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Date: Sat, 18 Sep 2021 10:04:20 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Ulrich Teichert <krypton@...ich-teichert.org> Cc: Michael Cree <mcree@...on.net.nz>, Guenter Roeck <linux@...ck-us.net>, Richard Henderson <rth@...ddle.net>, Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner <mattst88@...il.com>, "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>, Helge Deller <deller@....de>, "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, alpha <linux-alpha@...r.kernel.org>, Geert Uytterhoeven <geert@...ux-m68k.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-parisc@...r.kernel.org, Netdev <netdev@...r.kernel.org>, Sparse Mailing-list <linux-sparse@...r.kernel.org> Subject: Re: [PATCH v2 0/4] Introduce and use absolute_pointer macro On Sat, Sep 18, 2021 at 6:11 AM Ulrich Teichert <krypton@...ich-teichert.org> wrote: > > Hi, > > > > > On Thu, Sep 16, 2021 at 11:35:36AM -0700, Linus Torvalds wrote: > > > Naah. I think the Jensen actually had an ISA slot. Came with a > > > whopping 8MB too, so the ISA DMA should work just fine. > > > > > > Or maybe it was EISA only? I really don't remember. > > It's EISA only. I've made some pictures of a somewhat dusty inside of > a Jensen with 4 EISA cards (from bottom to top: SCSI, video, 2x network): Ok. Looking around the config options, there _are_ systems with ISA slots, but it's not the old Jensen one. It's apparently some evaluation boards but also the "AlphaPC64" one. So we do want CONFIG_ISA for alpha, even if not Jensen. (I forget which alpha I had. For some reason I want to think I had an EISA machine and probably Jensen. Maybe upgraded to a 164 later?) > I could not get a recent kernel to boot, but it's booting ancient kernels > just fine: > > Linux version 2.4.27-2-generic (tretkowski@...tille) (gcc version 3.3.5 (Debian 1:3.3.5-12)) #1 Sun May 29 18:40:58 UTC 2005 Ouch. Without having some kind of bisection, I guess we'll never know. And I assume it's not really been tested since, so it could be multiple reasons, including compiler updates causing dodgy code to not work etc etc. > While we're at it, during my vain attempts to get new kernels to boot, > I tried to disable PCI support to make the kernels smaller (after all, > the Jensen has only EISA, so what good would PCI support for?) and > got it to compile with the attached patch (which fixes some warnings, > too). Can you send me your Jensen config? I do not see why you should be using that horrible __EXERN_INLINE. It will cause gcc to sometimes not inline at all, and not generate the out-of-line body either. Sometimes that is what you want: you want to generate one single body of the function, and particularly one that is _different_ from the inlining case (ie for inlining you want to do the simple thing, for out-of-line you do something fancier). But that isn't the case here, so this looks like a workaround for something else. But this code does end up using preprocessor concatenation etc, so I might be missing some case. Linus
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