Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS

From	Heiko Carstens <heiko.carstens@de.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS
Date	2016-11-08 13:10 +0100
Message-ID	<sBdnY-Jq-31@gated-at.bofh.it> (permalink)
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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.

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[PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Mark Rutland <mark.rutland@arm.com> - 2016-11-01 01:10 +0100
  Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Dave Hansen <dave.hansen@linux.intel.com> - 2016-11-02 20:20 +0100
    Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Mark Rutland <mark.rutland@arm.com> - 2016-11-05 00:50 +0100
      Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-11-08 10:40 +0100
        Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-11-08 11:50 +0100
          Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-11-08 12:30 +0100
            Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Dave Hansen <dave.hansen@linux.intel.com> - 2016-11-08 19:40 +0100
        Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Arnd Bergmann <arnd@arndb.de> - 2016-11-08 12:50 +0100
          Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-11-08 13:10 +0100

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