linux-kernel - Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS

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Date:   Tue, 8 Nov 2016 13:05:42 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mark Rutland <mark.rutland@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS

On Tue, Nov 08, 2016 at 12:39:28PM +0100, Arnd Bergmann wrote:
> On Tuesday, November 8, 2016 10:30:42 AM CET Heiko Carstens wrote:
> > Three architectures (parisc, powerpc, s390) decided to ignore the system
> > calls completely, but still have the pkey code linked into the kernel
> > image.
> 
> Wouldn't it actually make sense to hook this up to the storage keys
> in the s390 page tables?

We have storage keys per _physical_ page. Not per page within the the table
entries. So this doesn't work unfortunately.