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Subject[PATCH 5/8] mm: Let sparse_{add,remove}_one_section receive a node_id
From: Yigal Korman <yigal@plexistor.com>

Refactored the arguments of sparse_add_one_section / sparse_remove_one_section
to use node id instead of struct zone * - A memory section has no direct
connection to zones, all that was needed from zone was the node id.

This is for add_persistent_memory that will want a section of pages
allocated but without any zone associated. This is because belonging
to a zone will give the memory to the page allocators, but
persistent_memory belongs to a block device, and is not available for
regular volatile usage.

Signed-off-by: Yigal Korman <yigal@plexistor.com>
Signed-off-by: Boaz Harrosh <boaz@plexistor.com>
---
include/linux/memory_hotplug.h | 4 ++--
mm/memory_hotplug.c | 4 ++--
mm/sparse.c | 9 +++++----
3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 8f1a419..77ca3a4 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -265,8 +265,8 @@ extern int arch_add_memory(int nid, u64 start, u64 size);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
extern bool is_memblock_offlined(struct memory_block *mem);
extern void remove_memory(int nid, u64 start, u64 size);
-extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
-extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
+extern int sparse_add_one_section(int nid, unsigned long start_pfn);
+extern void sparse_remove_one_section(int nid, struct mem_section *ms);
extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
unsigned long pnum);

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9fab107..7a73d30 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -472,7 +472,7 @@ static int __meminit __add_section(int nid, struct zone *zone,
if (pfn_valid(phys_start_pfn))
return -EEXIST;

- ret = sparse_add_one_section(zone, phys_start_pfn);
+ ret = sparse_add_one_section(zone->zone_pgdat->node_id, phys_start_pfn);

if (ret < 0)
return ret;
@@ -738,7 +738,7 @@ static int __remove_section(struct zone *zone, struct mem_section *ms)
start_pfn = section_nr_to_pfn(scn_nr);
__remove_zone(zone, start_pfn);

- sparse_remove_one_section(zone, ms);
+ sparse_remove_one_section(zone->zone_pgdat->node_id, ms);
return 0;
}

diff --git a/mm/sparse.c b/mm/sparse.c
index d1b48b6..12a10ab 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -690,10 +690,10 @@ static void free_map_bootmem(struct page *memmap)
* set. If this is <=0, then that means that the passed-in
* map was not consumed and must be freed.
*/
-int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
+int __meminit sparse_add_one_section(int nid, unsigned long start_pfn)
{
unsigned long section_nr = pfn_to_section_nr(start_pfn);
- struct pglist_data *pgdat = zone->zone_pgdat;
+ struct pglist_data *pgdat = NODE_DATA(nid);
struct mem_section *ms;
struct page *memmap;
unsigned long *usemap;
@@ -788,11 +788,11 @@ static void free_section_usemap(struct page *memmap, unsigned long *usemap)
free_map_bootmem(memmap);
}

-void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
+void sparse_remove_one_section(int nid, struct mem_section *ms)
{
struct page *memmap = NULL;
unsigned long *usemap = NULL, flags;
- struct pglist_data *pgdat = zone->zone_pgdat;
+ struct pglist_data *pgdat = NODE_DATA(nid);

pgdat_resize_lock(pgdat, &flags);
if (ms->section_mem_map) {
@@ -807,5 +807,6 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
clear_hwpoisoned_pages(memmap, PAGES_PER_SECTION);
free_section_usemap(memmap, usemap);
}
+
#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_MEMORY_HOTPLUG */
--
1.9.3


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