The DEFINE_XARRAY*() macros are used to declare a static xarray.

As the structure embeds a mutex(9), we also need to declare the static mutex after the struct xarray. Thus the slightly awkward definition of DEFINE_XARRAY_FLAGS().

The DRM generic code started to use DEFINE_XARRAY_ALLOC() in Linux 6.12.

This is part of the update of DRM drivers to Linux 6.12.

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