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This reverts commit fc156629b2.
This commit manages to do three API violations at once:
- dereference the return value of dma_alloc_attrs with the
DMA_ATTR_NO_KERNEL_MAPPING mapping, which is clearly forbidden and
will do the wrong thing on various dma mapping implementations. The
fact that dma-direct uses a struct page as a cookie is an undocumented
implementation detail
- include dma-map-ops.h and use pgprot_dmacoherent despite a clear
comment documenting that this is not acceptable
- use of the VM_DMA_COHERENT for something that is not the dma-mapping
code
- use of VM_FLUSH_RESET_PERMS for vmap, while it is only supported for
vmalloc
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230117085840.32356-6-quic_sibis@quicinc.com
a899d542b6