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

Peter Xu
2024-08-09T16:09:45Z

Use the new API that can understand huge pfn mappings.

Cc: x86@kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
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