On Thu, Dec 21, 2023 at 11:10:51PM +0530, Ajay Agarwal wrote: > If CONFIG_ZONE_DMA32 is disabled, then the dmam_alloc_coherent > will fail to allocate the memory if there are no 32-bit addresses > available. This will lead to the PCIe RC probe failure. > Fix this by setting the DMA mask to 32 bits only if the kernel > configuration enables DMA32 zone. Else, leave the mask as is. And that's why you never must disable ZONE_DMA32 on devices that can have more than >32bit memory and don't use an iommu for everything. NAK.
