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 09:17:42 -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 09:28:12AM +0200, Andy Shevchenko wrote:
> On Sun, Jul 24, 2022 at 12:19 AM Yury Norov <yury.norov@...il.com> wrote:
> >
> > archrandom.h includes <asm/machdep.h> to refer ppc_md. This causes
> > circular header dependency, if generic nodemask.h  includes random.h:
> >
> > In file included from include/linux/cred.h:16,
> >                  from include/linux/seq_file.h:13,
> >                  from arch/powerpc/include/asm/machdep.h:6,
> >                  from arch/powerpc/include/asm/archrandom.h:5,
> >                  from include/linux/random.h:109,
> >                  from include/linux/nodemask.h:97,
> >                  from include/linux/list_lru.h:12,
> >                  from include/linux/fs.h:13,
> >                  from include/linux/compat.h:17,
> >                  from arch/powerpc/kernel/asm-offsets.c:12:
> > include/linux/sched.h:1203:9: error: unknown type name 'nodemask_t'
> >  1203 |         nodemask_t                      mems_allowed;
> >       |         ^~~~~~~~~~
> >
> > Fix it by removing <asm/machdep.h> dependency from archrandom.h
> 
> ...
> 
> >  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.