linux-kernel - Re: [PATCH v2 2/2] vhost: disable for OABI

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Message-ID: <CAK8P3a1=-rhiMyAh6=6EwhxSmNnYaXR9NWhh+ZGh4Hh=U_gEuA@mail.gmail.com>
Date:   Mon, 6 Apr 2020 15:15:20 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        "richard.henderson@...aro.org" <richard.henderson@...aro.org>,
        "christophe.lyon@...com" <christophe.lyon@...com>,
        kbuild test robot <lkp@...el.com>,
        "daniel.santos@...ox.com" <daniel.santos@...ox.com>,
        Jason Wang <jasowang@...hat.com>,
        "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Richard Earnshaw <Richard.Earnshaw@....com>,
        Sudeep Dutt <sudeep.dutt@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        kvm list <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] vhost: disable for OABI

On Mon, Apr 6, 2020 at 3:02 PM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> On Mon, Apr 06, 2020 at 02:50:32PM +0200, Arnd Bergmann wrote:
> > On Mon, Apr 6, 2020 at 2:12 PM Michael S. Tsirkin <mst@...hat.com> wrote:
> >
> > >
> > > +config VHOST_DPN
> > > +       bool "VHOST dependencies"
> > > +       depends on !ARM || AEABI
> > > +       default y
> > > +       help
> > > +         Anything selecting VHOST or VHOST_RING must depend on VHOST_DPN.
> > > +         This excludes the deprecated ARM ABI since that forces a 4 byte
> > > +         alignment on all structs - incompatible with virtio spec requirements.
> > > +
> >
> > This should not be a user-visible option, so just make this 'def_bool
> > !ARM || AEABI'
> >
>
> I like keeping some kind of hint around for when one tries to understand
> why is a specific symbol visible.

I meant you should remove the "VHOST dependencies" prompt, not the
help text, which is certainly useful here. You can also use the three lines

     bool
     depends on !ARM || AEABI
     default y

in front of the help text, but those are equivalent to the one-line version
I suggested.

     Arnd