From: Pablo Neira Ayuso pablo@netfilter.org
[ Upstream commit c2e756ff9e699865d294cdc112acfc36419cf5cc ]
Using smp_processor_id() causes splats with PREEMPT_RCU:
[19379.552780] BUG: using smp_processor_id() in preemptible [00000000] code: ping/32389 [19379.552793] caller is debug_smp_processor_id+0x17/0x19 [...] [19379.552823] Call Trace: [19379.552832] [<ffffffff81274e9e>] dump_stack+0x67/0x90 [19379.552837] [<ffffffff8129a4d4>] check_preemption_disabled+0xe5/0xf5 [19379.552842] [<ffffffff8129a4fb>] debug_smp_processor_id+0x17/0x19 [19379.552849] [<ffffffffa07c42dd>] nft_queue_eval+0x35/0x20c [nft_queue]
No need to disable preemption since we only fetch the numeric value, so let's use raw_smp_processor_id() instead.
Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin alexander.levin@verizon.com --- net/netfilter/nft_queue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/netfilter/nft_queue.c b/net/netfilter/nft_queue.c index e8ae2f6bf232..88cd49d3548e 100644 --- a/net/netfilter/nft_queue.c +++ b/net/netfilter/nft_queue.c @@ -37,7 +37,7 @@ static void nft_queue_eval(const struct nft_expr *expr,
if (priv->queues_total > 1) { if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) { - int cpu = smp_processor_id(); + int cpu = raw_smp_processor_id();
queue = priv->queuenum + cpu % priv->queues_total; } else {