x86: PAT: hooks in generic vm code to help archs to track pfnmap regions - v3
Impact: Introduces new hooks, which are currently null.
Introduce generic hooks in remap_pfn_range and vm_insert_pfn and
corresponding copy and free routines with reserve and free tracking.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/include/linux/mm.h b/include/linux/mm.h
index a25024f..87ecb40 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -155,6 +155,12 @@
return (vma->vm_flags & VM_PFNMAP);
}
+extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
+ unsigned long pfn, unsigned long size);
+extern int track_pfn_vma_copy(struct vm_area_struct *vma);
+extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
+ unsigned long size);
+
/*
* vm_fault is filled by the the pagefault handler and passed to the vma's
* ->fault function. The vma's ->fault is responsible for returning a bitmask