h8300, nds32, openrisc: simplify detection of memory extents

Instead of traversing memblock.memory regions to find memory_start and
memory_end, simply query memblock_{start,end}_of_DRAM().

Signed-off-by: Mike Rapoport <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Stafford Horne <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Daniel Axtens <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Emil Renner Berthing <[email protected]>
Cc: Hari Bathini <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Max Filippov <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Miguel Ojeda <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Russell King <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

arch/h8300/kernel/setup.c

@@ -74,17 +74,15 @@ static void __init bootmem_init(void)
 	memory_end = memory_start = 0;
 
 	/* Find main memory where is the kernel */
-	for_each_memblock(memory, region) {
-		memory_start = region->base;
-		memory_end = region->base + region->size;
-	}
+	memory_start = memblock_start_of_DRAM();
+	memory_end = memblock_end_of_DRAM();
 
 	if (!memory_end)
 		panic("No memory!");
 
 	/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
 	min_low_pfn = PFN_UP(memory_start);
-	max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	max_low_pfn = PFN_DOWN(memory_end);
 	max_pfn = max_low_pfn;
 
 	memblock_reserve(__pa(_stext), _end - _stext);

arch/nds32/kernel/setup.c

@@ -249,12 +249,8 @@ static void __init setup_memory(void)
 	memory_end = memory_start = 0;
 
 	/* Find main memory where is the kernel */
-	for_each_memblock(memory, region) {
-		memory_start = region->base;
-		memory_end = region->base + region->size;
-		pr_info("%s: Memory: 0x%x-0x%x\n", __func__,
-			memory_start, memory_end);
-	}
+	memory_start = memblock_start_of_DRAM();
+	memory_end = memblock_end_of_DRAM();
 
 	if (!memory_end) {
 		panic("No memory!");

arch/openrisc/kernel/setup.c

@@ -48,17 +48,12 @@ static void __init setup_memory(void)
 	unsigned long ram_start_pfn;
 	unsigned long ram_end_pfn;
 	phys_addr_t memory_start, memory_end;
-	struct memblock_region *region;
 
 	memory_end = memory_start = 0;
 
 	/* Find main memory where is the kernel, we assume its the only one */
-	for_each_memblock(memory, region) {
-		memory_start = region->base;
-		memory_end = region->base + region->size;
-		printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
-		       memory_start, memory_end);
-	}
+	memory_start = memblock_start_of_DRAM();
+	memory_end = memblock_end_of_DRAM();
 
 	if (!memory_end) {
 		panic("No memory!");