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| author | Jason Gunthorpe <jgg@mellanox.com> | 2019-01-04 11:40:21 -0700 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-02-11 15:02:33 -0700 |
| commit | d901b2760dc6cd5fbbf2eac31d71d94baa6c4aef (patch) | |
| tree | 6598a5b011cea1bcdf160c2be9fd4e677d387e2b /.clang-format | |
| parent | f368ff188ae4b3ef6f740a15999ea0373261b619 (diff) | |
| download | lwn-d901b2760dc6cd5fbbf2eac31d71d94baa6c4aef.tar.gz lwn-d901b2760dc6cd5fbbf2eac31d71d94baa6c4aef.zip | |
lib/scatterlist: Provide a DMA page iterator
Commit 2db76d7c3c6d ("lib/scatterlist: sg_page_iter: support sg lists w/o
backing pages") introduced the sg_page_iter_dma_address() function without
providing a way to use it in the general case. If the sg_dma_len() is not
equal to the sg length callers cannot safely use the
for_each_sg_page/sg_page_iter_dma_address combination.
Resolve this API mistake by providing a DMA specific iterator,
for_each_sg_dma_page(), that uses the right length so
sg_page_iter_dma_address() works as expected with all sglists.
A new iterator type is introduced to provide compile-time safety against
wrongly mixing accessors and iterators.
Acked-by: Christoph Hellwig <hch@lst.de> (for scatterlist)
Acked-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> (ipu3-cio2)
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to '.clang-format')
| -rw-r--r-- | .clang-format | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/.clang-format b/.clang-format index bc2ffb2a0b53..335ce29ab813 100644 --- a/.clang-format +++ b/.clang-format @@ -240,6 +240,7 @@ ForEachMacros: - 'for_each_set_bit' - 'for_each_set_bit_from' - 'for_each_sg' + - 'for_each_sg_dma_page' - 'for_each_sg_page' - 'for_each_sibling_event' - '__for_each_thread' |