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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id y25sm5594060ioa.5.2021.02.26.09.52.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 09:52:17 -0800 (PST) From: Shuah Khan To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org Subject: [PATCH v2 0/3] Add lockdep_assert_not_held() Date: Fri, 26 Feb 2021 10:52:12 -0700 Message-Id: X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210226_125222_132762_FC1FAD16 X-CRM114-Status: GOOD ( 14.46 ) X-BeenThere: ath10k@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, ath10k@lists.infradead.org, Shuah Khan Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath10k" Errors-To: ath10k-bounces+ath10k=archiver.kernel.org@lists.infradead.org Some kernel functions must not be called holding a specific lock. Doing so could lead to locking problems. Currently these routines call lock_is_held() to check for lock hold followed by WARN_ON. Adding a common lockdep interface will help reduce the duplication of this logic in the rest of the kernel. Add lockdep_assert_not_held() to be used in these functions to detect incorrect calls while holding a lock. lockdep_assert_not_held() provides the opposite functionality of lockdep_assert_held() which is used to assert calls that require holding a specific lock. The need for lockdep_assert_not_held() came up in a discussion on ath10k patch. ath10k_drain_tx() and i915_vma_pin_ww() are examples of functions that can use lockdep_assert_not_held(). Link: https://lore.kernel.org/lkml/37a29c383bff2fb1605241ee6c7c9be3784fb3c6.1613171185.git.skhan@linuxfoundation.org/ Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ This patch series adds lockdep_assert_not_held() and uses it in the second patch in ath10k_drain_tx() function. Patch 1 incorporates suggestions from Peter Zijlstra on v1 series to avoid misfires when lockdep_off() is employed. Patch 2 Johannes Berg's suggestions as it make it easier to read and maintain the lock states. These are defines and a enum to avoid changes to lock_is_held_type() and lockdep_is_held() return types. Patch 2 is a separate patch because it adds defines to lockdep.h and kernel/locking/lockdep.c now includes lockdep.h - decided make this a separate patch just in case issues related to header dependencies pop up. I can combine Patches 1&2 if that is preferred. Patch 3 uses the new interface in ath10k_drain_tx() function. Added Kalle Valo's Ack from v1 for this change. Tested on the mainline from yesterday. Shuah Khan (3): lockdep: add lockdep_assert_not_held() lockdep: add lockdep lock state defines ath10k: detect conf_mutex held ath10k_drain_tx() calls drivers/net/wireless/ath/ath10k/mac.c | 2 ++ include/linux/lockdep.h | 18 +++++++++++++++--- kernel/locking/lockdep.c | 6 +++++- 3 files changed, 22 insertions(+), 4 deletions(-) -- 2.27.0 _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k 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=-13.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 23C2FC433E0 for ; Fri, 26 Feb 2021 17:53:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5A7660241 for ; Fri, 26 Feb 2021 17:53:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230212AbhBZRxD (ORCPT ); Fri, 26 Feb 2021 12:53:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230042AbhBZRw7 (ORCPT ); Fri, 26 Feb 2021 12:52:59 -0500 Received: from mail-il1-x12a.google.com (mail-il1-x12a.google.com [IPv6:2607:f8b0:4864:20::12a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2BA2C06174A for ; Fri, 26 Feb 2021 09:52:18 -0800 (PST) Received: by mail-il1-x12a.google.com with SMTP id v8so5098360ilh.12 for ; Fri, 26 Feb 2021 