docs/mm: nobootmem: fixup kernel-doc comments

* add kernel-doc marking to free_bootmem_late() description
* add return value descriptions
* mention that address parameter of free_bootmem{_node} is a physical address
Signed-off-by: NMike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

mm/nobootmem.c

@@ -72,7 +72,7 @@ static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
 	return ptr;
 }
 
-/*
+/**
  * free_bootmem_late - free bootmem pages directly to page allocator
  * @addr: starting address of the range
  * @size: size of the range in bytes
@@ -176,7 +176,7 @@ void __init reset_all_zones_managed_pages(void)
 /**
  * free_all_bootmem - release free pages to the buddy allocator
  *
- * Returns the number of pages actually released.
+ * Return: the number of pages actually released.
  */
 unsigned long __init free_all_bootmem(void)
 {
@@ -193,7 +193,7 @@ unsigned long __init free_all_bootmem(void)
 /**
  * free_bootmem_node - mark a page range as usable
  * @pgdat: node the range resides on
- * @physaddr: starting address of the range
+ * @physaddr: starting physical address of the range
  * @size: size of the range in bytes
  *
  * Partial pages will be considered reserved and left as they are.
@@ -208,7 +208,7 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 
 /**
  * free_bootmem - mark a page range as usable
- * @addr: starting address of the range
+ * @addr: starting physical address of the range
  * @size: size of the range in bytes
  *
  * Partial pages will be considered reserved and left as they are.
@@ -256,7 +256,7 @@ static void * __init ___alloc_bootmem_nopanic(unsigned long size,
  *
  * Allocation may happen on any node in the system.
  *
- * Returns NULL on failure.
+ * Return: address of the allocated region or %NULL on failure.
  */
 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 					unsigned long goal)
@@ -293,6 +293,8 @@ static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
  * Allocation may happen on any node in the system.
  *
  * The function panics if the request can not be satisfied.
+ *
+ * Return: address of the allocated region.
  */
 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 			      unsigned long goal)
@@ -367,6 +369,8 @@ static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
  * can not hold the requested memory.
  *
  * The function panics if the request can not be satisfied.
+ *
+ * Return: address of the allocated region.
  */
 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 				   unsigned long align, unsigned long goal)
@@ -396,6 +400,8 @@ void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
  * Allocation may happen on any node in the system.
  *
  * The function panics if the request can not be satisfied.
+ *
+ * Return: address of the allocated region.
  */
 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 				  unsigned long goal)
@@ -425,6 +431,8 @@ void * __init __alloc_bootmem_low_nopanic(unsigned long size,
  * can not hold the requested memory.
  *
  * The function panics if the request can not be satisfied.
+ *
+ * Return: address of the allocated region.
  */
 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 				       unsigned long align, unsigned long goal)