search for: page_maybe_dma_pin

Displaying 5 results from an estimated 5 matches for "page_maybe_dma_pin".

[PATCH v2 0/2] vhost, docs: convert to pin_user_pages(), new "case 5"
2020 Jun 01
3
[PATCH v2 0/2] vhost, docs: convert to pin_user_pages(), new "case 5"
This is based on Linux 5.7, plus one prerequisite patch: "mm/gup: update pin_user_pages.rst for "case 3" (mmu notifiers)" [1] Changes since v1: removed references to set_page_dirty*(), in response to Souptick Joarder's review (thanks!). Cover letter for v1, edited/updated slightly: It recently became clear to me that there are some get_user_pages*() callers that
[PATCH 0/2] vhost, docs: convert to pin_user_pages(), new "case 5"
2020 May 29
6
[PATCH 0/2] vhost, docs: convert to pin_user_pages(), new "case 5"
Hi, It recently became clear to me that there are some get_user_pages*() callers that don't fit neatly into any of the four cases that are so far listed in pin_user_pages.rst. vhost.c is one of those. Add a Case 5 to the documentation, and refer to that when converting vhost.c. Thanks to Jan Kara for helping me (again) in understanding the interaction between get_user_pages() and page
[PATCH 1/2] docs: mm/gup: pin_user_pages.rst: add a "case 5"
2020 May 29
0
[PATCH 1/2] docs: mm/gup: pin_user_pages.rst: add a "case 5"
...s like this: + +Correct (uses FOLL_PIN calls): + pin_user_pages() + access the data within the pages + set_page_dirty_lock() + unpin_user_pages() + +INCORRECT (uses FOLL_GET calls): + get_user_pages() + access the data within the pages + set_page_dirty_lock() + put_page() + page_maybe_dma_pinned(): the whole point of pinning =================================================== -- 2.26.2
[PATCH v2 1/2] docs: mm/gup: pin_user_pages.rst: add a "case 5"
2020 Jun 01
0
[PATCH v2 1/2] docs: mm/gup: pin_user_pages.rst: add a "case 5"
...ase 2, it may still require +FOLL_PIN, for patterns like this: + +Correct (uses FOLL_PIN calls): + pin_user_pages() + write to the data within the pages + unpin_user_pages() + +INCORRECT (uses FOLL_GET calls): + get_user_pages() + write to the data within the pages + put_page() + page_maybe_dma_pinned(): the whole point of pinning =================================================== -- 2.26.2
[PATCH 1/2] docs: mm/gup: pin_user_pages.rst: add a "case 5"
2020 May 31
1
[PATCH 1/2] docs: mm/gup: pin_user_pages.rst: add a "case 5"
..._user_pages() > + access the data within the pages > + set_page_dirty_lock() > + unpin_user_pages() > + > +INCORRECT (uses FOLL_GET calls): > + get_user_pages() > + access the data within the pages > + set_page_dirty_lock() > + put_page() > + > page_maybe_dma_pinned(): the whole point of pinning > =================================================== > > -- > 2.26.2 >