[PATCH v2 0/3] page table check fixes and cleanups

[Pasha Tatashin]

Changelog:
v2:	- Addressed simplification comments from Wei Xu
	- Added Review-by/Tested-by's from Zi Yan and Wei Xu


Two fixes:

  mm/debug_vm_pgtable: remove pte entry from the page table
	- remove a pte entry from the page table at the end of debug_vm_pgtable pte test

  mm/page_table_check: check entries at pud and pmd levels
	- check pmd and pud levels in page_table_check for regular entries not only for
	  huge pages when entries are replaced or cleared.
	  repro.c: https://gist.github.com/soleen/fdcd501d5df103976245fe84e9535087
	  config: https://gist.github.com/soleen/8a56f923c2fea9ce9c75b4e2517d4162
	  qemu_script: https://gist.github.com/soleen/f4be4795826b7ab1a51ae659582e179c
	  base image:
	  https://storage.googleapis.com/syzkaller/wheezy.img
	  https://storage.googleapis.com/syzkaller/wheezy.img.key

Small cleanup:
  mm/page_table_check: use unsigned long for page counters

Previous versions:
v1: https://lore.kernel.org/all/20220120042513.1648831-1-pasha.tatashin@xxxxxxxxxx

Pasha Tatashin (3):
  mm/debug_vm_pgtable: remove pte entry from the page table
  mm/page_table_check: check entries at pud and pmd levels
  mm/page_table_check: use unsigned long for page counters

 mm/debug_vm_pgtable.c |  2 ++
 mm/page_table_check.c | 68 +++++++++++++++++++++++++------------------
 2 files changed, 42 insertions(+), 28 deletions(-)

-- 
2.34.1.703.g22d0c6ccf7-goog