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SubjectRe: [PATCH 1/2] powerpc: drop dependency on <asm/machdep.h> in archrandom.h
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Yury Norov <yury.norov@gmail.com> writes:
> 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@gmail.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.

That's true, your change maintains the status quo.

But I think we actually don't need it exported to modules, I think it's
a private detail of the RNG <-> architecture interface, not something
that modules should be calling.

So I think it's OK to drop the EXPORT_SYMBOL, either in this patch or a
subsequent one if you don't want to rebase.

cheers

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