On Mon, Oct 07, 2024 at 06:17:14AM +0000, Vladimir Kondratiev wrote: > >Well, this doesn't get any more true by just irgnoring the previous > >discussion and just reposting :( > > Sorry, this wasn't the intention. Perhaps I messed with the message-id, I see my "patch v1" in one mail thread together with the previous discussion, but not in the other thread. > > Anyway, I think making ZONE_DMA32 selection depend on NONPORTABLE answers the concern > that was raised It doesn't at all. For one not having ZONE_DMA32 is going to break a lot of things. Drivers do expect 32-bit addressable memory. And because SOC designers know this there usually is a way to provide it, e.g. by doing window translations between cpu physical and bus physical address. Please go back to your data sheet or talk to the designers. And if there really is not way to provide this, the right way is just to stop the runtime allocation that triggered you to do this if ZONE_DMA32 is empty, not to add a non-portable option.
