linux-kernel - Re: [PATCH 1/2] kernel: add platform

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Message-ID: <YmhRgn896loDHofa@zn.tnic>
Date:   Tue, 26 Apr 2022 22:09:38 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Heiko Carstens <hca@...ux.ibm.com>
Cc:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-arch@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-hyperv@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Arnd Bergmann <arnd@...db.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Oleksandr Tyshchenko <olekstysh@...il.com>
Subject: Re: [PATCH 1/2] kernel: add platform_has() infrastructure

On Tue, Apr 26, 2022 at 09:53:42PM +0200, Heiko Carstens wrote:
> > You probably should make that thing static and use only accessors to
> > modify it in case you wanna change the underlying data structure in the
> > future.
>
> That would add another indirection, which at least I think is not
> necessary and would make it less likely that this infrastructure is
> used.

So if you want to have a single variable which contains platform feature
bits, you don't need any platform_<bla> accessors but use this variable
directly.

I'd prefer the accessors any day of the week, though.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette