mm/memblock: use PAGE_ALIGN_DOWN to get pgend in free_memmap

Leverage the macro PAGE_ALIGN_DOWN to get pgend.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Link: https://lore.kernel.org/r/20240507075833.6346-7-richard.weiyang@gmail.comSigned-off-by: Mike Rapoport (IBM) <rppt@kernel.org>

mm/memblock.c

@@ -2039,7 +2039,7 @@ static void __init free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 	 * downwards.
 	 */
 	pg = PAGE_ALIGN(__pa(start_pg));
-	pgend = __pa(end_pg) & PAGE_MASK;
+	pgend = PAGE_ALIGN_DOWN(__pa(end_pg));
 
 	/*
 	 * If there are free pages between these, free the section of the

tools/include/linux/mm.h

@@ -12,6 +12,7 @@
 #define PHYS_ADDR_MAX	(~(phys_addr_t)0)
 
 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
+#define PAGE_ALIGN_DOWN(addr) ALIGN_DOWN(addr, PAGE_SIZE)
 
 #define __va(x) ((void *)((unsigned long)(x)))
 #define __pa(x) ((unsigned long)(x))