Messages in this thread |  | | Date | Fri, 8 Dec 2017 11:54:19 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH] kthread: finer-grained lockdep/cross-release completion |
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On Thu, Dec 07, 2017 at 11:08:49AM +0100, Daniel Vetter wrote: > Since -rc1 we're hitting a bunch of lockdep splats using the new > cross-release stuff around the 2 kthread completions. In all cases > they are because totally independent uses of kthread are mixed up by > lockdep into the same locking class, creating artificial deadlocks. > > Fix this by converting kthread code in the same way as e.g. > alloc_workqueue already works: Use macros for the public api so we can > have a callsite specific lockdep key, then pass that through the > entire callchain. Due to the many entry points this is slightly > tedious. > > Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> > Cc: Marta Lofstedt <marta.lofstedt@intel.com> > Cc: Byungchul Park <byungchul.park@lge.com> > Cc: Ingo Molnar <mingo@kernel.org> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Tejun Heo <tj@kernel.org> > Cc: Kees Cook <keescook@chromium.org> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Shaohua Li <shli@fb.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Jens Axboe <axboe@kernel.dk> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Cc: Jonathan Corbet <corbet@lwn.net> > Cc: Oleg Nesterov <oleg@redhat.com> > References: https://bugs.freedesktop.org/show_bug.cgi?id=103950 > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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