Messages in this thread Patch in this message | | | Subject | [PATCH] mm: re-allow pinning of zero pfns (again) | From | Alex Williamson <> | Date | Mon, 08 Aug 2022 22:42:24 -0600 |
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The below referenced commit makes the same error as 1c563432588d ("mm: fix is_pinnable_page against a cma page"), re-interpreting the logic to exclude pinning of the zero page, which breaks device assignment with vfio.
Link: https://lore.kernel.org/all/165490039431.944052.12458624139225785964.stgit@omen Fixes: f25cbb7a95a2 ("mm: add zone device coherent type memory support") Signed-off-by: Alex Williamson <alex.williamson@redhat.com> --- include/linux/mm.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 18e01474cf6b..772279ed7010 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1544,9 +1544,8 @@ static inline bool is_longterm_pinnable_page(struct page *page) if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE) return false; #endif - return !(is_device_coherent_page(page) || - is_zone_movable_page(page) || - is_zero_pfn(page_to_pfn(page))); + return !(is_device_coherent_page(page) || is_zone_movable_page(page)) || + is_zero_pfn(page_to_pfn(page)); } #else static inline bool is_longterm_pinnable_page(struct page *page)
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