linux-kernel - Re: [PATCH v12 13/22] selftests/vm: powerpc implementation for generic abstraction

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Date:   Fri, 16 Mar 2018 15:23:28 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Ram Pai <linuxram@...ibm.com>, shuahkh@....samsung.com,
        linux-kselftest@...r.kernel.org
Cc:     mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, akpm@...ux-foundation.org,
        benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, hbabu@...ibm.com, mhocko@...nel.org,
        bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com, arnd@...db.de
Subject: Re: [PATCH v12 13/22] selftests/vm: powerpc implementation for
 generic abstraction

On 02/21/2018 05:55 PM, Ram Pai wrote:
>  static inline u32 pkey_to_shift(int pkey)
>  {
> +#if defined(__i386__) || defined(__x86_64__) /* arch */
>  	return pkey * PKEY_BITS_PER_PKEY;
> +#elif __powerpc64__ /* arch */
> +	return (NR_PKEYS - pkey - 1) * PKEY_BITS_PER_PKEY;
> +#endif /* arch */
>  }

I really detest the #if #else style.  Can't we just have a pkey_ppc.h
and a pkey_x86.h or something?