linux-imx-headers and ioctl mismatches


Carlos Rafael Giani
 

The linux-imx-headers recipe gathers certain headers from the kernel source so that other recipes which do access these headers don't have to mark the entire kernel as a dependency.

However, if a platform doesn't actually use linux-imx as its kernel, or at least uses a kernel release version that differs from that of linux-imx, ioctl mismatches can occur.

Current example: linux-imx is at version 4.19 , while linux-boundary is at 4.14. The DMA_BUF_IOCTL_PHYS ioctl is defined in the uapi/dma-buf.h header in 4.14 as:

  #define DMA_BUF_IOCTL_PHYS      _IOW(DMA_BUF_BASE, 1, struct dma_buf_phys)

but in 4.19 as:

  #define DMA_BUF_IOCTL_PHYS      _IOW(DMA_BUF_BASE, 10, struct dma_buf_phys)

This leads to Boundary Devices platforms that can't handle this ioctl properly because of the definition mismatch.

Just mentioning this here to discuss ideas. Perhaps it would make sense to create a virtual/imx-headers package, or place the git repo URL as a configurable variable?

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