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Date:   Thu, 21 Dec 2017 09:49:13 +1100
From:   Benjamin Herrenschmidt <>
To:     Ram Pai <>
Cc:     Dave Hansen <>,,,,,,,,,,,,,,,,,,,,
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.


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