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| author | Ilias Apalodimas <ilias.apalodimas@linaro.org> | 2023-02-17 23:21:30 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-02-21 18:15:39 +0100 |
| commit | 4d4266e3fd321fadb628ce02de641b129522c39c (patch) | |
| tree | 3a3b01a058c6b6deb48ef8f14630d1eae7bef589 /arch/arm64 | |
| parent | net: ethtool: fix __ethtool_dev_mm_supported() implementation (diff) | |
| download | linux-4d4266e3fd321fadb628ce02de641b129522c39c.tar.xz linux-4d4266e3fd321fadb628ce02de641b129522c39c.zip | |
page_pool: add a comment explaining the fragment counter usage
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>
Diffstat (limited to 'arch/arm64')
0 files changed, 0 insertions, 0 deletions