linux-kernel - Re: [PATCH v9 29/51] mm/mprotect, powerpc/mm/pkeys, x86/mm/pkeys: Add sysfs interface

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Message-ID: <1513810153.2743.25.camel@kernel.crashing.org>
Date:   Thu, 21 Dec 2017 09:49:13 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Ram Pai <linuxram@...ibm.com>
Cc:     Dave Hansen <dave.hansen@...el.com>, mpe@...erman.id.au,
        mingo@...hat.com, akpm@...ux-foundation.org, corbet@....net,
        arnd@...db.de, linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        x86@...nel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, hbabu@...ibm.com, mhocko@...nel.org,
        bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com
Subject: Re: [PATCH v9 29/51] mm/mprotect, powerpc/mm/pkeys, x86/mm/pkeys:
 Add sysfs interface

On Wed, 2017-12-20 at 09:50 -0800, Ram Pai wrote:
> The argument against this patch is --  it should not be baked into
> the ABI as yet, since we do not have clarity on what applications need.
> 
> As it stands today the only way to figure out the information from
> userspace is by probing the kernel through calls to sys_pkey_alloc().
> 
> AT_HWCAP can be used, but that will certainly not be capable of
> providing all the information that userspace might expect.
> 
> Your thoughts?

Well, there's one well known application wanting that whole keys
business, so why not ask them what works for them ?

In the meantime, that shouldn't block the rest of the patches.

Cheers,
Ben.