On Wed, 10 Jun 2020 14:25:54 +1000 David Gibson <da...@gibson.dropbear.id.au> wrote:
> > > I'm going to definitely have a good look at that. What I think special > > > about s390 is that F_ACCESS_PLATFORM is hurting us because all IO needs > > > to go through ZONE_DMA (this is a problem of the implementation that > > > stemming form a limitation of the DMA API, upstream didn't let me > > > fix it). > > > > My understanding is that power runs into similar issues, but I don't > > know much about power, so I might be entirely wrong :) > > Sort of, but not to the same extent, I think. I'm curious what are the ramifications of a misguided hotplug on POWER? Does using F_ACCESS_PLATFORM when it isn't required have any significant drawbacks, or are you fine to just go with the safe option? Regards, Halil
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