dma_pool broken on MIPS generic?

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Hello,

I'm working on a (not yet upstreamed) dmaengine driver. While rebasing
from v4.19 to v4.20-rc1, I saw that it is not working properly anymore
because dma_pool is allocating descriptors in kseg0 which is cached
while in v4.19, it was allocating them in kseg1.

Am I missing something to explicitely state that the cache is not dma
coherent? How could I track this behaviour change?


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com


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