[PATCH v4 1/6] mm: debug_vm_pgtable: add debug_vm_pgtable_free_huge_page()

[Kefeng Wang <wangkefeng.wang@huawei.com>]

Add a new helper to free huge page to be consistency to
debug_vm_pgtable_alloc_huge_page(), and use HPAGE_PUD_ORDER
instead of open-code.

Also move the free_contig_range() under CONFIG_ALLOC_CONTIG
since all caller are built with CONFIG_ALLOC_CONTIG.

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 include/linux/gfp.h   |  2 +-
 mm/debug_vm_pgtable.c | 38 +++++++++++++++++---------------------
 mm/page_alloc.c       |  2 +-
 3 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index b155929af5b1..ea053f1cfa16 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -438,8 +438,8 @@ extern struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_
 					      int nid, nodemask_t *nodemask);
 #define alloc_contig_pages(...)			alloc_hooks(alloc_contig_pages_noprof(__VA_ARGS__))
 
-#endif
 void free_contig_range(unsigned long pfn, unsigned long nr_pages);
+#endif
 
 #ifdef CONFIG_CONTIG_ALLOC
 static inline struct folio *folio_alloc_gigantic_noprof(int order, gfp_t gfp,
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index ae9b9310d96f..83cf07269f13 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -971,22 +971,26 @@ static unsigned long __init get_random_vaddr(void)
 	return random_vaddr;
 }
 
-static void __init destroy_args(struct pgtable_debug_args *args)
+static void __init
+debug_vm_pgtable_free_huge_page(struct pgtable_debug_args *args,
+		unsigned long pfn, int order)
 {
-	struct page *page = NULL;
+#ifdef CONFIG_CONTIG_ALLOC
+	if (args->is_contiguous_page) {
+		free_contig_range(pfn, 1 << order);
+		return;
+	}
+#endif
+	__free_pages(pfn_to_page(pfn), order);
+}
 
+static void __init destroy_args(struct pgtable_debug_args *args)
+{
 	/* Free (huge) page */
 	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
 	    has_transparent_pud_hugepage() &&
 	    args->pud_pfn != ULONG_MAX) {
-		if (args->is_contiguous_page) {
-			free_contig_range(args->pud_pfn,
-					  (1 << (HPAGE_PUD_SHIFT - PAGE_SHIFT)));
-		} else {
-			page = pfn_to_page(args->pud_pfn);
-			__free_pages(page, HPAGE_PUD_SHIFT - PAGE_SHIFT);
-		}
-
+		debug_vm_pgtable_free_huge_page(args, args->pud_pfn, HPAGE_PUD_ORDER);
 		args->pud_pfn = ULONG_MAX;
 		args->pmd_pfn = ULONG_MAX;
 		args->pte_pfn = ULONG_MAX;
@@ -995,20 +999,13 @@ static void __init destroy_args(struct pgtable_debug_args *args)
 	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
 	    has_transparent_hugepage() &&
 	    args->pmd_pfn != ULONG_MAX) {
-		if (args->is_contiguous_page) {
-			free_contig_range(args->pmd_pfn, (1 << HPAGE_PMD_ORDER));
-		} else {
-			page = pfn_to_page(args->pmd_pfn);
-			__free_pages(page, HPAGE_PMD_ORDER);
-		}
-
+		debug_vm_pgtable_free_huge_page(args, args->pmd_pfn, HPAGE_PMD_ORDER);
 		args->pmd_pfn = ULONG_MAX;
 		args->pte_pfn = ULONG_MAX;
 	}
 
 	if (args->pte_pfn != ULONG_MAX) {
-		page = pfn_to_page(args->pte_pfn);
-		__free_page(page);
+		__free_page(pfn_to_page(args->pte_pfn));
 
 		args->pte_pfn = ULONG_MAX;
 	}
@@ -1242,8 +1239,7 @@ static int __init init_args(struct pgtable_debug_args *args)
 	 */
 	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
 	    has_transparent_pud_hugepage()) {
-		page = debug_vm_pgtable_alloc_huge_page(args,
-				HPAGE_PUD_SHIFT - PAGE_SHIFT);
+		page = debug_vm_pgtable_alloc_huge_page(args, HPAGE_PUD_ORDER);
 		if (page) {
 			args->pud_pfn = page_to_pfn(page);
 			args->pmd_pfn = args->pud_pfn;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5bb3a7844abb..da32397b4313 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7180,7 +7180,6 @@ struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_mask,
 	}
 	return NULL;
 }
-#endif /* CONFIG_CONTIG_ALLOC */
 
 void free_contig_range(unsigned long pfn, unsigned long nr_pages)
 {
@@ -7207,6 +7206,7 @@ void free_contig_range(unsigned long pfn, unsigned long nr_pages)
 	WARN(count != 0, "%lu pages are still in use!\n", count);
 }
 EXPORT_SYMBOL(free_contig_range);
+#endif /* CONFIG_CONTIG_ALLOC */
 
 /*
  * Effectively disable pcplists for the zone by setting the high limit to 0
-- 
2.27.0