linux-kernel - Re: [PATCH v9 1/2] arch/*: Add CONFIG_ARCH_HAVE

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Message-ID: <7b1813846c2ad915f5432394ccbf7966065b5e45.camel@wdc.com>
Date:   Tue, 15 May 2018 15:14:14 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "axboe@...nel.dk" <axboe@...nel.dk>
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Subject: Re: [PATCH v9 1/2] arch/*: Add CONFIG_ARCH_HAVE_CMPXCHG64

On Tue, 2018-05-15 at 12:54 +1000, Michael Ellerman wrote:
> Bart Van Assche <bart.vanassche@....com> writes:
> > 
> > +    -----------------------
> > +    |         arch |status|
> > +    -----------------------
> > +    |       alpha: |  ok  |
> > +    |         arc: | TODO |
> > +    |         arm: |!thumb|
> > +    |       arm64: |  ok  |
> > +    |         c6x: | TODO |
> > +    |       h8300: | TODO |
> > +    |     hexagon: | TODO |
> > +    |        ia64: |  ok  |
> > +    |        m68k: |  ok  |
> > +    |  microblaze: | TODO |
> > +    |        mips: |64-bit|
> > +    |       nios2: | TODO |
> > +    |    openrisc: | TODO |
> > +    |      parisc: |  ok  |
> > +    |     powerpc: |64-bit|
> 
> I think that is correct for powerpc, we don't have a 32-bit
> implementation and there's no fallback it seems.
> 
> > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> > --- a/arch/powerpc/Kconfig
> > +++ b/arch/powerpc/Kconfig
> > @@ -150,6 +150,7 @@ config PPC
> >  	select ARCH_HAS_UBSAN_SANITIZE_ALL
> >  	select ARCH_HAS_ZONE_DEVICE		if PPC_BOOK3S_64
> >  	select ARCH_HAVE_NMI_SAFE_CMPXCHG
> > +	select ARCH_HAVE_CMPXCHG64
> 
> So shouldn't this should be:
> 
> +	select ARCH_HAVE_CMPXCHG64		if PPC64
> 
> And it should be sorted alphabetically, ie. above the previous NMI entry.

Hello Michael,

Thanks, I will make these changes.

Bart.