a few minor fixes and improvements

Dong Aisheng (5):
  mm: correct SECTION_SHIFT name in code comments
  mm/sparse: free section usage memory in case populate_section_memmap
    failed
  mm/sparse: move mem_sections allocation out of memory_present()
  mm: rename the global section array to mem_sections
  mm/page_alloc: improve memmap_pages and dma_reserve dbg msg

 include/linux/mmzone.h            | 12 +++++-----
 include/linux/page-flags-layout.h |  3 +++
 kernel/crash_core.c               |  4 ++--
 mm/page_alloc.c                   |  5 +++--
 mm/sparse.c                       | 37 +++++++++++++++----------------
 5 files changed, 31 insertions(+), 30 deletions(-)

-- 
2.25.1