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[SPARC64]: Give more accurate errors in dr_cpu_configure().
When cpu_up() fails, we can discern the most likely cause. If cpu_present() is false, this means the cpu did not appear in the MD. If -ENODEV is the error return value, then the processor did not boot properly into the kernel. Pass this information back in the dr-cpu response packet. Signed-off-by: David S. Miller <[email protected]>
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