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| author |   John Hubbard <jhubbard@nvidia.com> | 2020-05-17 18:52:37 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-19 16:46:12 +0200 |
| commit | ddae1423bc2ddf87d1e51746ebfa9034c8e323f1 (patch) | |
| tree | 5424c53a8b0ac514ac3850faf782c00d492345bd /drivers/misc/pci_endpoint_test.c | |
| parent | drivers/mic/scif: convert get_user_pages() --> pin_user_pages() (diff) | |
| download | linux-dev-ddae1423bc2ddf87d1e51746ebfa9034c8e323f1.tar.xz linux-dev-ddae1423bc2ddf87d1e51746ebfa9034c8e323f1.zip | |
genwqe: convert get_user_pages() --> pin_user_pages()
This code was using get_user_pages*(), in a "Case 2" scenario
(DMA/RDMA), using the categorization from [1]. That means that it's
time to convert the get_user_pages*() + put_page() calls to
pin_user_pages*() + 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: Frank Haverkamp <haver@linux.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/r/20200518015237.1568940-1-jhubbard@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/pci_endpoint_test.c')
0 files changed, 0 insertions, 0 deletions