net: mvpp2: add comments about smp_processor_id() usage
A previous commit modified a number of smp_processor_id() used in migration-enabled contexts into get_cpu/put_cpu sections. However, a few smp_processor_id() calls remain in the driver, and this commit adds comments explaining why they can be kept. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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