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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Yury Norov <yury.norov@gmail.com>, linux-kernel@vger.kernel.org,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        linuxppc-dev@lists.ozlabs.org,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Yury Norov <yury.norov@gmail.com>
Subject: Re: [PATCH 1/2] powerpc: drop dependency on <asm/machdep.h> in
 archrandom.h
In-Reply-To: <20220723214537.2054208-2-yury.norov@gmail.com>
References: <20220723214537.2054208-1-yury.norov@gmail.com>
 <20220723214537.2054208-2-yury.norov@gmail.com>
Date:   Mon, 25 Jul 2022 18:34:35 +1000
Message-ID: <8735epd204.fsf@mpe.ellerman.id.au>
MIME-Version: 1.0
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Yury Norov <yury.norov@gmail.com> writes:
> 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
>
> Signed-off-by: Yury Norov <yury.norov@gmail.com>
> ---
>  arch/powerpc/include/asm/archrandom.h |  9 +--------
>  arch/powerpc/kernel/setup-common.c    | 11 +++++++++++
>  2 files changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h
> index 9a53e29680f4..21def59ef1a6 100644
> --- a/arch/powerpc/include/asm/archrandom.h
> +++ b/arch/powerpc/include/asm/archrandom.h
> @@ -4,7 +4,7 @@
>  
>  #ifdef CONFIG_ARCH_RANDOM
>  
> -#include <asm/machdep.h>
> +bool __must_check arch_get_random_seed_long(unsigned long *v);
>  
>  static inline bool __must_check arch_get_random_long(unsigned long *v)
>  {
> @@ -16,13 +16,6 @@ static inline bool __must_check arch_get_random_int(unsigned int *v)
>  	return false;
>  }
>  
> -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;
> -}

I'd rather we didn't have to force this out of line.

I think I see a different way to fix it, I'll just do some more build
tests.

cheers