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

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Date:   Tue, 26 Apr 2022 21:53:42 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Borislav Petkov <bp@...en8.de>
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 07:31:14PM +0200, Borislav Petkov wrote:
> On Tue, Apr 26, 2022 at 03:40:20PM +0200, Juergen Gross wrote:
> > diff --git a/kernel/platform-feature.c b/kernel/platform-feature.c
> > new file mode 100644
> > index 000000000000..2d52f8442cd5
> > --- /dev/null
> > +++ b/kernel/platform-feature.c
> > @@ -0,0 +1,7 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +#include <linux/cache.h>
> > +#include <linux/platform-feature.h>
> > +
> > +unsigned long __read_mostly platform_features[PLATFORM_FEAT_ARRAY_SZ];
> 
> Probably __ro_after_init.
> 
> > +EXPORT_SYMBOL_GPL(platform_features);
> 
> 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.