09:52:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=dY88CmhEdqi8wt/ahIMuuDlu90hzE7DFVh5FsuKso0s=; b=GEozSIwSQMHght7BICfIen1ZuqO1Uu8LnD6oos4DAN9zjNzl+T9of+vQKxslcE2Bjl B+55kRiyHRj05v6DxQbsCcajyLUzb5WsFfKr2roMoSzknE6EsZ/a5Yc++mYmoMWZoxEj pCBOx2bG1l70JBbuNroc8ck/XWt9UWsOLppl0= 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:mime-version :content-transfer-encoding; bh=dY88CmhEdqi8wt/ahIMuuDlu90hzE7DFVh5FsuKso0s=; b=MuVmYLR+CyTaU+O8rFkU3ZdTrPa3oL4TWlPDTWY4npIeaWK09bZS4JOXwtw14Cj3Hz ZmQS1YhZiuqqMdwp0LN0S3bigij8m8TCbKn79mY3LjzUibHVOFjl47vbooNkdX5HkyAq F+Nw9mgpqW8BUsoY1AySWWTG3JUkCmG8CGh0UF11wexFrm5ySEDHCc0jDKtyucJ+xktc iyvtrcgZcYmsybUo3EwCV1XsGb8RMuQc6Ogz8wyuTKZxg6M7SDyj3JsKTEJv3rtg9Y60 IQ3J9v07jpEO7OAn9hUBQ81pmCl1M0BaxN8S7JidIFB9nLKl/1xOmtdVgs7KX6xOZSlJ MGdQ== X-Gm-Message-State: AOAM533cPjNYVntiUpoCCeU5/qMW6grZbYpaogOhMiHdvPHmZ5d/pv+9 /LICAlQi0B4AZ7ggtWaEcmq33g== X-Google-Smtp-Source: ABdhPJyk6Fd7CHK3TK6ZvIe6aA/9gQV5HhrgT8cwxOjO3hwk/x87J2J5g+K3jvzjCy1GS3+/u9qmFg== X-Received: by 2002:a05:6e02:881:: with SMTP id z1mr3371733ils.288.1614361938177; Fri, 26 Feb 2021 09:52:18 -0800 (PST) Received: from shuah-t480s.internal (c-24-9-64-241.hsd1.co.comcast.net. [24.9.64.241]) by smtp.gmail.com with ESMTPSA id y25sm5594060ioa.5.2021.02.26.09.52.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 09:52:17 -0800 (PST) From: Shuah Khan To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, kvalo@codeaurora.org, davem@davemloft.net, kuba@kernel.org Cc: Shuah Khan , ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/3] Add lockdep_assert_not_held() Date: Fri, 26 Feb 2021 10:52:12 -0700 Message-Id: X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Some kernel functions must not be called holding a specific lock. Doing so could lead to locking problems. Currently these routines call lock_is_held() to check for lock hold followed by WARN_ON. Adding a common lockdep interface will help reduce the duplication of this logic in the rest of the kernel. Add lockdep_assert_not_held() to be used in these functions to detect incorrect calls while holding a lock. lockdep_assert_not_held() provides the opposite functionality of lockdep_assert_held() which is used to assert calls that require holding a specific lock. The need for lockdep_assert_not_held() came up in a discussion on ath10k patch. ath10k_drain_tx() and i915_vma_pin_ww() are examples of functions that can use lockdep_assert_not_held(). Link: https://lore.kernel.org/lkml/37a29c383bff2fb1605241ee6c7c9be3784fb3c6.1613171185.git.skhan@linuxfoundation.org/ Link: https://lore.kernel.org/linux-wireless/871rdmu9z9.fsf@codeaurora.org/ This patch series adds lockdep_assert_not_held() and uses it in the second patch in ath10k_drain_tx() function. Patch 1 incorporates suggestions from Peter Zijlstra on v1 series to avoid misfires when lockdep_off() is employed. Patch 2 Johannes Berg's suggestions as it make it easier to read and maintain the lock states. These are defines and a enum to avoid changes to lock_is_held_type() and lockdep_is_held() return types. Patch 2 is a separate patch because it adds defines to lockdep.h and kernel/locking/lockdep.c now includes lockdep.h - decided make this a separate patch just in case issues related to header dependencies pop up. I can combine Patches 1&2 if that is preferred. Patch 3 uses the new interface in ath10k_drain_tx() function. Added Kalle Valo's Ack from v1 for this change. Tested on the mainline from yesterday. Shuah Khan (3): lockdep: add lockdep_assert_not_held() lockdep: add lockdep lock state defines ath10k: detect conf_mutex held ath10k_drain_tx() calls drivers/net/wireless/ath/ath10k/mac.c | 2 ++ include/linux/lockdep.h | 18 +++++++++++++++--- kernel/locking/lockdep.c | 6 +++++- 3 files changed, 22 insertions(+), 4 deletions(-) -- 2.27.0