Re: [PATCH 13/21] arc: dma-mapping: skip invalidating before bidirectional DMA

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CC Shahab

On 3/27/23 17:43, Arnd Bergmann wrote:
From: Arnd Bergmann<arnd@xxxxxxxx>

Some architectures that need to invalidate buffers after bidirectional
DMA because of speculative prefetching only do a simpler writeback
before that DMA, while architectures that don't need to do the second
invalidate tend to have a combined writeback+invalidate before the
DMA.

arc is one of the architectures that does both, which seems unnecessary.

Change it to behave like arm/arm64/xtensa instead, and use just a
writeback before the DMA when we do the invalidate afterwards.

Signed-off-by: Arnd Bergmann<arnd@xxxxxxxx>

Reviewed-by: Vineet Gupta <vgupta@xxxxxxxxxx>

Shahab can you give this a spin on hsdk - run glibc testsuite over ssh and make sure nothing strange happens.

Thx,
-Vineet



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