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cpu is taken from pgoff & 0xffff. cpu_online() does not reject cpu >= nr_cpu_ids, and per_cpu_ptr() can then walk off __per_cpu_offset. Signed-off-by: Yi Xie <xieyi@kylinos.cn> Reviewed-by: Naman Jain <namjain@linux.microsoft.com> Signed-off-by: Wei Liu <wei.liu@kernel.org>