[PATCH 2/4] mm: Remove mk_huge_pte()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

The only remaining user of mk_huge_pte() is the debug code, so remove
the API and replace its use with pfn_pte() which lets us remove the
conversion to a page first.  We should always call arch_make_huge_pte()
to turn this PTE into a huge PTE before operating on it with
huge_pte_mkdirty() etc.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/asm-generic/hugetlb.h |  5 -----
 mm/debug_vm_pgtable.c         | 18 +++++-------------
 2 files changed, 5 insertions(+), 18 deletions(-)

diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
index f42133dae68e..710b77a1e0e8 100644
--- a/include/asm-generic/hugetlb.h
+++ b/include/asm-generic/hugetlb.h
@@ -5,11 +5,6 @@
 #include <linux/swap.h>
 #include <linux/swapops.h>
 
-static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
-{
-	return mk_pte(page, pgprot);
-}
-
 static inline unsigned long huge_pte_write(pte_t pte)
 {
 	return pte_write(pte);
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index bc748f700a9e..7731b238b534 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -910,26 +910,18 @@ static void __init swap_migration_tests(struct pgtable_debug_args *args)
 #ifdef CONFIG_HUGETLB_PAGE
 static void __init hugetlb_basic_tests(struct pgtable_debug_args *args)
 {
-	struct page *page;
 	pte_t pte;
 
 	pr_debug("Validating HugeTLB basic\n");
-	/*
-	 * Accessing the page associated with the pfn is safe here,
-	 * as it was previously derived from a real kernel symbol.
-	 */
-	page = pfn_to_page(args->fixed_pmd_pfn);
-	pte = mk_huge_pte(page, args->page_prot);
+	pte = pfn_pte(args->fixed_pmd_pfn, args->page_prot);
+	pte = arch_make_huge_pte(pte, PMD_SHIFT, VM_ACCESS_FLAGS);
 
+#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
+	WARN_ON(!pte_huge(pte));
+#endif
 	WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte)));
 	WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte))));
 	WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte))));
-
-#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
-	pte = pfn_pte(args->fixed_pmd_pfn, args->page_prot);
-
-	WARN_ON(!pte_huge(arch_make_huge_pte(pte, PMD_SHIFT, VM_ACCESS_FLAGS)));
-#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
 }
 #else  /* !CONFIG_HUGETLB_PAGE */
 static void __init hugetlb_basic_tests(struct pgtable_debug_args *args) { }
-- 
2.47.2