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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2006-08-05 12:15:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-08-06 08:57:48 -0700 |
| commit | 58c1b5b079071d82b2f924000b7e8fb5585ce7d8 (patch) | |
| tree | 74178ceb6462b68cba9f1b144d450dafcaf01c22 | |
| parent | 0f04ab5efbca73ab366a156d96b073d2da35b158 (diff) | |
| download | linux-58c1b5b079071d82b2f924000b7e8fb5585ce7d8.tar.gz linux-58c1b5b079071d82b2f924000b7e8fb5585ce7d8.tar.bz2 linux-58c1b5b079071d82b2f924000b7e8fb5585ce7d8.zip | |
[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.c | 3 | ||||
| -rw-r--r-- | mm/memory_hotplug.c | 2 |
2 files changed, 3 insertions, 2 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 63e879379dbd..46286434af80 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 7d25cc12235f..26f1840879d6 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); |