[PATCH v2 01/15] MIPS: memblock: Add RESERVED_NOMAP memory flag

[Serge Semin]

Even if nomap flag is specified the reserved memory declared in dts
isn't really discarded from the buddy allocator in the current code.
We'll fix it by adding the no-map MIPS memory flag. Additionally
lets add the RESERVED_NOMAP memory regions handling to the methods,
which aren't going to be changed in the further patches.

Signed-off-by: Serge Semin <fancer.lancer@xxxxxxxxx>
---
 arch/mips/include/asm/bootinfo.h | 1 +
 arch/mips/kernel/prom.c          | 8 ++++++--
 arch/mips/kernel/setup.c         | 8 ++++++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h
index e26a093bb17a..276618b5319d 100644
--- a/arch/mips/include/asm/bootinfo.h
+++ b/arch/mips/include/asm/bootinfo.h
@@ -90,6 +90,7 @@ extern unsigned long mips_machtype;
 #define BOOT_MEM_ROM_DATA	2
 #define BOOT_MEM_RESERVED	3
 #define BOOT_MEM_INIT_RAM	4
+#define BOOT_MEM_RESERVED_NOMAP	5
 
 /*
  * A memory map that's built upon what was determined
diff --git a/arch/mips/kernel/prom.c b/arch/mips/kernel/prom.c
index 0dbcd152a1a9..b123eb8279cd 100644
--- a/arch/mips/kernel/prom.c
+++ b/arch/mips/kernel/prom.c
@@ -41,7 +41,7 @@ char *mips_get_machine_name(void)
 #ifdef CONFIG_USE_OF
 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 {
-	return add_memory_region(base, size, BOOT_MEM_RAM);
+	add_memory_region(base, size, BOOT_MEM_RAM);
 }
 
 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
@@ -52,7 +52,11 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
 					phys_addr_t size, bool nomap)
 {
-	add_memory_region(base, size, BOOT_MEM_RESERVED);
+	if (!nomap)
+		add_memory_region(base, size, BOOT_MEM_RESERVED);
+	else
+		add_memory_region(base, size, BOOT_MEM_RESERVED_NOMAP);
+
 	return 0;
 }
 
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 702c678de116..1a4d64410303 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -172,6 +172,7 @@ bool __init memory_region_available(phys_addr_t start, phys_addr_t size)
 				in_ram = true;
 			break;
 		case BOOT_MEM_RESERVED:
+		case BOOT_MEM_RESERVED_NOMAP:
 			if ((start >= start_ && start < end_) ||
 			    (start < start_ && start + size >= start_))
 				free = false;
@@ -207,6 +208,9 @@ static void __init print_memory_map(void)
 		case BOOT_MEM_RESERVED:
 			printk(KERN_CONT "(reserved)\n");
 			break;
+		case BOOT_MEM_RESERVED_NOMAP:
+			printk(KERN_CONT "(reserved nomap)\n");
+			break;
 		default:
 			printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 			break;
@@ -955,9 +959,13 @@ static void __init resource_init(void)
 			res->name = "System RAM";
 			res->flags |= IORESOURCE_SYSRAM;
 			break;
+		case BOOT_MEM_RESERVED_NOMAP:
+			res->name = "reserved nomap";
+			break;
 		case BOOT_MEM_RESERVED:
 		default:
 			res->name = "reserved";
+			break;
 		}
 
 		request_resource(&iomem_resource, res);
-- 
2.12.0