add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/block/blk-cgroup.c
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@@ -1376,6 +1376,10 @@
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 		list_for_each_entry_reverse(blkg, &q->blkg_list, q_node)
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 			pol->pd_init_fn(blkg->pd[pol->plid]);
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+	if (pol->pd_online_fn)
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+		list_for_each_entry_reverse(blkg, &q->blkg_list, q_node)
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+			pol->pd_online_fn(blkg->pd[pol->plid]);
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+
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 	__set_bit(pol->plid, q->blkcg_pols);
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 	ret = 0;
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@@ -1790,6 +1794,7 @@
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 		current->use_memdelay = use_memdelay;
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 	set_notify_resume(current);
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 }
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+EXPORT_SYMBOL_GPL(blkcg_schedule_throttle);
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 /**
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  * blkcg_add_delay - add delay to this blkg