diff options
| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2024-06-04 13:48:20 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-07-04 04:30:17 +0200 |
| commit | 2669324b81e5f67d409d3ad988da77c7c2a09045 (patch) | |
| tree | dfcaaac8976102e009b23034eaaeb2f6197a12a8 /Documentation/core-api | |
| parent | fs/proc/task_mmu: use folio API in pte_is_pinned() (diff) | |
| download | linux-2669324b81e5f67d409d3ad988da77c7c2a09045.tar.xz linux-2669324b81e5f67d409d3ad988da77c7c2a09045.zip | |
mm: remove page_maybe_dma_pinned()
After the last user of page_maybe_dma_pinned() is converted to
folio_maybe_dma_pinned(), remove page_maybe_dma_pinned() and update the
document and comment.
[wangkefeng.wang@huawei.com: fix pin_user_pages.rst underlining]
Link: https://lkml.kernel.org/r/61b256c7-4989-44ec-83db-f34a1bd4be2d@huawei.com
Link: https://lkml.kernel.org/r/20240604114822.2089819-3-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Helge Deller <deller@gmx.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/core-api')
| -rw-r--r-- | Documentation/core-api/pin_user_pages.rst | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/Documentation/core-api/pin_user_pages.rst b/Documentation/core-api/pin_user_pages.rst index 6b5f7e6e7155..57b17978e156 100644 --- a/Documentation/core-api/pin_user_pages.rst +++ b/Documentation/core-api/pin_user_pages.rst @@ -196,20 +196,20 @@ INCORRECT (uses FOLL_GET calls): write to the data within the pages put_page() -page_maybe_dma_pinned(): the whole point of pinning -=================================================== +folio_maybe_dma_pinned(): the whole point of pinning +==================================================== -The whole point of marking pages as "DMA-pinned" or "gup-pinned" is to be able -to query, "is this page DMA-pinned?" That allows code such as page_mkclean() +The whole point of marking folios as "DMA-pinned" or "gup-pinned" is to be able +to query, "is this folio DMA-pinned?" That allows code such as page_mkclean() (and file system writeback code in general) to make informed decisions about -what to do when a page cannot be unmapped due to such pins. +what to do when a folio cannot be unmapped due to such pins. What to do in those cases is the subject of a years-long series of discussions and debates (see the References at the end of this document). It's a TODO item here: fill in the details once that's worked out. Meanwhile, it's safe to say that having this available: :: - static inline bool page_maybe_dma_pinned(struct page *page) + static inline bool folio_maybe_dma_pinned(struct folio *folio) ...is a prerequisite to solving the long-running gup+DMA problem. |