From: Yasuaki Ishimatsu <isimatu.yasu...@jp.fujitsu.com>

The patch adds __remove_pages() to remove_memory(). Then the range of
phys_start_pfn argument and nr_pages argument in __remove_pagse() may
have different zone. So zone argument is removed from __remove_pages()
and __remove_pages() caluculates zone in each section.

When CONFIG_SPARSEMEM_VMEMMAP is defined, there is no way to remove a memmap.
So __remove_section only calls unregister_memory_section().

CC: David Rientjes <rient...@google.com>
CC: Jiang Liu <liu...@gmail.com>
CC: Len Brown <len.br...@intel.com>
CC: Benjamin Herrenschmidt <b...@kernel.crashing.org>
CC: Paul Mackerras <pau...@samba.org>
CC: Christoph Lameter <c...@linux.com>
Cc: Minchan Kim <minchan....@gmail.com>
CC: Andrew Morton <a...@linux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motoh...@jp.fujitsu.com>
CC: Wen Congyang <we...@cn.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasu...@jp.fujitsu.com>
---
 arch/powerpc/platforms/pseries/hotplug-memory.c |    5 +----
 include/linux/memory_hotplug.h                  |    3 +--
 mm/memory_hotplug.c                             |   18 +++++++++++-------
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c 
b/arch/powerpc/platforms/pseries/hotplug-memory.c
index dc0a035..cc14da4 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -76,7 +76,6 @@ unsigned long memory_block_size_bytes(void)
 static int pseries_remove_memblock(unsigned long base, unsigned int 
memblock_size)
 {
        unsigned long start, start_pfn;
-       struct zone *zone;
        int i, ret;
        int sections_to_remove;
 
@@ -87,8 +86,6 @@ static int pseries_remove_memblock(unsigned long base, 
unsigned int memblock_siz
                return 0;
        }
 
-       zone = page_zone(pfn_to_page(start_pfn));
-
        /*
         * Remove section mappings and sysfs entries for the
         * section of the memory we are removing.
@@ -101,7 +98,7 @@ static int pseries_remove_memblock(unsigned long base, 
unsigned int memblock_siz
        sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
        for (i = 0; i < sections_to_remove; i++) {
                unsigned long pfn = start_pfn + i * PAGES_PER_SECTION;
-               ret = __remove_pages(zone, start_pfn,  PAGES_PER_SECTION);
+               ret = __remove_pages(start_pfn,  PAGES_PER_SECTION);
                if (ret)
                        return ret;
        }
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index fd84ea9..8bf820d 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -90,8 +90,7 @@ extern bool is_pageblock_removable_nolock(struct page *page);
 /* reasonably generic interface to expand the physical pages in a zone  */
 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
        unsigned long nr_pages);
-extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
-       unsigned long nr_pages);
+extern int __remove_pages(unsigned long start_pfn, unsigned long nr_pages);
 
 #ifdef CONFIG_NUMA
 extern int memory_add_physaddr_to_nid(u64 start);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 29aff4d..713f1b9 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -275,11 +275,14 @@ static int __meminit __add_section(int nid, struct zone 
*zone,
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 static int __remove_section(struct zone *zone, struct mem_section *ms)
 {
-       /*
-        * XXX: Freeing memmap with vmemmap is not implement yet.
-        *      This should be removed later.
-        */
-       return -EBUSY;
+       int ret = -EINVAL;
+
+       if (!valid_section(ms))
+               return ret;
+
+       ret = unregister_memory_section(ms);
+
+       return ret;
 }
 #else
 static int __remove_section(struct zone *zone, struct mem_section *ms)
@@ -346,11 +349,11 @@ EXPORT_SYMBOL_GPL(__add_pages);
  * sure that pages are marked reserved and zones are adjust properly by
  * calling offline_pages().
  */
-int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
-                unsigned long nr_pages)
+int __remove_pages(unsigned long phys_start_pfn, unsigned long nr_pages)
 {
        unsigned long i, ret = 0;
        int sections_to_remove;
+       struct zone *zone;
 
        /*
         * We can only remove entire sections
@@ -363,6 +366,7 @@ int __remove_pages(struct zone *zone, unsigned long 
phys_start_pfn,
        sections_to_remove = nr_pages / PAGES_PER_SECTION;
        for (i = 0; i < sections_to_remove; i++) {
                unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
+               zone = page_zone(pfn_to_page(pfn));
                ret = __remove_section(zone, __pfn_to_section(pfn));
                if (ret)
                        break;
-- 
1.7.1

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