memblock: drop redundant 'struct page *' argument from memblock_free_pages()

memblock_free_pages() currently takes both a struct page * and the
corresponding PFN. The page pointer is always derived from the PFN at
call sites (pfn_to_page(pfn)), making the parameter redundant and also
allowing accidental mismatches between the two arguments.

Simplify the interface by removing the struct page * argument and
deriving the page locally from the PFN, after the deferred struct page
initialization check. This keeps the behavior unchanged while making
the helper harder to misuse.

Signed-off-by: Shengming Hu <hu.shengming@zte.com.cn>
Reviewed-by: David Hildenbrand (Red Hat) <david@kernel.org>
Link: https://patch.msgid.link/tencent_F741CE6ECC49EE099736685E60C0DBD4A209@qq.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

Author: HSM6236

mm/internal.h

@@ -742,8 +742,7 @@ static inline void clear_zone_contiguous(struct zone *zone)
 extern int __isolate_free_page(struct page *page, unsigned int order);
 extern void __putback_isolated_page(struct page *page, unsigned int order,
 				    int mt);
-extern void memblock_free_pages(struct page *page, unsigned long pfn,
-					unsigned int order);
+extern void memblock_free_pages(unsigned long pfn, unsigned int order);
 extern void __free_pages_core(struct page *page, unsigned int order,
 		enum meminit_context context);
 

mm/memblock.c

@@ -1771,7 +1771,7 @@ void __init memblock_free_late(phys_addr_t base, phys_addr_t size)
 	end = PFN_DOWN(base + size);
 
 	for (; cursor < end; cursor++) {
-		memblock_free_pages(pfn_to_page(cursor), cursor, 0);
+		memblock_free_pages(cursor, 0);
 		totalram_pages_inc();
 	}
 }
@@ -2216,7 +2216,7 @@ static void __init __free_pages_memory(unsigned long start, unsigned long end)
 		while (start + (1UL << order) > end)
 			order--;
 
-		memblock_free_pages(pfn_to_page(start), start, order);
+		memblock_free_pages(start, order);
 
 		start += (1UL << order);
 	}

mm/mm_init.c

@@ -2480,9 +2480,10 @@ void *__init alloc_large_system_hash(const char *tablename,
 	return table;
 }
 
-void __init memblock_free_pages(struct page *page, unsigned long pfn,
-							unsigned int order)
+void __init memblock_free_pages(unsigned long pfn, unsigned int order)
 {
+	struct page *page = pfn_to_page(pfn);
+
 	if (IS_ENABLED(CONFIG_DEFERRED_STRUCT_PAGE_INIT)) {
 		int nid = early_pfn_to_nid(pfn);
 

tools/testing/memblock/internal.h

@@ -15,8 +15,7 @@ bool mirrored_kernelcore = false;
 
 struct page {};
 
-void memblock_free_pages(struct page *page, unsigned long pfn,
-			 unsigned int order)
+void memblock_free_pages(unsigned long pfn, unsigned int order)
 {
 }