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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.

51 minutes

[PATCH] dma-buf: Split sgl by largest page-aligned chunk

by David Hu

Currently, `fill_sg_entry()` splits the scatterlist using `UINT_MAX`. This creates a non-page-aligned DMA length (`0xFFFFFFFF`) for the first entry, resulting in non-page-aligned DMA addresses for all subsequent entries. While the underlying IOMMU mapping may be contiguous, hardware DMA engines often require explicit address alignment (e.g., page, cacheline, or storage sector boundaries). Passing unaligned addresses and lengths can cause explicit failures in DMA descriptor creation or silent data corruption if lower unaligned bits are truncated. Fix this by splitting the scatterlist by the largest possible page aligned chunk within `UINT_MAX` (`ALIGN_DOWN(UINT_MAX, PAGE_SIZE)`). This ensures all scatterlist DMA addresses and lengths remain page aligned and satisfy hardware constraints. Page-aligned entries allow the system to cleanly chunk payloads into PCIe MaxPayloadSize (MPS) (e.g., 128 bytes, 256 bytes, 512 bytes). As a result, this may help reduce TLP fragmentation in P2P transfers and alleviate potential congestion within a logical PCIe switch partition, especially when Relaxed Ordering is not possible due to hardware constraints. Reported-by: sashiko-bot <sashiko-bot(a)kernel.org> Closes: https://lore.kernel.org/all/20260609165431.778061F00893@smtp.kernel.org/ Fixes: 3aa31a8bb11e ("dma-buf: provide phys_vec to scatter-gather mapping routine") Cc: stable(a)vger.kernel.org Signed-off-by: David Hu <xuehaohu(a)google.com> --- drivers/dma-buf/dma-buf-mapping.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/dma-buf/dma-buf-mapping.c b/drivers/dma-buf/dma-buf-mapping.c index 794acff2546a..f2bde38fdb1f 100644 --- a/drivers/dma-buf/dma-buf-mapping.c +++ b/drivers/dma-buf/dma-buf-mapping.c @@ -5,6 +5,9 @@ */ #include <linux/dma-buf-mapping.h> #include <linux/dma-resv.h> +#include <linux/align.h> + +#define MAX_ENT_SZ ALIGN_DOWN(UINT_MAX, PAGE_SIZE) static struct scatterlist *fill_sg_entry(struct scatterlist *sgl, size_t length, dma_addr_t addr) @@ -12,9 +15,9 @@ static struct scatterlist *fill_sg_entry(struct scatterlist *sgl, size_t length, unsigned int len, nents; int i; - nents = DIV_ROUND_UP(length, UINT_MAX); + nents = DIV_ROUND_UP(length, MAX_ENT_SZ); for (i = 0; i < nents; i++) { - len = min_t(size_t, length, UINT_MAX); + len = min_t(size_t, length, MAX_ENT_SZ); length -= len; /* * DMABUF abuses scatterlist to create a scatterlist @@ -24,7 +27,7 @@ static struct scatterlist *fill_sg_entry(struct scatterlist *sgl, size_t length, * does not require the CPU list for mapping or unmapping. */ sg_set_page(sgl, NULL, 0, 0); - sg_dma_address(sgl) = addr + (dma_addr_t)i * UINT_MAX; + sg_dma_address(sgl) = addr + (dma_addr_t)i * MAX_ENT_SZ; sg_dma_len(sgl) = len; sgl = sg_next(sgl); } @@ -41,14 +44,14 @@ static unsigned int calc_sg_nents(struct dma_iova_state *state, if (!state || !dma_use_iova(state)) { for (i = 0; i < nr_ranges; i++) - nents += DIV_ROUND_UP(phys_vec[i].len, UINT_MAX); + nents += DIV_ROUND_UP(phys_vec[i].len, MAX_ENT_SZ); } else { /* * In IOVA case, there is only one SG entry which spans * for whole IOVA address space, but we need to make sure * that it fits sg->length, maybe we need more. */ - nents = DIV_ROUND_UP(size, UINT_MAX); + nents = DIV_ROUND_UP(size, MAX_ENT_SZ); } return nents; -- 2.55.0.rc0.738.g0c8ab3ebcc-goog

