[PATCH 0/2] Change PAT to support mremap use-cases

[Toshi Kani]

This patch-set fixes issues found in the pfn tracking code of PAT
when mremap() is used on a VM_PFNMAP range.

Patch 1/2 changes untrack_pfn() to handle the case of mremap() with
MREMAP_FIXED, i.e. remapping virtual address on a VM_PFNMAP range.

Patch 2/2 changes the free_memtype() path to handle the case of
mremap() that shrinks the size of a VM_PFNMAP range.

Note, mremap() to expand the size of a VM_PFNMAP range is not a valid
case as VM_DONTEXPAND is set along with VM_PFNMAP.

---
Toshi Kani (2):
 1/2 x86/mm/pat: Change untrack_pfn() to handle unmapped vma
 2/2 x86/mm/pat: Change free_memtype() to free shrinking range

---
 arch/x86/mm/pat.c        | 19 ++++++++++++-------
 arch/x86/mm/pat_rbtree.c | 46 +++++++++++++++++++++++++++++++++++++---------
 2 files changed, 49 insertions(+), 16 deletions(-)
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