> Why is PERCPU not suitable for arm?
Can't put an output section inside an output section.

>Ditto for i386
__per_cpu_start and __per_cpu_end are defined as relative symbols. But
__per_cpu_start and __per_cpu_end are defined as relative symbols in
PERCPU(). Using PERCPU for i386 won't work for relocated kernel.

>Ditto
Same. __per_cpu_start and __per_cpu_end are relative symbols.

>Ditto
Same. __per_cpu_start and __per_cpu_end are relative symbols. They are
different from PERCPU definition.

Overall, PERCPU() macro make code cleaner. But above definitions can not
fit into the macro.

Thanks.

-Fenghua
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