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When reading the page_pool code the first impression is that keeping two separate counters, one being the page refcnt and the other being fragment pp_frag_count, is counter-intuitive. However without that fragment counter we don't know when to reliably destroy or sync the outstanding DMA mappings. So let's add a comment explaining this part. Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Link: https://lore.kernel.org/r/20230217222130.85205-1-ilias.apalodimas@linaro.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
414 lines
12 KiB
414 lines
12 KiB