Hi David, 2012/06/27 15:16, David Rientjes wrote:
On Wed, 27 Jun 2012, Yasuaki Ishimatsu wrote:Index: linux-3.5-rc4/mm/memory_hotplug.c =================================================================== --- linux-3.5-rc4.orig/mm/memory_hotplug.c 2012-06-26 13:28:16.743211538 +0900 +++ linux-3.5-rc4/mm/memory_hotplug.c 2012-06-26 13:48:38.264940468 +0900 @@ -887,6 +887,11 @@ static int __ref offline_pages(unsigned lock_memory_hotplug(); + if (memory_is_offline(start_pfn, end_pfn)) { + ret = 0; + goto out; + } + zone = page_zone(pfn_to_page(start_pfn)); node = zone_to_nid(zone); nr_pages = end_pfn - start_pfn;Are there additional prerequisites for this patch? Otherwise it changes the return value of offline_memory() which will now call acpi_memory_powerdown_device() in the acpi memhotplug case when disabling. Is that a problem?
I have understood there is a person who expects "offline_pages()" to fail in this case by kosaki's comment. So I'll move memory_is_offline to caller side. Thanks, Yasuaki Ishimatsu
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