linux-kernel - Re: [PATCH v6 01/17] powerpc/vas: Define macros, register fields and structures

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Date:   Mon, 14 Aug 2017 16:05:22 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        mikey@...ling.org, stewart@...ux.vnet.ibm.com, apopple@....ibm.com,
        hbabu@...ibm.com, oohall@...il.com, linuxppc-dev@...abs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 01/17] powerpc/vas: Define macros, register fields
 and structures

On Mon, 14 Aug 2017 15:21:48 +1000
Michael Ellerman <mpe@...erman.id.au> wrote:

> Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> writes:

> >  arch/powerpc/include/asm/vas.h       |  35 ++++
> >  arch/powerpc/include/uapi/asm/vas.h  |  25 +++  
> 
> I thought we weren't exposing VAS to userspace yet?
> 
> If we are then we need to get things straight WRT copy/paste abort.

No we should not be. This might be just a leftover hunk that should
be moved to a future series.

At the moment (as far as I understand) it should be limited to
preempt-disabled, process context, kernel users which avoids any
concern for switch_to.

Thanks,
Nick