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Re: [PATCH] dma-fence: Move signalling tracepoint to before ops detach

by Christian König

On 4/9/26 15:58, Tvrtko Ursulin wrote: > > On 31/03/2026 08:49, Boris Brezillon wrote: >> On Mon, 30 Mar 2026 14:36:23 +0100 >> Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> wrote: >> >>> Move the signalling tracepoint to before fence->ops are reset otherwise >>> tracepoint will dereference a null pointer. >> >> I suspect other trace points are impacted too >> (trace_dma_fence_destroy() is, at the very least). > > Indeed. I wonder why that did not trigger for me, while the one I fix here was an insta-crash... You need to actually enable the trace points and at least for the destroy one nobody is usually interested in that. > > To fix trace_dma_fence_destroy I think we need a new tracepoint definition ie. move it away from the existing event class - make it just log the context and seqno. > > Anyone has a better idea? The idea of tracing without accessing fence->ops sounds valid to me. Alternatively we could call dma_fence_timeline_name() and dma_fence_driver_name() from the tracepoint as well, but that means the tracepoints now require a RCU read side lock. Regards, Christian. > > Regards, > > Tvrtko > >>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> >>> Fixes: 541c8f2468b9 ("dma-buf: detach fence ops on signal v3") >>> Cc: Christian König <christian.koenig(a)amd.com> >>> Cc: Philipp Stanner <phasta(a)kernel.org> >>> Cc: Boris Brezillon <boris.brezillon(a)collabora.com> >>> Cc: linux-media(a)vger.kernel.org >>> Cc: linaro-mm-sig(a)lists.linaro.org >>> --- >>> drivers/dma-buf/dma-fence.c | 3 ++- >>> 1 file changed, 2 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c >>> index 1826ba73094c..1c1eaecaf1b0 100644 >>> --- a/drivers/dma-buf/dma-fence.c >>> +++ b/drivers/dma-buf/dma-fence.c >>> @@ -363,6 +363,8 @@ void dma_fence_signal_timestamp_locked(struct dma_fence *fence, >>> &fence->flags))) >>> return; >>> + trace_dma_fence_signaled(fence); >>> + >>> /* >>> * When neither a release nor a wait operation is specified set the ops >>> * pointer to NULL to allow the fence structure to become independent >>> @@ -377,7 +379,6 @@ void dma_fence_signal_timestamp_locked(struct dma_fence *fence, >>> fence->timestamp = timestamp; >>> set_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags); >>> - trace_dma_fence_signaled(fence); >>> list_for_each_entry_safe(cur, tmp, &cb_list, node) { >>> INIT_LIST_HEAD(&cur->node); >> >

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Prepare to Rage Quit (and Maybe Love It): Diving into Level Devil

by graceful.earthworm.hsos＠hidingmail.com

So, you're looking for a new game to sink your teeth into? Something challenging, maybe a little bit infuriating, and definitely memorable? Look no further than Level Devil. This deceptively simple platformer is a masterclass in trickery, constantly changing the rules and keeping you on your toes. But don't be intimidated! With a little patience (and maybe a stress ball), you can conquer its devilish design. https://leveldevilfull.com Gameplay: Expect the Unexpected At its core, Level Devil is a 2D platformer. You control a little pixelated character tasked with reaching the exit door in each level. Sounds easy, right? Wrong. The beauty (and the frustration) lies in the unpredictable nature of the environment. Platforms crumble beneath your feet, spikes appear out of nowhere, and the ground itself can vanish unexpectedly. Each level introduces new challenges, forcing you to adapt your strategy on the fly. You'll encounter moving platforms, disappearing blocks, and even gravity-defying puzzles. The real kicker? The layout of the levels often changes on each attempt, meaning memorization alone won't cut it. You need to be quick-witted and reactive. The charm of Level Devil is its lack of hand-holding. There are no tutorials, no hints, and no mercy. You're thrown straight into the deep end, forced to learn from your mistakes (and trust me, there will be plenty). That feeling of finally overcoming a particularly difficult section is incredibly rewarding. It's a game that demands your full attention and rewards persistence. Tips for Taming the Devil While Level Devil thrives on its unpredictability, here are a few tips to help you navigate its treacherous landscape: • Patience is Key: This game is designed to test your limits. Don't get discouraged by frequent deaths. Treat each attempt as a learning experience. • Observe Carefully: Before making a move, take a moment to scan the environment. Look for subtle cues that might indicate impending danger. • Embrace Failure: You will die. A lot. Embrace it as part of the learning process. Each death provides valuable insight into the level's design. • Don't Overthink It: Sometimes, the solution is simpler than you think. Avoid overcomplicating your approach. • Take Breaks: If you find yourself getting too frustrated, step away from the game for a while. Come back with a fresh perspective. • Listen to the Sound: The game’s audio cues often hint at upcoming dangers. Pay close attention! Level Devil utilizes sound design to enhance the experience (and sometimes, to cleverly mislead you!). Conclusion: A Test of Skill and Sanity Level Devil isn't for the faint of heart. It's a challenging and often frustrating experience. However, it's also incredibly rewarding. The constant surprises, the need for quick thinking, and the sheer satisfaction of overcoming its devilish design make it a truly unique and memorable game. If you're looking for a platformer that will push you to your limits and leave you feeling accomplished, then Level Devil is definitely worth a try. Just be prepared to rage quit... and then come back for more.

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