From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 254DDC31E5B for ; Wed, 19 Jun 2019 17:43:23 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F22F02147A for ; Wed, 19 Jun 2019 17:43:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="P1CCmS34"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="jjvjrf5e" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F22F02147A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=y8ikfQO94n3bsaAswX+Etw0/eBNzID98aWWchm70IJc=; b=P1CCmS34muGfcfHYaYtMIr0yXR Ti3UzTdrJ4v//MnjsJEhx/+VgNvkNSM7D/DFLRqfbvTV7EmhqOShGMEw2PtiTn0SpQwTE4OA9QpNI XjRz4zILlwEVdenu55yEA7ryTvE1O6KuuwRQu0OiVzLRLFxMPaJSGjRF9xEGIXySbQdHVyhWnGuW0 duEr5RRcPgCpw3OKWsByITEpmFjhIXUHBN06GtVGkt9+ibFoeVhGuYW9OPrZwomIgIMoxgJGngPoV qgo+KTTsUgpNAdXIQdjf8+Zjg+rDm0uypbSJ3xcOC4gp74W3inJ7VWQBZPie6shebuwEcr+rF2Aiz bcNaYYIQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hdecA-0006qd-Qr; Wed, 19 Jun 2019 17:43:18 +0000 Received: from mail-pf1-x444.google.com ([2607:f8b0:4864:20::444]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hdePi-0000BJ-JV for linux-arm-kernel@lists.infradead.org; Wed, 19 Jun 2019 17:30:37 +0000 Received: by mail-pf1-x444.google.com with SMTP id 19so9519pfa.4 for ; Wed, 19 Jun 2019 10:30:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=U+080fyAUiTJTh9JJ5MaKbNtEVXayYcNMjeizWilaNg=; b=jjvjrf5em+qq0b3ji52nC5vHMkInyqu5hnwQOPG9S17R16YxILUdkig5Ydtuz4YcjF h77FBhj2WPPXa896Kk0/m45lBfpne0f3MsAQDLJu/cH0IuIOeJk3PcFkt/2gK7aK5lYJ 6B9t5vgr/LanC4CixUjQQKLKbTZ6nOQ0lPruTduia7vxl1RQZSz1H5ynxzHMsnIcTXIQ afnQthfdkSB97VO8N3bGxfwLrq/HRCpLPAPpKZEEX1aEYLjl7EezhQegk7nMAIuEip6u 3exs80H5637eNy/Myd0/T5L/60/dF9P3KUhxI/sb8DfnE+s8md/cMQCfC7aKieSyCLGB pP+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=U+080fyAUiTJTh9JJ5MaKbNtEVXayYcNMjeizWilaNg=; b=CThPfm0xWFQ9sopsjErUWvg5MdYh/NuwPRRZ73pNhfE0FhZUlG8/lB6p2dJo5XYuWI r0ymbEsAV28CiPjxS2HgL/GVPpF2AwLwEs79IbTA3222xnhUf+inmRz3qqH8pMePWllr KrU6wlm15cW8g5n7I64tbcutVBC3uk7kVvfpwM/L7XiXG/ToApqy7bZDjUNTViPM9jt0 ixsVt5cPHlVe8H26ZQ/F1xJ3nooELnW3uRx2o8ZgOxVhlqaMm7L257cfv4jE6dqw6PL0 vGe2mvk7KCbvierNY329nfttxhJ6P8LF4fsRKkwv2Ta0gL+J3wobTGMtMXE10K+g5enw ORZA== X-Gm-Message-State: APjAAAWfT2B1R4JiaVMHBl6N0qbMgDvaOM/ZtX2vNRUq2/LDBxO4xiHN oW7z64JTh3Zdtlnkt6xL8kkBS9Z4gVKmxA== X-Google-Smtp-Source: APXvYqzVPrjgLGfAVwOVdWEtbQqYpnhq6yQqdbRbo28+kOI9c6oMo5bIBR/9f+691D20t7YLyzt+yQ== X-Received: by 2002:aa7:97bb:: with SMTP id d27mr59024903pfq.93.1560965425897; Wed, 19 Jun 2019 10:30:25 -0700 (PDT) Received: from xps15.cg.shawcable.net (S0106002369de4dac.cg.shawcable.net. [68.147.8.254]) by smtp.gmail.com with ESMTPSA id g2sm31348406pfb.95.2019.06.19.10.30.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Jun 2019 10:30:25 -0700 (PDT) From: Mathieu Poirier To: gregkh@linuxfoundation.org Subject: [PATCH 37/45] coresight: tmc-etr: Do not call smp_processor_id() from preemptible Date: Wed, 19 Jun 2019 11:29:41 -0600 Message-Id: <20190619172949.4522-38-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190619172949.4522-1-mathieu.poirier@linaro.org> References: <20190619172949.4522-1-mathieu.poirier@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190619_103026_736955_06515881 X-CRM114-Status: GOOD ( 14.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Suzuki K Poulose During a perf session we try to allocate buffers on the "node" associated with the CPU the event is bound to. If it's not bound to a CPU, we use the current CPU node, using smp_processor_id(). However this is unsafe in a pre-emptible context and could generate the splats as below : BUG: using smp_processor_id() in preemptible [00000000] code: perf/1743 caller is alloc_etr_buf.isra.6+0x80/0xa0 CPU: 1 PID: 1743 Comm: perf Not tainted 5.1.0-rc6-147786-g116841e #344 Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb 1 2019 Call trace: dump_backtrace+0x0/0x150 show_stack+0x14/0x20 dump_stack+0x9c/0xc4 debug_smp_processor_id+0x10c/0x110 alloc_etr_buf.isra.6+0x80/0xa0 tmc_alloc_etr_buffer+0x12c/0x1f0 etm_setup_aux+0x1c4/0x230 rb_alloc_aux+0x1b8/0x2b8 perf_mmap+0x35c/0x478 mmap_region+0x34c/0x4f0 do_mmap+0x2d8/0x418 vm_mmap_pgoff+0xd0/0xf8 ksys_mmap_pgoff+0x88/0xf8 __arm64_sys_mmap+0x28/0x38 el0_svc_handler+0xd8/0x138 el0_svc+0x8/0xc Use NUMA_NO_NODE hint instead of using the current node for events not bound to CPUs. Fixes: 855ab61c16bf70b646 ("coresight: tmc-etr: Refactor function tmc_etr_setup_perf_buf()") Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index ce0114a5435c..7c81f634ecb4 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1323,13 +1323,11 @@ static struct etr_perf_buffer * tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event, int nr_pages, void **pages, bool snapshot) { - int node, cpu = event->cpu; + int node; struct etr_buf *etr_buf; struct etr_perf_buffer *etr_perf; - if (cpu == -1) - cpu = smp_processor_id(); - node = cpu_to_node(cpu); + node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu); etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node); if (!etr_perf) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel