[RFC,0/2] mm/x86/pat: Fix two possible issues

Message

Peter Xu May 23, 2024, 10:37 p.m. UTC

I'm recently looking at the possibility of mapping PCIe large bars to use
huge mappings (just like thp or hugetlb).  Then I noticed these only when
reading the code.

I don't think I'm familiar enough with the whole PAT system, however I
figured I should post them out to collect some comments, hencing marking
this small series as RFC.

Please feel free to have a look at each of them; I've put more words in the
commit message than here, as the two issues are not related.  Any comments
are welcomed.

Thanks,

Peter Xu (2):
  mm/x86/pat: Only untrack the pfn range if unmap region
  mm/x86/pat: Do proper PAT bit shift for large mappings

 mm/huge_memory.c | 4 ++--
 mm/memory.c      | 5 ++---
 2 files changed, 4 insertions(+), 5 deletions(-)