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Date: Mon, 11 Dec 2017 10:19:28 +0100 From: Daniel Vetter <daniel@...ll.ch> To: Peter Zijlstra <peterz@...radead.org> Cc: Daniel Vetter <daniel.vetter@...ll.ch>, LKML <linux-kernel@...r.kernel.org>, DRI Development <dri-devel@...ts.freedesktop.org>, Intel Graphics Development <intel-gfx@...ts.freedesktop.org>, Tvrtko Ursulin <tvrtko.ursulin@...el.com>, Marta Lofstedt <marta.lofstedt@...el.com>, Byungchul Park <byungchul.park@....com>, Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>, Kees Cook <keescook@...omium.org>, Thomas Gleixner <tglx@...utronix.de>, Shaohua Li <shli@...com>, Andrew Morton <akpm@...ux-foundation.org>, Jens Axboe <axboe@...nel.dk>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jonathan Corbet <corbet@....net>, Oleg Nesterov <oleg@...hat.com>, Daniel Vetter <daniel.vetter@...el.com> Subject: Re: [PATCH] kthread: finer-grained lockdep/cross-release completion On Fri, Dec 08, 2017 at 11:54:19AM +0100, Peter Zijlstra wrote: > 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@...el.com> > > Cc: Marta Lofstedt <marta.lofstedt@...el.com> > > Cc: Byungchul Park <byungchul.park@....com> > > Cc: Ingo Molnar <mingo@...nel.org> > > Cc: Peter Zijlstra <peterz@...radead.org> > > Cc: Tejun Heo <tj@...nel.org> > > Cc: Kees Cook <keescook@...omium.org> > > Cc: Thomas Gleixner <tglx@...utronix.de> > > Cc: Shaohua Li <shli@...com> > > Cc: Andrew Morton <akpm@...ux-foundation.org> > > Cc: Jens Axboe <axboe@...nel.dk> > > Cc: Daniel Vetter <daniel.vetter@...ll.ch> > > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> > > Cc: Jonathan Corbet <corbet@....net> > > Cc: Oleg Nesterov <oleg@...hat.com> > > References: https://bugs.freedesktop.org/show_bug.cgi?id=103950 > > Signed-off-by: Daniel Vetter <daniel.vetter@...el.com> > > Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org> Who's going to pick this up? Ingo, Andrew? Thanks, Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
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