linux-kernel - Re: [PATCH v3 4/8] powerpc/pseries/svm: Add a powerpc version of cc_platform

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Date:   Thu, 16 Sep 2021 08:35:16 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Borislav Petkov <bp@...en8.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        linux-efi@...r.kernel.org, Brijesh Singh <brijesh.singh@....com>,
        kvm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        platform-driver-x86@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>, linux-s390@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, x86@...nel.org,
        amd-gfx@...ts.freedesktop.org,
        Christoph Hellwig <hch@...radead.org>,
        linux-graphics-maintainer@...are.com,
        Tom Lendacky <thomas.lendacky@....com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-fsdevel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 4/8] powerpc/pseries/svm: Add a powerpc version of
 cc_platform_has()

On Wed, Sep 15, 2021 at 07:18:34PM +0200, Christophe Leroy wrote:
> Could you please provide more explicit explanation why inlining such an
> helper is considered as bad practice and messy ?

Because now we get architectures to all subly differ.  Look at the mess
for ioremap and the ioremap* variant.

The only good reason to allow for inlines if if they are used in a hot
path.  Which cc_platform_has is not, especially not on powerpc.