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Date: Thu, 11 Apr 2019 10:46:30 -0700 From: Nick Desaulniers <ndesaulniers@...gle.com> To: Arnd Bergmann <arnd@...db.de> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, clang-built-linux@...glegroups.com, Nathan Chancellor <natechancellor@...il.com>, linux-s390 <linux-s390@...r.kernel.org>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Philipp Rudo <prudo@...ux.vnet.ibm.com>, Tony Krowiak <akrowiak@...ux.ibm.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/2] s390: only build for new CPUs with clang On Thu, Apr 11, 2019 at 3:18 AM Arnd Bergmann <arnd@...db.de> wrote: > > On Thu, Apr 11, 2019 at 12:20 AM 'Nick Desaulniers' via Clang Built > Linux <clang-built-linux@...glegroups.com> wrote: > > > > On Wed, Apr 10, 2019 at 1:13 PM Arnd Bergmann <arnd@...db.de> wrote: > > > > > > llvm does does not understand -march=z9-109 and older target > > > > Please file bugs for these in LLVM's issue tracker. It might be > > possible to enable these additional architecture variants if they're > > similar to existing ones and simply unrecognized. IIRC, we had this > > issue with armv7 variants. > > I really don't see that as necessary here. While generally speaking, > it would be nice to support the widest possible range of hardware, > and it would not be hard to add this support, it seems highly unlikely > that anyone would actually want to use that in case of s390. > > The last enterprise distros to support z9 were SLES11 (end of life as > of last month) and RHEL6 (ending its 10 year life next year). Anyone > who is still on those releases will probably not install a brand new > compiler, and anyone who is on newer releases won't run on prehistoric > hardware. Are those machine variants worth dropping kernel support for then? > > Debian still runs on very old hardware in theory, but even there you'd > have a hard time finding someone to test the output of the compiler > on an old machine. > > Arnd -- Thanks, ~Nick Desaulniers
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