linux-kernel - Re: [PATCH 2/5] mm/memremap_pages: Introduce memremap_compat

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Message-Id: <aecd7276-fb03-5269-6ca1-9a1fb2e23b95@linux.ibm.com>
Date:   Thu, 6 Feb 2020 11:51:42 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Jeff Moyer <jmoyer@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Christoph Hellwig <hch@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 2/5] mm/memremap_pages: Introduce memremap_compat_align()

On 2/6/20 11:21 AM, Dan Williams wrote:
....

>>>
>>> Link: http://lore.kernel.org/r/CAPcyv4gBGNP95APYaBcsocEa50tQj9b5h__83vgngjq3ouGX_Q@mail.gmail.com
>>> Reported-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
>>> Reported-by: Jeff Moyer <jmoyer@...hat.com>
>>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>>> Cc: Paul Mackerras <paulus@...ba.org>
>>> Cc: Michael Ellerman <mpe@...erman.id.au>
>>> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
>>> ---
>>>   arch/powerpc/include/asm/io.h |   10 ++++++++++
>>>   drivers/nvdimm/pfn_devs.c     |    2 +-
>>>   include/linux/io.h            |   23 +++++++++++++++++++++++
>>>   include/linux/mmzone.h        |    1 +
>>>   4 files changed, 35 insertions(+), 1 deletion(-)
>>
>> The powerpc change here looks fine to me.
>>
>> Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)
> 
> Thanks Michael, unfortunately the kbuild robot just woke up and said
> that mips does not like including mmzone.h from io.h. The
> entanglements look intractable.
> 
> Is there a file I can stash a strong definition of
> memremap_compat_align(), maybe arch/powerpc/mm/mem.c? Then I can put a
> generic __weak definition in mm/memremap.c rather than play header
> file include games.
> 


arch/powerpc/mm/ioremap.c ?

-aneesh