From: Dan Williams <dan.j.williams@intel.com>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: linux-nvdimm <linux-nvdimm@lists.01.org>,
Linux MM <linux-mm@kvack.org>,
Jason Gunthorpe <jgg@mellanox.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] mm/memremap: Fix reuse of pgmap instances with internal references
Date: Mon, 12 Aug 2019 09:44:10 -0700 [thread overview]
Message-ID: <CAPcyv4jZWbBUrig3wnE+VGptMEv3fHeRJbRhmMncQwkjLUbvxg@mail.gmail.com> (raw)
In-Reply-To: <x49blwuidqn.fsf@segfault.boston.devel.redhat.com>
On Mon, Aug 12, 2019 at 8:51 AM Jeff Moyer <jmoyer@redhat.com> wrote:
>
> Dan Williams <dan.j.williams@intel.com> writes:
>
> > Currently, attempts to shutdown and re-enable a device-dax instance
> > trigger:
>
> What does "shutdown and re-enable" translate to? If I disable and
> re-enable a device-dax namespace, I don't see this behavior.
I was not seeing this either until I made sure I was in 'bus" device model mode.
# cat /etc/modprobe.d/daxctl.conf
blacklist dax_pmem_compat
alias nd:t7* dax_pmem
# make TESTS="daxctl-devices.sh" check -j 40 2>out
# dmesg | grep WARN.*devm
[ 225.588651] WARNING: CPU: 10 PID: 9103 at mm/memremap.c:211
devm_memremap_pages+0x234/0x850
[ 225.679828] WARNING: CPU: 10 PID: 9103 at mm/memremap.c:211
devm_memremap_pages+0x234/0x850
next prev parent reply other threads:[~2019-08-12 16:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-08 21:43 Dan Williams
2019-08-09 14:42 ` Christoph Hellwig
2019-08-12 15:51 ` Jeff Moyer
2019-08-12 16:44 ` Dan Williams [this message]
2019-08-12 21:29 ` Jeff Moyer
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