From: Nathan Fontenot <nfont@austin.ibm.com>
Date: Sun, 19 Oct 2008 03:27:14 +0000 (-0700)
Subject: memory hotplug: release memory regions in PAGES_PER_SECTION chunks
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=de7f0cba96786cf9ec9da4532c1b25f733da9b6f;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

memory hotplug: release memory regions in PAGES_PER_SECTION chunks

During hotplug memory remove, memory regions should be released on a
PAGES_PER_SECTION size chunks.  This mirrors the code in add_memory where
resources are requested on a PAGES_PER_SECTION size.

Attempting to release the entire memory region fails because there is not
a single resource for the total number of pages being removed.  Instead
the resources for the pages are split in PAGES_PER_SECTION size chunks as
requested during memory add.

Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 3b4975815141..6837a1014372 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -324,11 +324,11 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
 	BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
 	BUG_ON(nr_pages % PAGES_PER_SECTION);
 
-	release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE);
-
 	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;
+		release_mem_region(pfn << PAGE_SHIFT,
+				   PAGES_PER_SECTION << PAGE_SHIFT);
 		ret = __remove_section(zone, __pfn_to_section(pfn));
 		if (ret)
 			break;