[PATCH 12/19] mm/x86/pat: Use the new follow_pfnmap API

[Peter Xu]

Use the new API that can understand huge pfn mappings.

Cc: x86@xxxxxxxxxx
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
 arch/x86/mm/pat/memtype.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index bdc2a240c2aa..fd210b362a04 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -951,23 +951,20 @@ static void free_pfn_range(u64 paddr, unsigned long size)
 static int follow_phys(struct vm_area_struct *vma, unsigned long *prot,
 		resource_size_t *phys)
 {
-	pte_t *ptep, pte;
-	spinlock_t *ptl;
+	struct follow_pfnmap_args args = { .vma = vma, .address = vma->vm_start };
 
-	if (follow_pte(vma, vma->vm_start, &ptep, &ptl))
+	if (follow_pfnmap_start(&args))
 		return -EINVAL;
 
-	pte = ptep_get(ptep);
-
 	/* Never return PFNs of anon folios in COW mappings. */
-	if (vm_normal_folio(vma, vma->vm_start, pte)) {
-		pte_unmap_unlock(ptep, ptl);
+	if (!args.special) {
+		follow_pfnmap_end(&args);
 		return -EINVAL;
 	}
 
-	*prot = pgprot_val(pte_pgprot(pte));
-	*phys = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
-	pte_unmap_unlock(ptep, ptl);
+	*prot = pgprot_val(args.pgprot);
+	*phys = (resource_size_t)args.pfn << PAGE_SHIFT;
+	follow_pfnmap_end(&args);
 	return 0;
 }
 
-- 
2.45.0