On Wed, 2017-03-15 at 22:12 +0800, Hao Lee wrote: > 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! > The code iterates over the virtual memory addresses specified, and counts the number of pmds (second level page tables) that will be needed to map that address space.
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