From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Rutland <mark.rutland@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@techsingularity.net>,
Russell King <rmk+kernel@armlinux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org, torvalds@linux-foundation.org
Subject: Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS
Date: Tue, 8 Nov 2016 13:05:42 +0100 [thread overview]
Message-ID: <20161108120542.GG3528@osiris> (raw)
In-Reply-To: <1596342.1rV5HksyDO@wuerfel>
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.
WARNING: multiple messages have this Message-ID (diff)
From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Rutland <mark.rutland@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@techsingularity.net>,
Russell King <rmk+kernel@armlinux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org, torvalds@linux-foundation.org
Subject: Re: [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS
Date: Tue, 8 Nov 2016 13:05:42 +0100 [thread overview]
Message-ID: <20161108120542.GG3528@osiris> (raw)
In-Reply-To: <1596342.1rV5HksyDO@wuerfel>
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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next prev parent reply other threads:[~2016-11-08 12:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-01 0:08 [PATCH] mm: only enable sys_pkey* when ARCH_HAS_PKEYS Mark Rutland
2016-11-01 0:08 ` Mark Rutland
2016-11-02 19:15 ` Dave Hansen
2016-11-02 19:15 ` Dave Hansen
2016-11-04 23:44 ` Mark Rutland
2016-11-04 23:44 ` Mark Rutland
2016-11-08 9:30 ` Heiko Carstens
2016-11-08 9:30 ` Heiko Carstens
2016-11-08 10:41 ` Russell King - ARM Linux
2016-11-08 10:41 ` Russell King - ARM Linux
2016-11-08 10:41 ` Russell King - ARM Linux
2016-11-08 10:41 ` Russell King - ARM Linux
[not found] ` <20161108104112.GM1041-l+eeeJia6m9URfEZ8mYm6t73F7V6hmMc@public.gmane.org>
2016-11-08 11:24 ` Heiko Carstens
2016-11-08 11:24 ` Heiko Carstens
2016-11-08 11:24 ` Heiko Carstens
2016-11-08 18:39 ` Dave Hansen
2016-11-08 18:39 ` Dave Hansen
2016-11-08 18:39 ` Dave Hansen
2016-11-08 11:39 ` Arnd Bergmann
2016-11-08 11:39 ` Arnd Bergmann
2016-11-08 12:05 ` Heiko Carstens [this message]
2016-11-08 12:05 ` Heiko Carstens
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