As others pointed out, DMA_ATTR_NO_KERNEL_MAPPING just means the caller can't rely on a kernel mapping. So the "fix" here is wrong. That being said for cases where we can easily remove a page from the kernel mapping it would be nice to do to:
a) improve security b) as a debug check to see that no one actually tries to access it > + /* remove kernel mapping for pages */ > + set_memory_valid((unsigned long)phys_to_virt(dma_to_phys(dev, > *dma_handle)), Please avoid overly long lines. Also this function only exists for arm64 also and others pointed out won't work for all cases. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
