1 files changed, 50 insertions, 25 deletions

diff --git a/mm/memblock.c b/mm/memblock.c
index d300f13..dd79899 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -96,13 +96,10 @@ bool __init_memblock memblock_overlaps_region(struct memblock_type *type,
 {
 	unsigned long i;
 
-	for (i = 0; i < type->cnt; i++) {
-		phys_addr_t rgnbase = type->regions[i].base;
-		phys_addr_t rgnsize = type->regions[i].size;
-		if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
+	for (i = 0; i < type->cnt; i++)
+		if (memblock_addrs_overlap(base, size, type->regions[i].base,
+					   type->regions[i].size))
 			break;
-	}
-
 	return i < type->cnt;
 }
 
@@ -528,7 +525,8 @@ int __init_memblock memblock_add_range(struct memblock_type *type,
 	bool insert = false;
 	phys_addr_t obase = base;
 	phys_addr_t end = base + memblock_cap_size(base, &size);
-	int i, nr_new;
+	int idx, nr_new;
+	struct memblock_region *rgn;
 
 	if (!size)
 		return 0;
@@ -552,8 +550,7 @@ repeat:
 	base = obase;
 	nr_new = 0;
 
-	for (i = 0; i < type->cnt; i++) {
-		struct memblock_region *rgn = &type->regions[i];
+	for_each_memblock_type(type, rgn) {
 		phys_addr_t rbase = rgn->base;
 		phys_addr_t rend = rbase + rgn->size;
 
@@ -572,7 +569,7 @@ repeat:
 			WARN_ON(flags != rgn->flags);
 			nr_new++;
 			if (insert)
-				memblock_insert_region(type, i++, base,
+				memblock_insert_region(type, idx++, base,
 						       rbase - base, nid,
 						       flags);
 		}
@@ -584,7 +581,7 @@ repeat:
 	if (base < end) {
 		nr_new++;
 		if (insert)
-			memblock_insert_region(type, i, base, end - base,
+			memblock_insert_region(type, idx, base, end - base,
 					       nid, flags);
 	}
 
@@ -651,7 +648,8 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
 					int *start_rgn, int *end_rgn)
 {
 	phys_addr_t end = base + memblock_cap_size(base, &size);
-	int i;
+	int idx;
+	struct memblock_region *rgn;
 
 	*start_rgn = *end_rgn = 0;
 
@@ -663,8 +661,7 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
 		if (memblock_double_array(type, base, size) < 0)
 			return -ENOMEM;
 
-	for (i = 0; i < type->cnt; i++) {
-		struct memblock_region *rgn = &type->regions[i];
+	for_each_memblock_type(type, rgn) {
 		phys_addr_t rbase = rgn->base;
 		phys_addr_t rend = rbase + rgn->size;
 
@@ -681,7 +678,7 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
 			rgn->base = base;
 			rgn->size -= base - rbase;
 			type->total_size -= base - rbase;
-			memblock_insert_region(type, i, rbase, base - rbase,
+			memblock_insert_region(type, idx, rbase, base - rbase,
 					       memblock_get_region_node(rgn),
 					       rgn->flags);
 		} else if (rend > end) {
@@ -692,14 +689,14 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
 			rgn->base = end;
 			rgn->size -= end - rbase;
 			type->total_size -= end - rbase;
-			memblock_insert_region(type, i--, rbase, end - rbase,
+			memblock_insert_region(type, idx--, rbase, end - rbase,
 					       memblock_get_region_node(rgn),
 					       rgn->flags);
 		} else {
 			/* @rgn is fully contained, record it */
 			if (!*end_rgn)
-				*start_rgn = i;
-			*end_rgn = i + 1;
+				*start_rgn = idx;
+			*end_rgn = idx + 1;
 		}
 	}
 
@@ -822,6 +819,17 @@ int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size)
 	return memblock_setclr_flag(base, size, 1, MEMBLOCK_MIRROR);
 }
 
+/**
+ * memblock_mark_nomap - Mark a memory region with flag MEMBLOCK_NOMAP.
+ * @base: the base phys addr of the region
+ * @size: the size of the region
+ *
+ * Return 0 on success, -errno on failure.
+ */
+int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size)
+{
+	return memblock_setclr_flag(base, size, 1, MEMBLOCK_NOMAP);
+}
 
 /**
  * __next_reserved_mem_region - next function for for_each_reserved_region()
@@ -913,6 +921,10 @@ void __init_memblock __next_mem_range(u64 *idx, int nid, ulong flags,
 		if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
 			continue;
 
+		/* skip nomap memory unless we were asked for it explicitly */
+		if (!(flags & MEMBLOCK_NOMAP) && memblock_is_nomap(m))
+			continue;
+
 		if (!type_b) {
 			if (out_start)
 				*out_start = m_start;
@@ -1022,6 +1034,10 @@ void __init_memblock __next_mem_range_rev(u64 *idx, int nid, ulong flags,
 		if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
 			continue;
 
+		/* skip nomap memory unless we were asked for it explicitly */
+		if (!(flags & MEMBLOCK_NOMAP) && memblock_is_nomap(m))
+			continue;
+
 		if (!type_b) {
 			if (out_start)
 				*out_start = m_start;
@@ -1432,7 +1448,7 @@ void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
  * Remaining API functions
  */
 
-phys_addr_t __init memblock_phys_mem_size(void)
+phys_addr_t __init_memblock memblock_phys_mem_size(void)
 {
 	return memblock.memory.total_size;
 }
@@ -1509,16 +1525,25 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr
 	return -1;
 }
 
-int __init memblock_is_reserved(phys_addr_t addr)
+bool __init memblock_is_reserved(phys_addr_t addr)
 {
 	return memblock_search(&memblock.reserved, addr) != -1;
 }
 
-int __init_memblock memblock_is_memory(phys_addr_t addr)
+bool __init_memblock memblock_is_memory(phys_addr_t addr)
 {
 	return memblock_search(&memblock.memory, addr) != -1;
 }
 
+int __init_memblock memblock_is_map_memory(phys_addr_t addr)
+{
+	int i = memblock_search(&memblock.memory, addr);
+
+	if (i == -1)
+		return false;
+	return !memblock_is_nomap(&memblock.memory.regions[i]);
+}
+
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
 			 unsigned long *start_pfn, unsigned long *end_pfn)
@@ -1613,12 +1638,12 @@ static void __init_memblock memblock_dump(struct memblock_type *type, char *name
 {
 	unsigned long long base, size;
 	unsigned long flags;
-	int i;
+	int idx;
+	struct memblock_region *rgn;
 
 	pr_info(" %s.cnt  = 0x%lx\n", name, type->cnt);
 
-	for (i = 0; i < type->cnt; i++) {
-		struct memblock_region *rgn = &type->regions[i];
+	for_each_memblock_type(type, rgn) {
 		char nid_buf[32] = "";
 
 		base = rgn->base;
@@ -1630,7 +1655,7 @@ static void __init_memblock memblock_dump(struct memblock_type *type, char *name
 				 memblock_get_region_node(rgn));
 #endif
 		pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes%s flags: %#lx\n",
-			name, i, base, base + size - 1, size, nid_buf, flags);
+			name, idx, base, base + size - 1, size, nid_buf, flags);
 	}
 }