linux-kernel - Re: [RFC v4 17/17] procfs: display the protection-key number associated with a vma

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Date:   Wed, 28 Jun 2017 11:50:13 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Ram Pai <linuxram@...ibm.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, x86@...nel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, dave.hansen@...el.com, hbabu@...ibm.com,
        linuxram@...ibm.com, arnd@...db.de, akpm@...ux-foundation.org,
        corbet@....net, mingo@...hat.com
Subject: Re: [RFC v4 17/17] procfs: display the protection-key number associated with a vma

Ram Pai <linuxram@...ibm.com> writes:

> Display the pkey number associated with the vma in smaps of a task.
> The key will be seen as below:
>
> VmFlags: rd wr mr mw me dw ac key=0

Why wouldn't we just emit a "ProtectionKey:" line like x86 does?

See their arch_show_smap().

You should probably also do what x86 does, which is to not display the
key on CPUs that don't support keys.

cheers