linux-kernel - Re: [PATCH 1/2] powerpc: drop dependency on <asm/machdep.h> in archrandom.h

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Date:   Mon, 25 Jul 2022 16:32:59 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        "open list:LINUX FOR POWERPC PA SEMI PWRFICIENT" 
        <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 1/2] powerpc: drop dependency on <asm/machdep.h> in
 archrandom.h

On Mon, Jul 25, 2022 at 11:39:39PM +0200, Andy Shevchenko wrote:
> On Mon, Jul 25, 2022 at 6:19 PM Yury Norov <yury.norov@...il.com> wrote:
> > On Mon, Jul 25, 2022 at 09:28:12AM +0200, Andy Shevchenko wrote:
> > > On Sun, Jul 24, 2022 at 12:19 AM Yury Norov <yury.norov@...il.com> wrote:
> 
> ...
> 
> > > >  EXPORT_SYMBOL_GPL(pm_power_off);
> > >
> > > ^^^ (Note this and read below)
> > >
> > > ...
> > >
> > > > +EXPORT_SYMBOL(arch_get_random_seed_long);
> > >
> > > It can't be like this. Brief browsing of the callees shows that.
> >
> > Is my understanding correct that you're suggesting to make it GPL?
> >
> > ppc_md is exported with EXPORT_SYMBOL(), and the function is in header,
> > so it's available for non-GPL code now. I don't want to change it.
> 
> The symbols your function calls are GPL. As far as I understand (not a
> lawyer!) it logically one may not call GPL and pretend to be non-GPL.

Can you explain what you mean in details?

The function is:
        static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
        {
               if (ppc_md.get_random_seed)
                       return ppc_md.get_random_seed(v);

               return false;
        }

ppc_md is non-GPL:
 77 /* The main machine-dep calls structure
 78  */
 79 struct machdep_calls ppc_md;
 80 EXPORT_SYMBOL(ppc_md);

And get_random_seed is initialized in in arch/powerpc/platforms/powernv/rng.c
with different functions that are static and not exported at all. 

I don't understand where arch_get_random_seed_long calls GPL...