[PATCH RFC 19/35] io_uring/zcrx: remove nth_page() usage within folio
David Hildenbrand <[email protected]>
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Within a folio/compound page, nth_page() is no longer required. Given that we call folio_test_partial_kmap()+kmap_local_page(), the code would already be problematic if the src_pages would span multiple folios. So let's just assume that all src pages belong to a single folio/compound page and can be iterated ordinarily. Cc: Jens Axboe <[email protected]> Signed-off-by: David Hildenbrand <[email protected]> --- io_uring/zcrx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index f29b2a4867516..107b2a1b31c1c 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -966,7 +966,7 @@ static ssize_t io_copy_page(struct page *dst_page, struct page *src_page, size_t n = len; if (folio_test_partial_kmap(page_folio(src_page))) { - src_page = nth_page(src_page, src_offset / PAGE_SIZE); + src_page += src_offset / PAGE_SIZE; src_offset = offset_in_page(src_offset); n = min(PAGE_SIZE - src_offset, PAGE_SIZE - dst_offset); n = min(n, len); -- 2.50.1