Received: by 2002:a25:e74b:0:0:0:0:0 with SMTP id e72csp1878136ybh; Fri, 17 Jul 2020 03:46:35 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwn/w+xMJH9CZHfk5m85pNWCuDG/ChTXwQeuRpadODxTxzaf388yHoBKOaXctIc/2t4tBSG X-Received: by 2002:a17:906:2bc7:: with SMTP id n7mr8185795ejg.96.1594982795383; Fri, 17 Jul 2020 03:46:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1594982795; cv=none; d=google.com; s=arc-20160816; b=BLd03Gu/vjyx65qDmnW3dC6y6Y6EIwZkqP2ESjSd+gswphCrzXtKsHUi5PcKyRJBSw RMjJwTed1yeDBX799u3VIYonmleQJ7nEUyq5RxaYWy6Qav5xYQ+VpcQTPBPoqUl9Roz0 Vtdq337DeTxiGyqjfb/8tnTy/4kKPEMA6q7zxujd0kUbWEqBtSLYDImurig+Sbx79yGB s7TL0j/JCpZAlhHxjKmYBCbVKDi18sogGQ7REcaiQKFgjzBsmORiuxB5iIWkZ6SN//jg vlMj04CtRePJ5DCXHZfYxz8or3BU969CYUy5kFGWvVnC8gvCMaNc0DOHMvy0skn2Vwmb wJdQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=/rUf73vyH1U9Dgj8+9Vz30PcevTmeJO8e7aZDC5vDXk=; b=DFI74dpCUPmdIgLQ5f1VrMjztsBMD5g7QeAX6rym5AQ9+x3zfZLCQ6+gLD1TAaYt2U Q8iRoQFwCvDPZkynkTOur0kyxzr1+9cD8XYe6Xmw+9eOk7g0bv+YRBzOUb/2RvmvBID9 O8LH9QA//S+UWljgPwj6fvXvvUK8uOepKEMJAnCU6Q+fYwC9gGApMVcDGb9IJBKdiOId FXxkzKxkfWWUZ39q//gGusNXr5Mb4n7AT2/vapq+rQkSM7eI5itmepi5lCuN2ef35bzw i8FDcNurZQOqgjQGo6lObovUGgJxTuBah7ucNIv3ueR/cSae8ynKBGwZcshvl+P2NTMC S6Ig== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=dusBU3PF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id cx20si4540060edb.568.2020.07.17.03.46.12; Fri, 17 Jul 2020 03:46:35 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=dusBU3PF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726316AbgGQKnw (ORCPT + 99 others); Fri, 17 Jul 2020 06:43:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:50858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726059AbgGQKnw (ORCPT ); Fri, 17 Jul 2020 06:43:52 -0400 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1D88B20734; Fri, 17 Jul 2020 10:43:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594982631; bh=6I6JgYqOPYPJIJgJ4C1GUEIrc1Hr08T5r1A4SKQv1rk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dusBU3PFc8tVsUE0EUeaym/bI6vipNHJj51TVdSCmHJIkN0VI0CXXwZWESOFK9CIN b6GjSO5c6l8K5KDc1RjZvrwd//TrVZgjzH4P+ieQXONdX2ft83pROpzcSm9rHhx54f QBXuydbo9fNM0lCjKDRa76at+CDtS7QIaArjBuqo= From: Will Deacon To: mark.rutland@arm.com, Qi Liu , zhangshaokun@hisilicon.com, john.garry@huawei.com Cc: catalin.marinas@arm.com, kernel-team@android.com, Will Deacon , linux-kernel@vger.kernel.org, linuxarm@huawei.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] drivers/perf: Prevent forced unbinding of PMU drivers Date: Fri, 17 Jul 2020 11:43:42 +0100 Message-Id: <159497953657.530785.13608435502860855695.b4-ty@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <1594975763-32966-1-git-send-email-liuqi115@huawei.com> References: <1594975763-32966-1-git-send-email-liuqi115@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 17 Jul 2020 16:49:23 +0800, Qi Liu wrote: > Forcefully unbinding PMU drivers during perf sampling will lead to > a kernel panic, because the perf upper-layer framework call a NULL > pointer in this situation. > > To solve this issue, "suppress_bind_attrs" should be set to true, so > that bind/unbind can be disabled via sysfs and prevent unbinding PMU > drivers during perf sampling. Applied to arm64 (for-next/fixes), thanks! [1/1] drivers/perf: Prevent forced unbinding of PMU drivers https://git.kernel.org/arm64/c/f32ed8eb0e3f Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev