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Date:   Thu, 20 Jun 2019 15:25:38 +1000
From:   Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [PATCH v2] ocxl: Allow contexts to be attached with a NULL mm
To:     Alastair D'Silva <alastair@au1.ibm.com>, alastair@d-silva.org
Cc:     Andrew Donnellan <ajd@linux.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Frederic Barrat <fbarrat@linux.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        Michael Ellerman <mpe@ellerman.id.au>,
        Paul Mackerras <paulus@samba.org>,
        Suraj Jitindar Singh <sjitindarsingh@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Masahiro Yamada <yamada.masahiro@socionext.com>
References: <20190620041203.12274-1-alastair@au1.ibm.com>
In-Reply-To: <20190620041203.12274-1-alastair@au1.ibm.com>
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Alastair D'Silva's on June 20, 2019 2:12 pm:
> From: Alastair D'Silva <alastair@d-silva.org>
>=20
> If an OpenCAPI context is to be used directly by a kernel driver, there
> may not be a suitable mm to use.
>=20
> The patch makes the mm parameter to ocxl_context_attach optional.
>=20
> Signed-off-by: Alastair D'Silva <alastair@d-silva.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@gmail.com>

=