dma-debug: Make leak-like behaviour apparent

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Now that we can dynamically allocate DMA debug entries to cope with
drivers maintaining excessively large numbers of live mappings, a driver
which *does* actually have a bug leaking mappings (and is not unloaded)
will no longer trigger the "DMA-API: debugging out of memory - disabling"
message until it gets to actual kernel OOM conditions, which means it
could go unnoticed for a while. To that end, let's inform the user each
time the pool has grown to a multiple of its initial size, which should
make it apparent that they either have a leak or might want to increase
the preallocation size.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Qian Cai <cai@lca.pw>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Robin Murphy 2018-12-10 14:00:30 +00:00 • committed by Christoph Hellwig

parent 2b9d9ac02b

commit ceb51173b2

2 changed files with 18 additions and 1 deletions

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6

Documentation/DMA-API.txt

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13

kernel/dma/debug.c

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