On Wed, 2016-08-17 at 19:27 +0000, Sedat Dilek wrote: > > > > The call-trace is reproducible with my setup and seen on every > > > boot. Might have been nice to keep the backtrace when adding new people :) I found it here: https://lists.freedesktop.org/archives/intel-gfx/2016-July/100695.html > [ CC Peter, Johannes and Thorsten "The regression reporter" ] > > Peter has 2 fixes from Johannes in peterz/queue.git#locking/urgent > which fix the issue for me. > > [1/2] Revert "drm/fb-helper: Reduce READ_ONCE(master) to > lockless_dereference" > [2/2] locking/barriers: suppress sparse warnings in > lockless_dereference() I don't see how those could fix it. The second one is a pure compile- time issue, so it's completely irrelevant - it should not change code generation in any way. The first one, reverting to READ_ONCE(), does change the code a bit, but since lockless_dereference() has no lockdep involvement, I don't see how that could have any impact on a lockdep report. Judging from the lockdep report, you have a pretty simple ABBA deadlock there, but I really don't see how the changes could have any impact. johannes -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
