llsc-v2-2-a42bd5562bdb@flygoat.com> <743a2297-ff4a-4cb3-ae61-8cd4956aa565@app.fastmail.com> Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <743a2297-ff4a-4cb3-ae61-8cd4956aa565@app.fastmail.com> On Thu, Jun 20, 2024 at 05:30:48PM +0100, Jiaxun Yang wrote: > > > 在2024年6月20日六月 下午5:06，Thomas Bogendoerfer写道： > [...] > > do you have an user manual stating that the R5k bug is fixed on this CPUs ? > > I actually investigated R5500 a little bit. > > There is no explicit document mentioned this bug is fixed on R5500, but it's not > mentioned on "VR Series 64-/32-Bit Microprocessor Programming Guide" [1] either, > while some other hardware limitations are mentioned in that guide. > > Plus EMMA platform, which was removed form the kernel, doesn't have > cpu-feature-overrides.h. This means that the platform was running with LLSC > enabled. > > So I think this CPU is not affected. found a preliminary datasheet and it supports your thinking;-) Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]