linux-kernel - Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures

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Date:   Mon, 10 May 2021 15:12:09 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linux-Arch <linux-arch@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vineet Gupta <vgupta@...opsys.com>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Michal Simek <monstr@...str.eu>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        alpha <linux-alpha@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>
Subject: Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures

On Mon, May 10, 2021 at 12:16 PM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Sat, May 8, 2021 at 12:09 AM Arnd Bergmann <arnd@...nel.org> wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > There are several architectures that just duplicate the contents
> > of asm-generic/unaligned.h, so change those over to use the
> > file directly, to make future modifications easier.
> >
> > The exceptions are:
> >
> > - arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
> >   unaligned-struct version
> >
> > - ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
> >   the access-ok version
> >
> > - m68k (non-dragonball) also uses the access-ok version without
> >   setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
>
> This not only applies to dragonball, which has the CPU32 core, but also
> to plain 68000, and any SoCs including the 68EC000 core.

I meant out of the machines that are currently supported in the kernel.
As far as I can tell, the only 68000 variants that are supported are
all Dragonball CONFIG_M68328, CONFIG_M68EZ328 and
CONFIG_M68VZ328.

CONFIG_MCPU32 has been dead since a3595962d824 ("m68knommu:
remove obsolete 68360 support")

> Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Thanks!

        Arnd