[v6,0/4] Cleanup and fixups for vmemmap handling

Message

Oscar Salvador March 9, 2021, 9:40 p.m. UTC

Hi,

this series contains cleanups to remove dead code that handles
unaligned cases for 4K and 1GB pages (patch#1 and patch#2) when
removing the vemmmap range, and a fix (patch#3) to handle the case
when two vmemmap ranges intersect the same PMD.

More details can be found in the respective changelogs.
 
 v5 -> v6:
 - Fix some compilation errors when !CONFIG_MEMORY_HOTPLUG
   (Reported by Zi Yan)
 - Collect Acked-by from Dave

 v4 -> v5:
 - Rebase on top of 5.12-rc2
 - Addessed feedback from Dave
 - Split previous patch#3 into core-changes (current patch#3) and
   the optimization (current patch#4)
 - Document better what is unused_pmd_start and its optimization
 - Added Acked-by for patch#1

 v3 -> v4:
 - Rebase on top of 5.12-rc1 as Andrew suggested
 - Added last Reviewed-by for the last patch

 v2 -> v3:
 - Make sure we do not clear the PUD entry in case
   we are not removing the whole range.
 - Add Reviewed-by

 v1 -> v2:
 - Remove dead code in remove_pud_table as well
 - Addessed feedback by David
 - Place the vmemap functions that take care of unaligned PMDs
   within CONFIG_SPARSEMEM_VMEMMAP


Oscar Salvador (4):
  x86/vmemmap: Drop handling of 4K unaligned vmemmap range
  x86/vmemmap: Drop handling of 1GB vmemmap ranges
  x86/vmemmap: Handle unpopulated sub-pmd ranges
  x86/vmemmap: Optimize for consecutive sections in partial populated
    PMDs

 arch/x86/mm/init_64.c | 203 +++++++++++++++++++++++++++++++-------------------
 1 file changed, 128 insertions(+), 75 deletions(-)