add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/core/gro_cells.c
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@@ -26,7 +26,7 @@
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 	cell = this_cpu_ptr(gcells->cells);
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-	if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
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+	if (skb_queue_len(&cell->napi_skbs) > READ_ONCE(netdev_max_backlog)) {
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 drop:
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 		atomic_long_inc(&dev->rx_dropped);
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 		kfree_skb(skb);
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@@ -99,9 +99,14 @@
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 		struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
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 		napi_disable(&cell->napi);
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-		netif_napi_del(&cell->napi);
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+		__netif_napi_del(&cell->napi);
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 		__skb_queue_purge(&cell->napi_skbs);
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 	}
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+	/* This barrier is needed because netpoll could access dev->napi_list
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+	 * under rcu protection.
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+	 */
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+	synchronize_net();
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+
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 	free_percpu(gcells->cells);
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 	gcells->cells = NULL;
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 }