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Fri, 20 Jul 2018 08:39:26 +0000 From: Peter Rosin To: linux-kernel@vger.kernel.org Cc: Peter Rosin , Wolfram Sang , Peter Zijlstra , Ingo Molnar , Will Deacon , Davidlohr Bueso , Philippe Ombredanne , Thomas Gleixner , Greg Kroah-Hartman , linux-i2c@vger.kernel.org, Peter Chang , Deepa Dinamani , John Sperbeck Subject: [PATCH v4 0/2] Fix lockdep warning with nested instances of i2c-mux Date: Fri, 20 Jul 2018 10:39:12 +0200 Message-Id: <20180720083914.1950-1-peda@axentia.se> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [85.226.244.23] X-ClientProxiedBy: HE1PR0402CA0010.eurprd04.prod.outlook.com (2603:10a6:3:d0::20) To HE1PR0201MB2459.eurprd02.prod.outlook.com (2603:10a6:3:82::7) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 754345e5-76b8-451f-4090-08d5ee1c4d92 X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652040)(7021125)(8989117)(5600053)(711020)(4534165)(7022125)(4603075)(4627221)(201702281549075)(8990107)(7048125)(7024125)(7027125)(7028125)(7023125)(2017052603328)(7153060)(7193020);SRVR:HE1PR0201MB2459; 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Ping. This is almost a resend of v3, but I added tested-by tags from John and unwrapped a line in the commit message, so it's a v4. How is this going to find its way to Linus? I can move this through the i2c-mux tree, but I obviously need a tag for patch 1/2 for that... Cheers, Peter Changes since v3 https://lkml.org/lkml/2018/5/24/994 - Added Tested-by tags from John. - Unwrapped commit message for patch 2/2. Changes since v2 https://lkml.org/lkml/2018/5/24/176 - EXPORT_SYMBOL_GPL(rt_mutex_lock_nested) is more appropriate (the rt_ prefix was missing). Changes since v1 https://lkml.org/lkml/2018/5/24/93 - Further compile tests indicated a missing #define for rt_mutex_lock with lockdep enabled, so that one is added. - I have verified that I don't get any lockdep splat for a local i2c-mux setup with these patches applied, and that I do without them. Cheers, Peter Peter Rosin (2): rtmutex: allow specifying a subclass for nested locking i2c: mux: annotate the nested rt_mutex usage drivers/i2c/i2c-core-base.c | 2 +- drivers/i2c/i2c-mux.c | 4 ++-- include/linux/rtmutex.h | 7 +++++++ kernel/locking/rtmutex.c | 29 +++++++++++++++++++++++++---- 4 files changed, 35 insertions(+), 7 deletions(-) -- 2.11.0