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Message-ID: <CAPcyv4gTOf+EWzSGrFrh2GrTZt5HVR=e+xicUKEpiy57px8J+w@mail.gmail.com>
Date: Wed, 26 Jun 2019 09:00:47 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Christoph Hellwig <hch@....de>
Cc: Jérôme Glisse <jglisse@...hat.com>,
Jason Gunthorpe <jgg@...lanox.com>,
Ben Skeggs <bskeggs@...hat.com>, Linux MM <linux-mm@...ck.org>,
nouveau@...ts.freedesktop.org,
Maling list - DRI developers
<dri-devel@...ts.freedesktop.org>,
linux-nvdimm <linux-nvdimm@...ts.01.org>,
linux-pci@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Michal Hocko <mhocko@...e.com>,
"Weiny, Ira" <ira.weiny@...el.com>
Subject: Re: [PATCH 04/25] mm: remove MEMORY_DEVICE_PUBLIC support
[ add Ira ]
On Wed, Jun 26, 2019 at 5:27 AM Christoph Hellwig <hch@....de> wrote:
>
> The code hasn't been used since it was added to the tree, and doesn't
> appear to actually be usable.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
[..]
> diff --git a/mm/swap.c b/mm/swap.c
> index 7ede3eddc12a..83107410d29f 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -740,17 +740,6 @@ void release_pages(struct page **pages, int nr)
> if (is_huge_zero_page(page))
> continue;
>
> - /* Device public page can not be huge page */
> - if (is_device_public_page(page)) {
> - if (locked_pgdat) {
> - spin_unlock_irqrestore(&locked_pgdat->lru_lock,
> - flags);
> - locked_pgdat = NULL;
> - }
> - put_devmap_managed_page(page);
> - continue;
> - }
> -
This collides with Ira's bug fix [1]. The MEMORY_DEVICE_FSDAX case
needs this to be converted to be independent of "public" pages.
Perhaps it should be pulled out of -mm and incorporated in this
series.
[1]: https://lore.kernel.org/lkml/20190605214922.17684-1-ira.weiny@intel.com/
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