From: Ram Pai <linuxram@us.ibm.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
mingo@redhat.com, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
x86@kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
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 v3] x86: treat pkey-0 special
Date: Thu, 15 Mar 2018 10:39:59 -0700 [thread overview]
Message-ID: <20180315173959.GE1060@ram.oc3035372033.ibm.com> (raw)
In-Reply-To: <2bf8e659-5a8d-a2d5-ea52-e4d395ea2201@intel.com>
On Thu, Mar 15, 2018 at 10:31:51AM -0700, Dave Hansen wrote:
> On 03/15/2018 10:21 AM, Ram Pai wrote:
> > On Thu, Mar 15, 2018 at 08:55:31AM -0700, Dave Hansen wrote:
> >> On 03/15/2018 02:46 AM, Thomas Gleixner wrote:
> >>>> + if (!pkey || !mm_pkey_is_allocated(mm, pkey))
> >>> Why this extra check? mm_pkey_is_allocated(mm, 0) should not return true
> >>> ever. If it does, then this wants to be fixed.
> >> I was thinking that we _do_ actually want it to seem allocated. It just
> >> get "allocated" implicitly when an mm is created. I think that will
> >> simplify the code if we avoid treating it specially in as many places as
> >> possible.
> > I think, the logic that makes pkey-0 special must to go
> > in arch-neutral code. How about checking for pkey-0 in sys_pkey_free()
> > itself?
>
> This is for protection against shooting yourself in the foot? Yes, that
> can go in sys_pkey_free().
>
> Does this need manpage and/or selftests updates?
Yes. it needs selftest, manpage and documentation updates too.
Unfortunately I am not getting enough reviewed-by for my selftests
and documentation changes. :-( Need help!
--
Ram Pai
prev parent reply other threads:[~2018-03-15 17:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-14 21:00 Ram Pai
2018-03-15 9:46 ` Thomas Gleixner
2018-03-15 15:55 ` Dave Hansen
2018-03-15 16:13 ` Thomas Gleixner
2018-03-15 17:21 ` Ram Pai
2018-03-15 17:31 ` Dave Hansen
2018-03-15 17:39 ` Ram Pai [this message]
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