From: minskey guo Date: Mon, 24 May 2010 21:32:41 +0000 (-0700) Subject: cpu/mem hotplug: enable CPUs online before local memory online X-Git-Tag: v2.6.35-rc1~360 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf23422b9d76215316855253da491d4c9f294372;p=pandora-kernel.git cpu/mem hotplug: enable CPUs online before local memory online Enable users to online CPUs even if the CPUs belongs to a numa node which doesn't have onlined local memory. The zonlists(pg_data_t.node_zonelists[]) of a numa node are created either in system boot/init period, or at the time of local memory online. For a numa node without onlined local memory, its zonelists are not initialized at present. As a result, any memory allocation operations executed by CPUs within this node will fail. In fact, an out-of-memory error is triggered when attempt to online CPUs before memory comes to online. This patch tries to create zonelists for such numa nodes, so that the memory allocation for this node can be fallback'ed to other nodes. [akpm@linux-foundation.org: remove unneeded export] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: minskey guo Cc: Minchan Kim Cc: Yasunori Goto Cc: Andi Kleen Cc: Christoph Lameter Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed