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This prevented new nodes from being > recognized when memory hotplug events occurred, limiting the ability > to update or extend sysfs entries dynamically at runtime. > > To address this, this patch refactors the sysfs infrastructure and > encapsulates it within a new structure, `sysfs_wi_group`, which holds > both the kobject and an array of node attribute pointers. > > By allocating this group structure globally, the per-node sysfs > attributes can be managed beyond initialization time, enabling > external modules to insert or remove node entries in response to > events such as memory hotplug or node online/offline transitions. > > Instead of allocating all per-node sysfs attributes at once, the > initialization path now uses the existing sysfs_wi_node_add() and > sysfs_wi_node_delete() helpers. This refactoring makes it possible > to modularly manage per-node sysfs entries and ensures the > infrastructure is ready for runtime extension. > > Signed-off-by: Rakie Kim > Signed-off-by: Honggyu Kim > Signed-off-by: Yunjeong Mun > Reviewed-by: Gregory Price > --- > mm/mempolicy.c | 61 ++++++++++++++++++++++++-------------------------- > 1 file changed, 29 insertions(+), 32 deletions(-) > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 0da102aa1cfc..988575f29c53 100644 > --- a/mm/mempolicy.c > +++ b/mm/mempolicy.c > @@ -3419,6 +3419,13 @@ struct iw_node_attr { > int nid; > }; > > +struct sysfs_wi_group { > + struct kobject wi_kobj; > + struct iw_node_attr *nattrs[]; > +}; > + > +static struct sysfs_wi_group *wi_group; > + > static ssize_t node_show(struct kobject *kobj, struct kobj_attribute *attr, > char *buf) > { > @@ -3461,27 +3468,24 @@ static ssize_t node_store(struct kobject *kobj, struct kobj_attribute *attr, > return count; > } > > -static struct iw_node_attr **node_attrs; > - > -static void sysfs_wi_node_release(struct iw_node_attr *node_attr, > - struct kobject *parent) > +static void sysfs_wi_node_delete(int nid) > { > - if (!node_attr) > + if (!wi_group->nattrs[nid]) > return; > - sysfs_remove_file(parent, &node_attr->kobj_attr.attr); > - kfree(node_attr->kobj_attr.attr.name); > - kfree(node_attr); > + > + sysfs_remove_file(&wi_group->wi_kobj, > + &wi_group->nattrs[nid]->kobj_attr.attr); This still looks broken to me, but I think this is more a problem that was present in the original code. At this point @wi_group's reference count is zero because sysfs_wi_release() has been called. However, it can only be zero if it has properly transitioned through kobject_del() and final kobject_put(). It follows that kobject_del() arranges for kobj->sd to be NULL. That means that this *should* be hitting the WARN() in kernfs_remove_by_name_ns() for the !parent case. So, either you are not triggering that path, or testing that path, but sys_remove_file() of the child attributes should be happening *before* sysfs_wi_release(). Did I miss something?