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 09:28:12 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Yury Norov <yury.norov@...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 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.

-- 
With Best Regards,
Andy Shevchenko