x86 PAT: change track_pfn_vma_new to take pgprot_t pointer param

Impact: cleanup

Change the protection parameter for track_pfn_vma_new() into a pgprot_t pointer.
Subsequent patch changes the x86 PAT handling to return a compatible
memtype in pgprot_t, if what was requested cannot be allowed due to conflicts.
No fuctionality change in this patch.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 3 deletions

diff --git a/mm/memory.c b/mm/memory.c
index d3ee2ea5615c..22bfa7a47a0b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1511,6 +1511,7 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
                         unsigned long pfn)
 {
         int ret;
+        pgprot_t pgprot = vma->vm_page_prot;
         /*
          * Technically, architectures with pte_special can avoid all these
          * restrictions (same for remap_pfn_range).  However we would like
@@ -1525,10 +1526,10 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
 
         if (addr < vma->vm_start || addr >= vma->vm_end)
                 return -EFAULT;
-        if (track_pfn_vma_new(vma, vma->vm_page_prot, pfn, PAGE_SIZE))
+        if (track_pfn_vma_new(vma, &pgprot, pfn, PAGE_SIZE))
                 return -EINVAL;
 
-        ret = insert_pfn(vma, addr, pfn, vma->vm_page_prot);
+        ret = insert_pfn(vma, addr, pfn, pgprot);
 
         if (ret)
                 untrack_pfn_vma(vma, pfn, PAGE_SIZE);
@@ -1671,7 +1672,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
 
         vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
 
-        err = track_pfn_vma_new(vma, prot, pfn, PAGE_ALIGN(size));
+        err = track_pfn_vma_new(vma, &prot, pfn, PAGE_ALIGN(size));
         if (err) {
                 /*
                  * To indicate that track_pfn related cleanup is not