linux-kernel - Re: [PATCH v2] ocxl: Allow contexts to be attached with a NULL mm

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Date:   Thu, 20 Jun 2019 15:25:38 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Alastair D'Silva <alastair@....ibm.com>, alastair@...ilva.org
Cc:     Andrew Donnellan <ajd@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Suraj Jitindar Singh <sjitindarsingh@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH v2] ocxl: Allow contexts to be attached with a NULL mm

Alastair D'Silva's on June 20, 2019 2:12 pm:
> From: Alastair D'Silva <alastair@...ilva.org>
> 
> If an OpenCAPI context is to be used directly by a kernel driver, there
> may not be a suitable mm to use.
> 
> The patch makes the mm parameter to ocxl_context_attach optional.
> 
> Signed-off-by: Alastair D'Silva <alastair@...ilva.org>

Yeah I don't think you need to manage a kernel context explicitly
because it will always be flushed with tlbie, comment helps. For
the powerpc/mm bit,

Acked-by: Nicholas Piggin <npiggin@...il.com>