mm/x86/pat: use the new follow_pfnmap API

jira LE-3557
Rebuild_History Non-Buildable kernel-5.14.0-570.26.1.el9_6
commit-author Peter Xu <[email protected]>
commit cbea853
Empty-Commit: Cherry-Pick Conflicts during history rebuild.
Will be included in final tarball splat. Ref for failed cherry-pick at:
ciq/ciq_backports/kernel-5.14.0-570.26.1.el9_6/cbea8536.failed

Use the new API that can understand huge pfn mappings.

Link: https://lkml.kernel.org/r/[email protected]
	Signed-off-by: Peter Xu <[email protected]>
	Cc: Thomas Gleixner <[email protected]>
	Cc: Ingo Molnar <[email protected]>
	Cc: Borislav Petkov <[email protected]>
	Cc: Dave Hansen <[email protected]>
	Cc: Alexander Gordeev <[email protected]>
	Cc: Alex Williamson <[email protected]>
	Cc: Aneesh Kumar K.V <[email protected]>
	Cc: Catalin Marinas <[email protected]>
	Cc: Christian Borntraeger <[email protected]>
	Cc: David Hildenbrand <[email protected]>
	Cc: Gavin Shan <[email protected]>
	Cc: Gerald Schaefer <[email protected]>
	Cc: Heiko Carstens <[email protected]>
	Cc: Jason Gunthorpe <[email protected]>
	Cc: Matthew Wilcox <[email protected]>
	Cc: Niklas Schnelle <[email protected]>
	Cc: Paolo Bonzini <[email protected]>
	Cc: Ryan Roberts <[email protected]>
	Cc: Sean Christopherson <[email protected]>
	Cc: Sven Schnelle <[email protected]>
	Cc: Vasily Gorbik <[email protected]>
	Cc: Will Deacon <[email protected]>
	Cc: Zi Yan <[email protected]>
	Signed-off-by: Andrew Morton <[email protected]>
(cherry picked from commit cbea853)
	Signed-off-by: Jonathan Maple <[email protected]>

# Conflicts:
#	arch/x86/mm/pat/memtype.c

Author: PlaidCat

ciq/ciq_backports/kernel-5.14.0-570.26.1.el9_6/cbea8536.failed

@@ -0,0 +1,78 @@
+mm/x86/pat: use the new follow_pfnmap API
+
+jira LE-3557
+Rebuild_History Non-Buildable kernel-5.14.0-570.26.1.el9_6
+commit-author Peter Xu <[email protected]>
+commit cbea8536d933d546ceb1005bf9c04f9d01da8092
+Empty-Commit: Cherry-Pick Conflicts during history rebuild.
+Will be included in final tarball splat. Ref for failed cherry-pick at:
+ciq/ciq_backports/kernel-5.14.0-570.26.1.el9_6/cbea8536.failed
+
+Use the new API that can understand huge pfn mappings.
+
+Link: https://lkml.kernel.org/r/[email protected]
+	Signed-off-by: Peter Xu <[email protected]>
+	Cc: Thomas Gleixner <[email protected]>
+	Cc: Ingo Molnar <[email protected]>
+	Cc: Borislav Petkov <[email protected]>
+	Cc: Dave Hansen <[email protected]>
+	Cc: Alexander Gordeev <[email protected]>
+	Cc: Alex Williamson <[email protected]>
+	Cc: Aneesh Kumar K.V <[email protected]>
+	Cc: Catalin Marinas <[email protected]>
+	Cc: Christian Borntraeger <[email protected]>
+	Cc: David Hildenbrand <[email protected]>
+	Cc: Gavin Shan <[email protected]>
+	Cc: Gerald Schaefer <[email protected]>
+	Cc: Heiko Carstens <[email protected]>
+	Cc: Jason Gunthorpe <[email protected]>
+	Cc: Matthew Wilcox <[email protected]>
+	Cc: Niklas Schnelle <[email protected]>
+	Cc: Paolo Bonzini <[email protected]>
+	Cc: Ryan Roberts <[email protected]>
+	Cc: Sean Christopherson <[email protected]>
+	Cc: Sven Schnelle <[email protected]>
+	Cc: Vasily Gorbik <[email protected]>
+	Cc: Will Deacon <[email protected]>
+	Cc: Zi Yan <[email protected]>
+	Signed-off-by: Andrew Morton <[email protected]>
+(cherry picked from commit cbea8536d933d546ceb1005bf9c04f9d01da8092)
+	Signed-off-by: Jonathan Maple <[email protected]>
+
+# Conflicts:
+#	arch/x86/mm/pat/memtype.c
+diff --cc arch/x86/mm/pat/memtype.c
+index 36b603d0cdde,f73b5ce270b3..000000000000
+--- a/arch/x86/mm/pat/memtype.c
++++ b/arch/x86/mm/pat/memtype.c
+@@@ -947,6 -948,26 +947,29 @@@ static void free_pfn_range(u64 paddr, u
+  		memtype_free(paddr, paddr + size);
+  }
+  
+++<<<<<<< HEAD
+++=======
++ static int follow_phys(struct vm_area_struct *vma, unsigned long *prot,
++ 		resource_size_t *phys)
++ {
++ 	struct follow_pfnmap_args args = { .vma = vma, .address = vma->vm_start };
++ 
++ 	if (follow_pfnmap_start(&args))
++ 		return -EINVAL;
++ 
++ 	/* Never return PFNs of anon folios in COW mappings. */
++ 	if (!args.special) {
++ 		follow_pfnmap_end(&args);
++ 		return -EINVAL;
++ 	}
++ 
++ 	*prot = pgprot_val(args.pgprot);
++ 	*phys = (resource_size_t)args.pfn << PAGE_SHIFT;
++ 	follow_pfnmap_end(&args);
++ 	return 0;
++ }
++ 
+++>>>>>>> cbea8536d933 (mm/x86/pat: use the new follow_pfnmap API)
+  static int get_pat_info(struct vm_area_struct *vma, resource_size_t *paddr,
+  		pgprot_t *pgprot)
+  {
+* Unmerged path arch/x86/mm/pat/memtype.c