From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 20 Oct 2017 15:14:06 +0900 From: Byungchul Park To: Bart Van Assche Cc: "mingo@kernel.org" , "peterz@infradead.org" , "linux-kernel@vger.kernel.org" , "amir73il@gmail.com" , "linux-block@vger.kernel.org" , "hch@infradead.org" , "linux-xfs@vger.kernel.org" , "tglx@linutronix.de" , "linux-mm@kvack.org" , "oleg@redhat.com" , "darrick.wong@oracle.com" , "johannes.berg@intel.com" , "linux-fsdevel@vger.kernel.org" , "idryomov@gmail.com" , "tj@kernel.org" , "kernel-team@lge.com" , "david@fromorbit.com" Subject: Re: [RESEND PATCH 1/3] completion: Add support for initializing completion with lockdep_map Message-ID: <20171020061406.GF3310@X58A-UD3R> References: <1508319532-24655-1-git-send-email-byungchul.park@lge.com> <1508319532-24655-2-git-send-email-byungchul.park@lge.com> <1508455438.4542.4.camel@wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1508455438.4542.4.camel@wdc.com> Sender: owner-linux-mm@kvack.org List-ID: On Thu, Oct 19, 2017 at 11:24:00PM +0000, Bart Van Assche wrote: > Are there any completion objects for which the cross-release checking is > useful? Are there any wait_for_completion() callers that hold a mutex or > other locking object? Check /proc/lockdep, then you can find all dependencies wrt cross-lock. I named a lock class of wait_for_completion(), a sting starting with "(complete)". For example, in my machine: console_lock -> (complete)&req.done cpu_hotplug_lock.rw_sem -> (complete)&st->done_up cpuhp_state_mutex -> (complete)&st->done_up and so on. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org