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>
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@ -858,7 +858,7 @@ static int __init kernel_init(void * unused)
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/*
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/*
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* init can allocate pages on any node
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* init can allocate pages on any node
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*/
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*/
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set_mems_allowed(node_possible_map);
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set_mems_allowed(node_states[N_HIGH_MEMORY]);
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/*
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/*
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* init can run on any cpu.
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* init can run on any cpu.
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*/
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*/
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@ -920,9 +920,6 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
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* call to guarantee_online_mems(), as we know no one is changing
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* call to guarantee_online_mems(), as we know no one is changing
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* our task's cpuset.
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* our task's cpuset.
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*
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*
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* Hold callback_mutex around the two modifications of our tasks
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* mems_allowed to synchronize with cpuset_mems_allowed().
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*
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* While the mm_struct we are migrating is typically from some
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* While the mm_struct we are migrating is typically from some
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* other task, the task_struct mems_allowed that we are hacking
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* other task, the task_struct mems_allowed that we are hacking
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* is for our current task, which must allocate new pages for that
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* is for our current task, which must allocate new pages for that
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@ -1391,11 +1388,10 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont,
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if (cs == &top_cpuset) {
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if (cs == &top_cpuset) {
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cpumask_copy(cpus_attach, cpu_possible_mask);
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cpumask_copy(cpus_attach, cpu_possible_mask);
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to = node_possible_map;
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} else {
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} else {
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guarantee_online_cpus(cs, cpus_attach);
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guarantee_online_cpus(cs, cpus_attach);
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guarantee_online_mems(cs, &to);
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}
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}
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guarantee_online_mems(cs, &to);
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/* do per-task migration stuff possibly for each in the threadgroup */
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/* do per-task migration stuff possibly for each in the threadgroup */
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cpuset_attach_task(tsk, &to, cs);
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cpuset_attach_task(tsk, &to, cs);
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@ -2090,15 +2086,23 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
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static int cpuset_track_online_nodes(struct notifier_block *self,
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static int cpuset_track_online_nodes(struct notifier_block *self,
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unsigned long action, void *arg)
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unsigned long action, void *arg)
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{
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{
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nodemask_t oldmems;
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cgroup_lock();
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cgroup_lock();
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switch (action) {
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switch (action) {
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case MEM_ONLINE:
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case MEM_ONLINE:
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case MEM_OFFLINE:
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oldmems = top_cpuset.mems_allowed;
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mutex_lock(&callback_mutex);
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mutex_lock(&callback_mutex);
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top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
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top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
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mutex_unlock(&callback_mutex);
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mutex_unlock(&callback_mutex);
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if (action == MEM_OFFLINE)
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update_tasks_nodemask(&top_cpuset, &oldmems, NULL);
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scan_for_empty_cpusets(&top_cpuset);
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break;
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case MEM_OFFLINE:
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/*
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* needn't update top_cpuset.mems_allowed explicitly because
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* scan_for_empty_cpusets() will update it.
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*/
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scan_for_empty_cpusets(&top_cpuset);
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break;
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break;
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default:
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default:
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break;
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break;
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@ -219,7 +219,7 @@ int kthreadd(void *unused)
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set_task_comm(tsk, "kthreadd");
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set_task_comm(tsk, "kthreadd");
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ignore_signals(tsk);
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ignore_signals(tsk);
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set_cpus_allowed_ptr(tsk, cpu_all_mask);
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set_cpus_allowed_ptr(tsk, cpu_all_mask);
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set_mems_allowed(node_possible_map);
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set_mems_allowed(node_states[N_HIGH_MEMORY]);
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current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
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current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
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