From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756551AbdKOCs0 (ORCPT ); Tue, 14 Nov 2017 21:48:26 -0500 Received: from omzsmtpe01.verizonbusiness.com ([199.249.25.210]:7379 "EHLO omzsmtpe01.verizonbusiness.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755122AbdKOCqv (ORCPT ); Tue, 14 Nov 2017 21:46:51 -0500 From: alexander.levin@verizon.com Cc: Pablo Neira Ayuso , alexander.levin@verizon.com X-Host: endeavour.tdc.vzwcorp.com To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: [PATCH AUTOSEL for 4.9 45/56] netfilter: nft_queue: use raw_smp_processor_id() Thread-Topic: [PATCH AUTOSEL for 4.9 45/56] netfilter: nft_queue: use raw_smp_processor_id() Thread-Index: AQHTXbvWeIyGsr9KGEuJMoPS6ZSBEw== Date: Wed, 15 Nov 2017 02:45:45 +0000 Message-ID: <20171115024521.5884-45-alexander.levin@verizon.com> References: <20171115024521.5884-1-alexander.levin@verizon.com> In-Reply-To: <20171115024521.5884-1-alexander.levin@verizon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id vAF2mT6F029185 From: Pablo Neira Ayuso [ 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] [] dump_stack+0x67/0x90 [19379.552837] [] check_preemption_disabled+0xe5/0xf5 [19379.552842] [] debug_smp_processor_id+0x17/0x19 [19379.552849] [] 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 Signed-off-by: Sasha Levin --- 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 393d359a1889..ef4768a451f4 100644 --- a/net/netfilter/nft_queue.c +++ b/net/netfilter/nft_queue.c @@ -38,7 +38,7 @@ 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 { -- 2.11.0