DAX: warn when kmem regions are truncated for memory block alignment

Device capacity intended for use as system ram should be aligned to the
architecture-defined memory block size or that capacity will be silently
truncated and capacity stranded.

As hotplug dax memory becomes more prevelant, the memory block size
alignment becomes more important for platform and device vendors to pay
attention to - so this truncation should not be silent.

This issue is particularly relevant for CXL Dynamic Capacity devices,
whose capacity may arrive in spec-aligned but block-misaligned chunks.

Link: https://lkml.kernel.org/r/[email protected]
Suggested-by: David Hildenbrand <[email protected]>
Suggested-by: Dan Williams <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Tested-by: Alison Schofield <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Signed-off-by: Gregory Price <[email protected]>
Cc: Dave Jiang <[email protected]>
Cc: Vishal Verma <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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