From: Michael Ellerman <mpe@ellerman.id.au>
To: Yury Norov <yury.norov@gmail.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
"open list:LINUX FOR POWERPC PA SEMI PWRFICIENT"
<linuxppc-dev@lists.ozlabs.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
"Jason A. Donenfeld" <Jason@zx2c4.com>
Subject: Re: [PATCH 1/2] powerpc: drop dependency on <asm/machdep.h> in archrandom.h
Date: Tue, 26 Jul 2022 16:57:38 +1000 [thread overview]
Message-ID: <87edy8bbtp.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <Yt7CJj8r3eo05pKd@yury-laptop>
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
next prev parent reply other threads:[~2022-07-26 6:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-23 21:45 [PATCH 0/2] lib/nodemask: inline wrappers around bitmap Yury Norov
2022-07-23 21:45 ` [PATCH 1/2] powerpc: drop dependency on <asm/machdep.h> in archrandom.h Yury Norov
2022-07-25 7:28 ` Andy Shevchenko
2022-07-25 16:17 ` Yury Norov
2022-07-25 21:39 ` Andy Shevchenko
2022-07-25 23:32 ` Yury Norov
2022-07-26 6:13 ` Andy Shevchenko
2022-07-26 6:15 ` Andy Shevchenko
2022-07-26 6:57 ` Michael Ellerman [this message]
2022-07-26 15:19 ` Yury Norov
2022-07-25 8:34 ` Michael Ellerman
2022-07-25 12:22 ` Michael Ellerman
2022-07-25 16:28 ` Yury Norov
2022-07-26 2:46 ` Michael Ellerman
2022-07-25 12:22 ` Michael Ellerman
2022-07-23 21:45 ` [RESEND PATCH 2/2] lib/nodemask: inline next_node_in() and node_random() Yury Norov
2022-08-12 5:16 ` Aneesh Kumar K.V
2022-08-12 5:40 ` Yury Norov
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