On Mon, 21 Feb 2022, Jiaxun Yang wrote:
> So we can share understanding of those barriers with other archs
> and hopefully one day we will be able to switch asm-generic.
You're mixing the ordering of DMA WRT MMIO here with the ordering of MMIO
WRT itself, and this single line of justification does not explain why it
is a change worth making. You're free to define additional DMA barriers
if we're missing some.
Maciej