From: Ram Pai <linuxram@us.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: mingo@redhat.com, akpm@linux-foundation.org,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
x86@kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org, dave.hansen@intel.com,
benh@kernel.crashing.org, paulus@samba.org,
khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com,
bsingharora@gmail.com, hbabu@us.ibm.com, mhocko@kernel.org,
bauerman@linux.vnet.ibm.com, ebiederm@xmission.com,
corbet@lwn.net, arnd@arndb.de, fweimer@redhat.com,
msuchanek@suse.com, Ulrich.Weigand@de.ibm.com
Subject: Re: [PATCH] x86, powerpc : pkey-mprotect must allow pkey-0
Date: Fri, 9 Mar 2018 12:06:31 -0800 [thread overview]
Message-ID: <20180309200631.GS1060@ram.oc3035372033.ibm.com> (raw)
In-Reply-To: <87lgf1v9di.fsf@concordia.ellerman.id.au>
On Fri, Mar 09, 2018 at 09:19:53PM +1100, Michael Ellerman wrote:
> Ram Pai <linuxram@us.ibm.com> writes:
>=20
> > Once an address range is associated with an allocated pkey, it cannot be
> > reverted back to key-0. There is no valid reason for the above behavior=
=2E On
> > the contrary applications need the ability to do so.
>=20
> Please explain this in much more detail. Is it an ABI change?
Not necessarily an ABI change. older binary applications will continue
to work. It can be considered as a bug-fix.
>=20
> And why did we just notice this?
Yes. this was noticed by an application vendor.
>=20
> > The patch relaxes the restriction.
> >
> > Tested on powerpc and x86_64.
>=20
> Thanks, but please split the patch, one for each arch.
Will do.
RP
next prev parent reply other threads:[~2018-03-09 20:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-09 8:12 [PATCH] x86, powerpc : pkey-mprotect must allow pkey-0 Ram Pai
2018-03-09 8:37 ` Balbir Singh
2018-03-09 19:54 ` Ram Pai
2018-03-09 8:43 ` Ingo Molnar
2018-03-09 20:09 ` Ram Pai
2018-03-09 10:19 ` Michael Ellerman
2018-03-09 20:06 ` Ram Pai [this message]
2018-03-12 15:46 ` Dave Hansen
2018-03-09 11:04 ` Florian Weimer
2018-03-09 20:00 ` Ram Pai
2018-03-14 8:00 ` Florian Weimer
2018-03-14 8:05 ` Florian Weimer
2018-03-14 14:08 ` Dave Hansen
2018-03-09 22:40 ` Dave Hansen
2018-03-10 5:55 ` Ram Pai
2018-03-10 6:50 ` Dave Hansen
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