ioremap and page table

[ckim at etri.re.kr]

Hello all,

I'm almost sure but want to check if my understanding is correct.

To use a memory mapped IO, we use functions like request_mem_region and
ioremap, iounmap functions. 

I guess when we call ioremap function, the kernel sets up page table for the
region so that the region becomes non-cacheable, and I don't also have  to
worry about reordering problem. 

Is my understanding correct?

Thanks!

Chan Kim

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