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 <[email protected]>
kernel/resource.c | 3 ++-
mm/memory_hotplug.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
Index: linux-2.6.18-rc3/kernel/resource.c
===================================================================
--- linux-2.6.18-rc3.orig/kernel/resource.c 2006-08-01 16:38:45.000000000 +0900
+++ linux-2.6.18-rc3/kernel/resource.c 2006-08-01 16:38:56.000000000 +0900
@@ -244,6 +244,7 @@
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 @@
p = NULL;
break;
}
- if (p->start >= start)
+ if ((p->end >= start) && (p->start < end))
break;
}
read_unlock(&resource_lock);
Index: linux-2.6.18-rc3/mm/memory_hotplug.c
===================================================================
--- linux-2.6.18-rc3.orig/mm/memory_hotplug.c 2006-08-01 16:38:19.000000000 +0900
+++ linux-2.6.18-rc3/mm/memory_hotplug.c 2006-08-01 16:38:56.000000000 +0900
@@ -163,7 +163,7 @@
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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