BUG? linux-mips flush_dcache_page

[Minchan Kim]

Hi, Ralf. 

I suffered form data consistency problem. 

Many code of kernel fs usually allocate high page and flush.
But flush_dcache_page of mips checks PageHighMem to avoid flush
so that data consistency is broken, I think. 

I found it's by you and Atsushi-san on 585fa724. 
Why do we need the check?
Could you elaborte please? 

-- 
Kind regards,
Minchan Kim
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