[PATCH -v16 00/35] Use lmb with x86

[Yinghai Lu]

the new lmb could be used to replace early_res in x86.

Suggested by: David, Ben, and Thomas

-v6: change sequence as requested by Thomas
-v7: seperate them to more patches
-v8: add boundary checking to make sure not free partial page.
-v9: use lmb_debug to control print out of reserve_lmb.
     add e820 clean up, and e820 become __initdata
-v10:use lmb.rmo_size and ARCH_DISCARD_LMB according to Michael
     change name to lmb_find_area/reserve_lmb_area/free_lmb_area,
      according to Michael
     update find_lmb_area to use __lmb_alloc_base according to ben
-v11:move find_lmb_area_size back to x86.
     x86 has own find_lmb_area, and could be disabled by ARCH_LMB_FIND_AREA
      because _lmb_find_base has different behavoir from x86's old one.
      one from high to high and one from low to high
      need more test
     tested for x86 32bit/64bit, numa/nonuma, nobootmem/bootmem.
-v12:refresh the series with current tip
     seperate nobootmem.c, so could remove some #ifdef
     still keep CONFIG_NO_BOOTMEM, in x86 .c, and could use the as tags
     so other lmb could refer them to use NO_BOOTMEM.

-v14:refresh to current tip

-v15:remove x86 version lmb_find_area
     remove other nobootmem and x86 e820 from this patchset

-v16: rebase to Ben's cleanup powerpc/lmb
     move back most func back to arch/x86/mm/lmb.c

this patches is based on tip/master+powerpc/lmb

todo:
	1. use for_each_lmb to replace for cycle
	2. replace range handling with lmb.

Thanks

Yinghai
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