Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588_CLOCK dependencies

[Nicolas Pitre]

On Mon, 2 Aug 2021, Arnd Bergmann wrote:

> On Mon, Aug 2, 2021 at 10:46 PM Keller, Jacob E
> <jacob.e.keller@xxxxxxxxx> wrote:
> 
> > > You can do something like it for a particular symbol though, such as
> > >
> > > config MAY_USE_PTP_1588_CLOCK
> > >        def_tristate PTP_1588_CLOCK || !PTP_1588_CLOCK
> > >
> > >  config E1000E
> > >         tristate "Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support"
> > >         depends on PCI && (!SPARC32 || BROKEN)
> > > +       depends on MAY_USE_PTP_1588_CLOCK
> > >         select CRC32
> > > -       imply PTP_1588_CLOCK
> >
> > What about "integrates"?
> 
> Maybe, we'd need to look at whether that fits for the other users of the
> "A || !A" trick.

I implemented "conditional dependencies" at the time, which is syntactic 
sugar to express the above as:

	depends on A if A != n

	depends on A if A

etc.

http://lkml.iu.edu/hypermail/linux/kernel/2004.2/09783.html

But Masahiro shut it down.


Nicolas