The patch titled
memory hotadd fixes: find_next_system_ram catch range fix
has been added to the -mm tree. Its filename is
memory-hotadd-fixes-find_next_system_ram-catch-range.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: memory hotadd fixes: find_next_system_ram catch range fix
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Cc: Keith Mannthey <kmannth@xxxxxxxxx>
Cc: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/resource.c | 3 ++-
mm/memory_hotplug.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff -puN kernel/resource.c~memory-hotadd-fixes-find_next_system_ram-catch-range kernel/resource.c
--- a/kernel/resource.c~memory-hotadd-fixes-find_next_system_ram-catch-range
+++ a/kernel/resource.c
@@ -244,6 +244,7 @@ int find_next_system_ram(struct resource
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
p = NULL;
break;
}
- if (p->start >= start)
+ if ((p->end >= start) && (p->start < end))
break;
}
read_unlock(&resource_lock);
diff -puN mm/memory_hotplug.c~memory-hotadd-fixes-find_next_system_ram-catch-range mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~memory-hotadd-fixes-find_next_system_ram-catch-range
+++ a/mm/memory_hotplug.c
@@ -163,7 +163,7 @@ int online_pages(unsigned long pfn, unsi
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);
_
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
memory-hotadd-fixes-not-aligned-memory-hotadd.patch
memory-hotadd-fixes-change-find_next_system_rams.patch
memory-hotadd-fixes-find_next_system_ram-catch-range.patch
memory-hotadd-fixes-avoid-check-in-acpi.patch
memory-hotadd-fixes-avoid-registering-res-twice.patch
namespaces-utsname-sysctl-hack.patch
reiser4-hardirq-include-fix.patch
-
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