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[23.128.96.18]) by mx.google.com with ESMTP id jy11si19144834ejc.732.2021.09.20.21.04.50; Mon, 20 Sep 2021 21:05:14 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347185AbhIUCTo (ORCPT + 99 others); Mon, 20 Sep 2021 22:19:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245504AbhIUCKd (ORCPT ); Mon, 20 Sep 2021 22:10:33 -0400 Received: from wp441.webpack.hosteurope.de (wp441.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:85d2::]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 45810C14D205; Mon, 20 Sep 2021 11:26:11 -0700 (PDT) Received: from [2a03:7846:b79f:101:21c:c4ff:fe1f:fd93] (helo=valdese.nms.ulrich-teichert.org); authenticated by wp441.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1mSNzM-00027j-Q1; Mon, 20 Sep 2021 20:26:00 +0200 Received: from valdese.nms.ulrich-teichert.org (localhost [127.0.0.1]) by valdese.nms.ulrich-teichert.org (8.15.2/8.15.2/Debian-8+deb9u1) with ESMTPS id 18KIPwvw026068 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Sep 2021 20:25:58 +0200 Received: (from ut@localhost) by valdese.nms.ulrich-teichert.org (8.15.2/8.15.2/Submit) id 18KIPsV4026066; Mon, 20 Sep 2021 20:25:54 +0200 Message-Id: <202109201825.18KIPsV4026066@valdese.nms.ulrich-teichert.org> Subject: Re: [PATCH v2 0/4] Introduce and use absolute_pointer macro To: torvalds@linux-foundation.org (Linus Torvalds) Date: Mon, 20 Sep 2021 20:25:54 +0200 (CEST) Cc: krypton@ulrich-teichert.org (Ulrich Teichert), mcree@orcon.net.nz (Michael Cree), linux@roeck-us.net (Guenter Roeck), rth@twiddle.net (Richard Henderson), ink@jurassic.park.msu.ru (Ivan Kokshaysky), mattst88@gmail.com (Matt Turner), James.Bottomley@hansenpartnership.com (James E . J . Bottomley), deller@gmx.de (Helge Deller), davem@davemloft.net (David S . Miller), kuba@kernel.org (Jakub Kicinski), linux-alpha@vger.kernel.org (alpha), geert@linux-m68k.org (Geert Uytterhoeven), linux-kernel@vger.kernel.org (Linux Kernel Mailing List), linux-parisc@vger.kernel.org, netdev@vger.kernel.org (Netdev), linux-sparse@vger.kernel.org (Sparse Mailing-list) In-Reply-To: From: Ulrich Teichert X-Mailer: ELM [version 2.5 PL8] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;ut@ulrich-teichert.org;1632162371;b2cd99ed; X-HE-SMSGID: 1mSNzM-00027j-Q1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, [sorry for the late answer, I was sick yesterday with digestive system trouble, but nothing serious, just painful....] > On Sat, Sep 18, 2021 at 1:26 PM Ulrich Teichert > wrote: > > > > I was just tinkering with it to get it compiled without warning, > > I certainly didn't get the big picture :-/ > > Ok, you shamed me into some tinkering too, and I fixed a couple of > issues with the alpha build. > > The whole "pci_iounmap()" mess is not something I solved (you were > cc'd on the email I sent out about that), but I did test a few > different Jensen configurations and fixed a couple of uglies. > > So at least _some_ Jensen configurations build cleanly once more, and > I re-enabled JENSEN as a valid machine target. Yes, I was able to build a minimal Jensen config without any warning after pulling today, thanks! I think investing a bit in cleaning up non-PCI configurations may help as soon as PCIe will be obsoleted by the next bus system ;-) > But if it doesn't boot, it's all fairly moot. And those things are a > pain to debug, and if the last booting kernel was years and years ago, > I don't think it realistically will necessarily ever be fixed. The main trouble is that my system has only 64MB of memory and the smallest kernel image with all drivers I need was about 105MB big. According to: http://users.bart.nl/~geerten/FAQ-9.html the Jensen can take up to 128MB of RAM and the required PS/2 SIMMs with partity are still available on ebay, so I just bought 4x32 MB SIMMs. After setting CONFIG_CC_OPTIMIZE_FOR_SIZE the kernel image was still 93MB big, but with 128MB I should be able to boot it. Let's see.... > Oh well. I have an odd love-hate relationship with alpha. > > I think it's one of the worst architectures ever designed (memory > ordering is completely broken, and the lack of byte operations in the > original specs were a big reason for the initial problems and eventual > failure). I didn't had the money for an Alpha at that time, but as soon as cheap systems were available on ebay, I took the opportunity. At the time I bought them, I considered the Miatas (the "Personal Workstations" from DEC) as quite fast - that must have been around 2004/2006. > But at the same time, I really did enjoy it back in the day, and it > _was_ the first port I did, and the first truly integrated kernel > architecture (the original Linux m68k port that preceded it was a > "hack up and replace" job rather than "integrate") My experience is that each port is good for code quality, but I can only state that for user space applications, not having done much kernel work, CU, Uli -- Dipl. Inf. Ulrich Teichert|e-mail: Ulrich.Teichert@gmx.de | Listening to: Stormweg 24 |Eat Lipstick: Dirty Little Secret, The Baboon Show: 24539 Neumuenster, Germany|Work Work Work, The Bellrays: Bad Reaction