linux-kernel - Re: [PATCH v3 4/4] IB/core: disable memory registration of fileystem-dax vmas

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Message-ID: <20171129183613.GD4011@ziepe.ca>
Date:   Wed, 29 Nov 2017 11:36:13 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     akpm@...ux-foundation.org, linux-nvdimm@...ts.01.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeff Moyer <jmoyer@...hat.com>, stable@...r.kernel.org,
        hch@....de, linux-mm@...ck.org, Doug Ledford <dledford@...hat.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>
Subject: Re: [PATCH v3 4/4] IB/core: disable memory registration of
 fileystem-dax vmas

On Wed, Nov 29, 2017 at 10:05:51AM -0800, Dan Williams wrote:
> Until there is a solution to the dma-to-dax vs truncate problem it is
> not safe to allow RDMA to create long standing memory registrations
> against filesytem-dax vmas.
> 
> Cc: Sean Hefty <sean.hefty@...el.com>
> Cc: Doug Ledford <dledford@...hat.com>
> Cc: Hal Rosenstock <hal.rosenstock@...il.com>
> Cc: Jeff Moyer <jmoyer@...hat.com>
> Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> Cc: <linux-rdma@...r.kernel.org>
> Cc: <stable@...r.kernel.org>
> Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings")
> Reported-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
>  drivers/infiniband/core/umem.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

No problem here with drivers/rdma. This will go through another tree
with the rest of the series? In which case here is a co-maintainer ack
for this patch:

Acked-by: Jason Gunthorpe <jgg@...lanox.com>

Dan, can you please update my address to jgg@...pe.ca, thanks :)

Jason