linux-kernel - Re: [PATCH v2 0/3] s390/cpufeature: rework to allow different types of cpufeatures

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Message-ID: <YtEb+ZeHJ+NbuQKD@linux.ibm.com>
Date:   Fri, 15 Jul 2022 09:49:13 +0200
From:   Hendrik Brueckner <brueckner@...ux.ibm.com>
To:     Steffen Eiden <seiden@...ux.ibm.com>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, nrb@...ux.ibm.com
Subject: Re: [PATCH v2 0/3] s390/cpufeature: rework to allow different types
 of cpufeatures

Maybe, I am bit late ...

On Wed, Jul 13, 2022 at 02:56:41PM +0200, Steffen Eiden wrote:
> Currently the s390 implementaion of cpufeature is limited to elf_hwcap
> bits. Using these to automatically load modules also exposes this
> cpufeature to userspace which, sometimes is not intended.

Those features are (always) exposed to user space as module loading is
actually done by udev rules. However, we had some pseudo-hwcaps (e.g. sie64a)
in the past.. but I very appreciate this change!

Thanks.