mm/memory_hotplug: rename walk_memory_range() and pass start+size instead of pfns

walk_memory_range() was once used to iterate over sections.  Now, it
iterates over memory blocks.  Rename the function, fixup the
documentation.

Also, pass start+size instead of PFNs, which is what most callers
already have at hand.  (we'll rework link_mem_sections() most probably
soon)

Follow-up patches will rework, simplify, and move walk_memory_blocks()
to drivers/base/memory.c.

Note: walk_memory_blocks() only works correctly right now if the
start_pfn is aligned to a section start.  This is the case right now,
but we'll generalize the function in a follow up patch so the semantics
match the documentation.

[[email protected]: remove unused variable]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Rashmica Gupta <[email protected]>
Cc: Pavel Tatashin <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Michael Neuling <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Wei Yang <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Qian Cai <[email protected]>
Cc: Arun KS <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 27391f1e8f60..75b7e6f6535b 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -834,8 +834,9 @@ void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
 
 int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn)
 {
-	return walk_memory_range(start_pfn, end_pfn, (void *)&nid,
-					register_mem_sect_under_node);
+	return walk_memory_blocks(PFN_PHYS(start_pfn),
+				  PFN_PHYS(end_pfn - start_pfn), (void *)&nid,
+				  register_mem_sect_under_node);
 }
 
 #ifdef CONFIG_HUGETLBFS