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Date: Fri, 4 May 2018 14:45:07 -0700
From: Ram Pai <linuxram@us.ibm.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Michal =?iso-8859-1?Q?Such=E1nek?= <msuchanek@suse.de>, fweimer@redhat.com,
 Andrew Morton <akpm@linux-foundation.org>, mhocko@kernel.org,
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 Thomas Gleixner <tglx@linutronix.de>, linuxppc-dev@lists.ozlabs.org,
 Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v3] powerpc, pkey: make protection key 0 less special
Reply-To: Ram Pai <linuxram@us.ibm.com>
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On Fri, May 04, 2018 at 02:31:10PM -0700, Dave Hansen wrote:
> On 05/04/2018 02:26 PM, Michal Suchánek wrote:
> > If it is not ok to change permissions of pkey 0 is it ok to free it?
> 
> It's pretty much never OK to free it on x86 or ppc.  But, we're not
> going to put code in to keep userspace from shooting itself in the foot,
> at least on x86.

and on powerpc aswell.


-- 
Ram Pai