[mm subsystem] A question about function page_table_range_init_count()

[Hao Lee]

Hi, all

I encounter a problem when I read the source code of kernel 4.9.9.

In arch/x86/mm/init_32.c, at line 125 [1], there is a function named
page_table_range_init_count(...). I have analyzed some codes and find its
two parameters are PKMAP_BASE and FIXADDR_START.

Between Line 141 and Line 150, there is a for loop and I don't know what it
means, especially Line 144-Line147.

Could someone can give me some tips. Thanks a lot!

Here is the code:
[1]  http://lxr.free-electrons.com/source/arch/x86/mm/init_32.c?v=4.9#L125

Hao Lee
Thanks.
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