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SubjectRe: [PATCH] oradax: convert get_user_pages() --> pin_user_pages()
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From: John Hubbard <jhubbard@nvidia.com>
Date: Sat, 16 May 2020 19:08:29 -0700

> This code was using get_user_pages_fast(), in a "Case 2" scenario
> (DMA/RDMA), using the categorization from [1]. That means that it's
> time to convert the get_user_pages_fast() + put_page() calls to
> pin_user_pages_fast() + unpin_user_pages() calls.
>
> There is some helpful background in [2]: basically, this is a small
> part of fixing a long-standing disconnect between pinning pages, and
> file systems' use of those pages.
>
> [1] Documentation/core-api/pin_user_pages.rst
>
> [2] "Explicit pinning of user-space pages":
> https://lwn.net/Articles/807108/
>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: sparclinux@vger.kernel.org
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>

Applied to sparc-next, thanks.

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