diff options
author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2006-06-27 09:53:36 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-28 00:32:36 (GMT) |
commit | 2842f11419704f8707fffc82e10d2263427fc130 (patch) | |
tree | 9bc86163ba7b2fa842b3aff2f087be6419f246bb /kernel/resource.c | |
parent | 0a54703904a4a206686b4e8c3f5a6927b60747aa (diff) | |
download | linux-2842f11419704f8707fffc82e10d2263427fc130.tar.xz |
[PATCH] catch valid mem range at onlining memory
This patch allows hot-add memory which is not aligned to section.
Now, hot-added memory has to be aligned to section size. Considering big
section sized archs, this is not useful.
When hot-added memory is registerd as iomem resoruce by iomem resource
patch, we can make use of that information to detect valid memory range.
Note: With this, not-aligned memory can be registerd. To allow hot-add
memory with holes, we have to do more work around add_memory().
(It doesn't allows add memory to already existing mem section.)
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/resource.c')
-rw-r--r-- | kernel/resource.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index e3080fc..2404f9b 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -232,6 +232,44 @@ int release_resource(struct resource *old) EXPORT_SYMBOL(release_resource); +#ifdef CONFIG_MEMORY_HOTPLUG +/* + * Finds the lowest memory reosurce exists within [res->start.res->end) + * the caller must specify res->start, res->end, res->flags. + * If found, returns 0, res is overwritten, if not found, returns -1. + */ +int find_next_system_ram(struct resource *res) +{ + resource_size_t start, end; + struct resource *p; + + BUG_ON(!res); + + start = res->start; + end = res->end; + + read_lock(&resource_lock); + for (p = iomem_resource.child; p ; p = p->sibling) { + /* system ram is just marked as IORESOURCE_MEM */ + if (p->flags != res->flags) + continue; + if (p->start > end) { + p = NULL; + break; + } + if (p->start >= start) + break; + } + read_unlock(&resource_lock); + if (!p) + return -1; + /* copy data */ + res->start = p->start; + res->end = p->end; + return 0; +} +#endif + /* * Find empty slot in the resource tree given range and alignment. */ |