x86/mm: factor out of top-down direct mapping setup

Create a new function memory_map_top_down to factor out of the top-down
direct memory mapping pagetable setup.  This is also a preparation for the
following patch, which will introduce the bottom-up memory mapping.  That
said, we will put the two ways of pagetable setup into separate functions,
and choose to use which way in init_mem_mapping, which makes the code more
clear.

Signed-off-by: Tang Chen <[email protected]>
Signed-off-by: Zhang Yanfei <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Acked-by: Toshi Kani <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Wanpeng Li <[email protected]>
Cc: Thomas Renninger <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Wen Congyang <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Cc: Taku Izumi <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Michal Nazarewicz <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Kamezawa Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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