[0/3] Fixes "mm/sparsemem: support sub-section hotplug"

Message

Wei Yang Feb. 6, 2020, 11:16 p.m. UTC

During reviewing David's code, I found current sub-section hotplug is
broken in several places.

The following link fix one potential issue, while David and I still spot
some suspicious points.

https://lkml.org/lkml/2020/2/6/334

The problem here is mainly about the memmap manipulation:

  * memmap would be overwrite if not use SPARSEMEM_VMEMMAP
  * only need to adjust memmap for SPARSEMEM_VMEMMAP

Wei Yang (3):
  mm/sparsemem: adjust memmap only for SPARSEMEM_VMEMMAP
  mm/sparsemem: get physical address to page struct instead of virtual
    address to pfn
  mm/sparsemem: avoid memmap overwrite for non-SPARSEMEM_VMEMMAP

 mm/sparse.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)