{"id":2226629,"url":"http://patchwork.ozlabs.org/api/patches/2226629/?format=json","web_url":"http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260421071838.3878-1-charles_xu@189.cn/","project":{"id":46,"url":"http://patchwork.ozlabs.org/api/projects/46/?format=json","name":"Intel Wired Ethernet development","link_name":"intel-wired-lan","list_id":"intel-wired-lan.osuosl.org","list_email":"intel-wired-lan@osuosl.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260421071838.3878-1-charles_xu@189.cn>","list_archive_url":null,"date":"2026-04-21T07:18:38","name":"[6.6.y] i40e: Fix preempt count leak in napi poll tracepoint","commit_ref":null,"pull_url":null,"state":"handled-elsewhere","archived":false,"hash":"133a95ee31db351a25f110a004d524448c9cb247","submitter":{"id":93226,"url":"http://patchwork.ozlabs.org/api/people/93226/?format=json","name":"Charles Xu","email":"charles_xu@189.cn"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260421071838.3878-1-charles_xu@189.cn/mbox/","series":[{"id":501047,"url":"http://patchwork.ozlabs.org/api/series/501047/?format=json","web_url":"http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=501047","date":"2026-04-21T07:18:38","name":"[6.6.y] i40e: Fix preempt count leak in napi poll tracepoint","version":1,"mbox":"http://patchwork.ozlabs.org/series/501047/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226629/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226629/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=KPw5bZf2;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::136; 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client-ip=125.88.204.37;\n helo=mail.189.cn; envelope-from=charles_xu@189.cn; receiver=","HMM_SOURCE_IP":"10.158.242.145:0.1498820815","HMM_ATTACHE_NUM":"0000","HMM_SOURCE_TYPE":"SMTP","X-Transaction-ID":"460328a3dd2645d881ad4c010de65c55","X-Real-From":"charles_xu@189.cn","X-Receive-IP":"223.104.44.125","X-MEDUSA-Status":"0","From":"charles_xu@189.cn","To":"tglx@kernel.org, anthony.l.nguyen@intel.com, przemyslaw.kitszel@intel.com,\n intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, joe@dama.to,\n aleksandr.loktionov@intel.com, stable@vger.kernel.org","Date":"Tue, 21 Apr 2026 15:18:38 +0800","Message-Id":"<20260421071838.3878-1-charles_xu@189.cn>","X-Mailer":"git-send-email 2.35.3","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Mailman-Approved-At":"Wed, 22 Apr 2026 17:02:16 +0000","X-Mailman-Original-Authentication-Results":"smtp1.osuosl.org;\n dmarc=none (p=none dis=none)\n header.from=189.cn","Subject":"[Intel-wired-lan] [PATCH 6.6.y] i40e: Fix preempt count leak in\n napi poll tracepoint","X-BeenThere":"intel-wired-lan@osuosl.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Intel Wired Ethernet Linux Kernel Driver Development\n ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"intel-wired-lan-bounces@osuosl.org","Sender":"\"Intel-wired-lan\" "},"content":"From: Thomas Gleixner \n\n[ Upstream commit 4b3d54a85bd37ebf2d9836f0d0de775c0ff21af9 ]\n\nUsing get_cpu() in the tracepoint assignment causes an obvious preempt\ncount leak because nothing invokes put_cpu() to undo it:\n\n softirq: huh, entered softirq 3 NET_RX with preempt_count 00000100, exited with 00000101?\n\nThis clearly has seen a lot of testing in the last 3+ years...\n\nUse smp_processor_id() instead.\n\nFixes: 6d4d584a7ea8 (\"i40e: Add i40e_napi_poll tracepoint\")\nSigned-off-by: Thomas Gleixner \nCc: Tony Nguyen \nCc: Przemek Kitszel \nCc: intel-wired-lan@lists.osuosl.org\nCc: netdev@vger.kernel.org\nReviewed-by: Joe Damato \nReviewed-by: Aleksandr Loktionov \nSigned-off-by: Tony Nguyen \nSigned-off-by: Charles Xu \n---\n drivers/net/ethernet/intel/i40e/i40e_trace.h | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)","diff":"diff --git a/drivers/net/ethernet/intel/i40e/i40e_trace.h b/drivers/net/ethernet/intel/i40e/i40e_trace.h\nindex 33b4e30f5e00..9b735a9e2114 100644\n--- a/drivers/net/ethernet/intel/i40e/i40e_trace.h\n+++ b/drivers/net/ethernet/intel/i40e/i40e_trace.h\n@@ -88,7 +88,7 @@ TRACE_EVENT(i40e_napi_poll,\n \t\t__entry->rx_clean_complete = rx_clean_complete;\n \t\t__entry->tx_clean_complete = tx_clean_complete;\n \t\t__entry->irq_num = q->irq_num;\n-\t\t__entry->curr_cpu = get_cpu();\n+\t\t__entry->curr_cpu = smp_processor_id();\n \t\t__assign_str(qname, q->name);\n \t\t__assign_str(dev_name, napi->dev ? napi->dev->name : NO_DEV);\n \t\t__assign_bitmask(irq_affinity, cpumask_bits(&q->affinity_mask),\n","prefixes":["6.6.y"]}