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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2006-08-05 12:15:01 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-06 08:57:48 -0700
commit58c1b5b079071d82b2f924000b7e8fb5585ce7d8 (patch)
tree74178ceb6462b68cba9f1b144d450dafcaf01c22
parent0f04ab5efbca73ab366a156d96b073d2da35b158 (diff)
downloadop-kernel-dev-58c1b5b079071d82b2f924000b7e8fb5585ce7d8.zip
op-kernel-dev-58c1b5b079071d82b2f924000b7e8fb5585ce7d8.tar.gz
[PATCH] memory hotadd fixes: find_next_system_ram catch range fix
find_next_system_ram() is used to find available memory resource at onlining newly added memory. This patch fixes following problem. find_next_system_ram() cannot catch this case. Resource: (start)-------------(end) Section : (start)-------------(end) Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Keith Mannthey <kmannth@gmail.com> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--kernel/resource.c3
-rw-r--r--mm/memory_hotplug.c2
2 files changed, 3 insertions, 2 deletions
diff --git a/kernel/resource.c b/kernel/resource.c
index 63e8793..4628643 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -244,6 +244,7 @@ int find_next_system_ram(struct resource *res)
start = res->start;
end = res->end;
+ BUG_ON(start >= end);
read_lock(&resource_lock);
for (p = iomem_resource.child; p ; p = p->sibling) {
@@ -254,7 +255,7 @@ int find_next_system_ram(struct resource *res)
p = NULL;
break;
}
- if (p->start >= start)
+ if ((p->end >= start) && (p->start < end))
break;
}
read_unlock(&resource_lock);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7d25cc1..26f1840 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -163,7 +163,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
res.flags = IORESOURCE_MEM; /* we just need system ram */
section_end = res.end;
- while (find_next_system_ram(&res) >= 0) {
+ while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) {
start_pfn = (unsigned long)(res.start >> PAGE_SHIFT);
nr_pages = (unsigned long)
((res.end + 1 - res.start) >> PAGE_SHIFT);
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