[{"id":3681590,"web_url":"http://patchwork.ozlabs.org/comment/3681590/","msgid":"","list_archive_url":null,"date":"2026-04-23T17:38:58","subject":"Re: [Intel-wired-lan] [PATCH 6.6.y] i40e: Fix preempt count leak in\n napi poll tracepoint","submitter":{"id":9784,"url":"http://patchwork.ozlabs.org/api/people/9784/","name":"Jacob Keller","email":"jacob.e.keller@intel.com"},"content":"On 4/21/2026 12:18 AM, charles_xu@189.cn wrote:\n> From: Thomas Gleixner \n> \n> [ Upstream commit 4b3d54a85bd37ebf2d9836f0d0de775c0ff21af9 ]\n> \n> Using get_cpu() in the tracepoint assignment causes an obvious preempt\n> count 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> \n> This clearly has seen a lot of testing in the last 3+ years...\n> \n> Use smp_processor_id() instead.\n> \n> Fixes: 6d4d584a7ea8 (\"i40e: Add i40e_napi_poll tracepoint\")\n> Signed-off-by: Thomas Gleixner \n> Cc: Tony Nguyen \n> Cc: Przemek Kitszel \n> Cc: intel-wired-lan@lists.osuosl.org\n> Cc: netdev@vger.kernel.org\n> Reviewed-by: Joe Damato \n> Reviewed-by: Aleksandr Loktionov \n> Signed-off-by: Tony Nguyen \n> Signed-off-by: Charles Xu \n> ---\n\nThis was already backported 6.12, but wasn't in v6.6. The v6.6 tree does\nhave the i40e_napi_poll tracepoint, so it makes sense to backport this\nthere as well.\n\nAcked-by: Jacob Keller ","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=ojOOe8Q/;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::136; helo=smtp3.osuosl.org;\n envelope-from=intel-wired-lan-bounces@osuosl.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g1jyF6MB5z1y2d\n\tfor ; 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