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authorLiu Shixin <liushixin2@huawei.com>2022-09-23 11:33:40 +0800
committerAndrew Morton <akpm@linux-foundation.org>2022-11-08 17:37:15 -0800
commitf9e60beceee5c85dc9d5e71c1090cfed97ab0897 (patch)
tree311e69d500679a1bcbeacaf0b9b1e9c89ba9b950 /kernel/cgroup
parentf3ad032c2d06be970d78384885c63917974a4af4 (diff)
cgroup/cpuset: use hotplug_memory_notifier() directly
Patch series "mm: Use hotplug_memory_notifier() instead of register_hotmemory_notifier()", v4. Commit f02c69680088 ("include/linux/memory.h: implement register_hotmemory_notifier()") introduced register_hotmemory_notifier() to avoid a compile problem with gcc-4.4.4: When CONFIG_MEMORY_HOTPLUG=n, we don't want the memory-hotplug notifier handlers to be included in the .o files, for space reasons. The existing hotplug_memory_notifier() tries to handle this but testing with gcc-4.4.4 shows that it doesn't work - the hotplug functions are still present in the .o files. Since commit 76ae847497bc52 ("Documentation: raise minimum supported version of GCC to 5.1") has already updated the minimum gcc version to 5.1. The previous problem mentioned in f02c69680088 does not exist. So we can now revert to use hotplug_memory_notifier() directly rather than register_hotmemory_notifier(). In the last patch, we move all hotplug memory notifier priority to same file for easy sorting. This patch (of 8): Commit 76ae847497bc52 ("Documentation: raise minimum supported version of GCC to 5.1") updated the minimum gcc version to 5.1. So the problem mentioned in f02c69680088 ("include/linux/memory.h: implement register_hotmemory_notifier()") no longer exist. So we can now switch to use hotplug_memory_notifier() directly rather than register_hotmemory_notifier(). Link: https://lkml.kernel.org/r/20220923033347.3935160-1-liushixin2@huawei.com Link: https://lkml.kernel.org/r/20220923033347.3935160-2-liushixin2@huawei.com Signed-off-by: Liu Shixin <liushixin2@huawei.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Christoph Lameter <cl@linux.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Waiman Long <longman@redhat.com> Cc: zefan li <lizefan.x@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/cgroup')
-rw-r--r--kernel/cgroup/cpuset.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index b474289c15b8..0c6db6a4f427 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -3630,11 +3630,6 @@ static int cpuset_track_online_nodes(struct notifier_block *self,
return NOTIFY_OK;
}
-static struct notifier_block cpuset_track_online_nodes_nb = {
- .notifier_call = cpuset_track_online_nodes,
- .priority = 10, /* ??! */
-};
-
/**
* cpuset_init_smp - initialize cpus_allowed
*
@@ -3652,7 +3647,7 @@ void __init cpuset_init_smp(void)
cpumask_copy(top_cpuset.effective_cpus, cpu_active_mask);
top_cpuset.effective_mems = node_states[N_MEMORY];
- register_hotmemory_notifier(&cpuset_track_online_nodes_nb);
+ hotplug_memory_notifier(cpuset_track_online_nodes, 10);
cpuset_migrate_mm_wq = alloc_ordered_workqueue("cpuset_migrate_mm", 0);
BUG_ON(!cpuset_migrate_mm_wq);