cachepolicy on arm UP/SMP

[rocky]

Hi, all

I am a little confused about arm cachepolicy for UP/SMP.

in arch/arm/mm/mmu.c
for UP , default cache policy is CPOLICY_WRITEBACK;
while for SMP, cache policy is overrided with  WRITEALLOC.

why does SMP cannot use WRITEBACK?
It is about coherency issue?

Please give me some tips.
thanks

rocky







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