Commit 23ee8a25 authored by Qinxin Xia's avatar Qinxin Xia Committed by Marek Szyprowski
Browse files

dma-mapping: benchmark: Restore padding to ensure uABI remained consistent 



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: 8ddde07a ("dma-mapping: benchmark: extract a common header file for map_benchmark definition")
Cc: stable@vger.kernel.org
Acked-by: default avatarBarry Song <baohua@kernel.org>
Signed-off-by: default avatarQinxin Xia <xiaqinxin@huawei.com>
Reported-by: default avatarBarry Song <baohua@kernel.org>
Closes: https://lore.kernel.org/lkml/CAGsJ_4waiZ2+NBJG+SCnbNk+nQ_ZF13_Q5FHJqZyxyJTcEop2A@mail.gmail.com/


Reviewed-by: default avatarJonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20251028120900.2265511-2-xiaqinxin@huawei.com
parent 3a866087

include/linux/map_benchmark.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */