linux-kernel - Re: [PATCH v6 2/2] staging: ion: create one device entry per heap

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Message-ID: <65ef83b2-db3e-eaf6-129f-40e156400624@redhat.com>
Date:   Tue, 5 Dec 2017 15:01:42 -0800
From:   Laura Abbott <labbott@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Riley Andrews <riandrews@...roid.com>,
        Mark Brown <broonie@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        driverdevel <devel@...verdev.osuosl.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        linux-api@...r.kernel.org
Subject: Re: [PATCH v6 2/2] staging: ion: create one device entry per heap

On 12/02/2017 07:53 AM, Greg KH wrote:
>> This is one of the item in the TODO list before been able to unstage ION
>> which is my real need.
> Why does it matter where in the tree this code is?  Don't go adding new
> things to it that are not needed.  Who needs this?  What userspace code
> wants this type of multiple ion devices?
> 

Requirements came in from several places to split /dev/ion -> /dev/ion0
and /dev/ion1 so that security policy (i.e. selinux) could be used to
protect access to certain heaps. I wanted the ABI to be settled before
trying to move out of staging, hence the line in the TODO list about
doing the split.

> thanks,
> 
> greg k-h

Thanks,
Laura