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| author | Qinxin Xia <xiaqinxin@huawei.com> | 2025-10-28 15:08:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-24 12:30:07 +0300 |
| commit | 4c49fe0896617e36f135047fe34dbc4930b73d88 (patch) | |
| tree | da4071ccdb9ab65ea286609c43e080e56ad9f159 /include | |
| parent | b30421bc31c068b71dc50e3b90e64ed1b4742b46 (diff) | |
| download | linux-4c49fe0896617e36f135047fe34dbc4930b73d88.tar.xz | |
dma-mapping: benchmark: Restore padding to ensure uABI remained consistent
commit 23ee8a2563a0f24cf4964685ced23c32be444ab8 upstream.
The padding field in the structure was previously reserved to
maintain a stable interface for potential new fields, ensuring
compatibility with user-space shared data structures.
However,it was accidentally removed by tiantao in a prior commit,
which may lead to incompatibility between user space and the kernel.
This patch reinstates the padding to restore the original structure
layout and preserve compatibility.
Fixes: 8ddde07a3d28 ("dma-mapping: benchmark: extract a common header file for map_benchmark definition")
Cc: stable@vger.kernel.org
Acked-by: Barry Song <baohua@kernel.org>
Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>
Reported-by: Barry Song <baohua@kernel.org>
Closes: https://lore.kernel.org/lkml/CAGsJ_4waiZ2+NBJG+SCnbNk+nQ_ZF13_Q5FHJqZyxyJTcEop2A@mail.gmail.com/
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20251028120900.2265511-2-xiaqinxin@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/map_benchmark.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/map_benchmark.h b/include/linux/map_benchmark.h index 62674c83bde4..48e2ff95332f 100644 --- a/include/linux/map_benchmark.h +++ b/include/linux/map_benchmark.h @@ -27,5 +27,6 @@ struct map_benchmark { __u32 dma_dir; /* DMA data direction */ __u32 dma_trans_ns; /* time for DMA transmission in ns */ __u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */ + __u8 expansion[76]; /* For future use */ }; #endif /* _KERNEL_DMA_BENCHMARK_H */ |