cpuset: fix the problem that cpuset_mem_spread_node() returns an offline node

cpuset_mem_spread_node() returns an offline node, and causes an oops.

This patch fixes it by initializing task->mems_allowed to
node_states[N_HIGH_MEMORY], and updating task->mems_allowed when doing
memory hotplug.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Reported-by: Nick Piggin <npiggin@suse.de>
Tested-by: Nick Piggin <npiggin@suse.de>
Cc: Paul Menage <menage@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/init/main.c b/init/main.c
index a1ab78ceb4b6..cbead27caefc 100644
--- a/init/main.c
+++ b/init/main.c
@@ -858,7 +858,7 @@ static int __init kernel_init(void * unused)
         /*
          * init can allocate pages on any node
          */
-        set_mems_allowed(node_possible_map);
+        set_mems_allowed(node_states[N_HIGH_MEMORY]);
         /*
          * init can run on any cpu.
          */