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 <[email protected]> > Cc: Marta Lofstedt <[email protected]> > Cc: Byungchul Park <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Tejun Heo <[email protected]> > Cc: Kees Cook <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: Shaohua Li <[email protected]> > Cc: Andrew Morton <[email protected]> > Cc: Jens Axboe <[email protected]> > Cc: Daniel Vetter <[email protected]> > Cc: Greg Kroah-Hartman <[email protected]> > Cc: Jonathan Corbet <[email protected]> > Cc: Oleg Nesterov <[email protected]> > References: https://bugs.freedesktop.org/show_bug.cgi?id=103950 > Signed-off-by: Daniel Vetter <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
