linux-kernel - Re: [PATCH] kbuild: add machine size to CHEKCFLAGS

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Message-ID: <0dd9d6dc-6cb3-157c-33ac-8c3e449a3859@landley.net>
Date:   Wed, 30 May 2018 17:36:45 -0500
From:   Rob Landley <rob@...dley.net>
To:     Andreas Färber <afaerber@...e.de>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        "James E . J . Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Cao jin <caoj.fnst@...fujitsu.com>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-mips@...ux-mips.org,
        linux-parisc@...r.kernel.org, sparclinux@...r.kernel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] kbuild: add machine size to CHEKCFLAGS

On 05/30/2018 05:00 PM, Andreas Färber wrote:
> What about the architectures not touched by your patch that previously
> had no -m32/-m64? (arc, c6x, h8300, hexagon, m68k, microblaze, nds32,
> nios2, openrisc, powerpc, riscv, s390, sh, unicore32, xtensa)
> 
> You forgot to CC them on this patch.

A) He cc'd arch/sh on the previous patch earlier today, to which I replied:

https://marc.info/?l=linux-sh&m=152769132515226&w=2

B) Every change to common infrastructure should cc: every arch? Really? So like
filesystem changes and stuff to?

> Have you really checked that all their toolchains support the -m32/-m64
> flags you newly introduce for them? Apart from non-biarch architectures,
> I'm thinking of 31-bit s390 as a corner case where !64 != 32.

1) Last I heard Linux implements lp64:
   http://www.unix.org/whitepapers/64bit.html

2) it's unlikely to be worse than it was before the patch,

3) last I checked https://github.com/landley/mkroot boots to an s390 shell
prompt under qemu, although I haven't tried building with this patch. (And you
may still need to add HOST_EXTRA='lex yacc bison flex' to the command line
unless they've re-added the _shipped versions like the old kconfig had...) Point
is, shouldn't be too hard to test it. Presumably that's why we have an -rc1 and
then 6 more -rc versions each release...

Rob