swiotlb: ensure a segment doesn't cross the area boundary

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Free slots tracking assumes that slots in a segment can be allocated to
fulfill a request. This implies that slots in a segment should belong to
the same area. Although the possibility of a violation is low, it is better
to explicitly enforce segments won't span multiple areas by adjusting the
number of slabs when configuring areas.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Chao Gao 2022-07-15 18:45:35 +08:00 • committed by Christoph Hellwig

parent 44335487ba

commit 57e6840cf7

1 changed files with 10 additions and 1 deletions

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kernel/dma/swiotlb.c

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