3 hours, 3 minutes

Re: [PATCH v4 02/10] PCI/P2PDMA: Add CONFIG_PCI_P2PDMA_CORE

by Matt Evans

Hi Logan, On 02/07/2026 16:45, Logan Gunthorpe wrote: > > > On 2026-07-01 11:12 a.m., Matt Evans wrote:> >> PCI POWER CONTROL >> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig >> index 33c88432b728..59d70bc84cc9 100644 >> --- a/drivers/pci/Kconfig >> +++ b/drivers/pci/Kconfig >> @@ -206,11 +206,7 @@ config PCIE_TPH >> config PCI_P2PDMA >> bool "PCI peer-to-peer transfer support" >> depends on ZONE_DEVICE >> - # >> - # The need for the scatterlist DMA bus address flag means PCI P2PDMA >> - # requires 64bit >> - # >> - depends on 64BIT >> + select PCI_P2PDMA_CORE > > Can we remove this dependency on 64BIT? Althogh it looks like > af2880ec440 complicated the issue a bit. > > If I remember correctly, the original reason for this is because on > 64bit systems dma_flags fit into unusued space in struct scatterlist and > on 32bit systems this space didn't exist and thus adding the flag > required increasing the size of the structure which wasn't desirable at > the time. > > But af2880ec440 introduced CONFIG_NEED_SG_DMA_FLAGS which doesn't depend > on 64bit which means if CONFIG_IOMMU_DMA and CONFIG_SWIOTLB are now set > on 32bit systems that structure will grow quite a bit. There was some discussion on this aspect of af2880ec440 in the corresponding v3 patch, for example: https://lore.kernel.org/all/feaefa41-9f67-4d4f-a3e0-282dca41f3eb@ozlabs.org/ It seems CONFIG_NEED_SG_DMA_FLAGS doesn't have a hard/functional dependency on 64BIT (and it can be enabled on some !64BIT configs already, despite what the stale comments say). > So maybe at this point it's fine to enable this on 32bit systems and we > can remove this requirement. However, I think we should do that > explicitly in its own patch, not hide it in this refactoring patch. Your question does prove it's too stealthy as-is. :) PCI_P2PDMA still can't be enabled on 32-bit systems because of its ZONE_DEVICE -> MEMORY_HOTPLUG -> 64BIT dependency. So we're not enabling 32-bit support for PCI_P2PDMA here, but it's not obvious and so I'll re-add the `depends on 64BIT`. At least then it won't be enabled without intention if someone enables ZONE_DEVICE on 32-bit systems... Thanks, Matt

14 hours, 30 minutes

Re: [PATCH] rust: device_id: rename IdTable::as_ptr to as_raw_id_table()

by Gary Guo

On Thu Jul 2, 2026 at 1:30 PM BST, Alice Ryhl wrote: > The current name of `as_ptr` is very generic, and if you attempt to > invoke `foo.as_ptr()` on a type for which this method is missing, then > an error along these lines will be printed: > > error[E0599]: no method named `as_ptr` found for reference `&DmaBuf` in the current scope > --> linux/rust/kernel/dma_buf/buf.rs:54:38 > | > 54 | ptr::eq(self.as_ptr(), other.as_ptr()) > | ^^^^^^ method not found in `&DmaBuf` > | > = help: items from traits can only be used if the trait is implemented and in scope > note: `device_id::IdTable` defines an item `as_ptr`, perhaps you need to implement it > --> linux/rust/kernel/device_id.rs:165:1 > | > 165 | pub trait IdTable<T: RawDeviceId, U> { > | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Suggesting the IdTable trait when an as_ptr() method is missing is not > useful. Renaming it to `as_raw_id_table` makes the method name unique to > this trait and avoids these bad suggestions. I think the name is fine. Functions of this sort is named `as_ptr()` and I don't see why it should differ just because it's on traits. I'd rather say this is a Rust deficiency. Perhaps there needs to be a improvement of `#[diagnostic::do_not_recommend]` so it can be sticked to methods or traits as well. Best, Gary > > Assisted-by: Antigravity:Gemini > Signed-off-by: Alice Ryhl <aliceryhl(a)google.com> > --- > rust/kernel/auxiliary.rs | 2 +- > rust/kernel/device_id.rs | 4 ++-- > rust/kernel/driver.rs | 8 +++++--- > rust/kernel/i2c.rs | 8 ++++---- > rust/kernel/pci.rs | 2 +- > rust/kernel/platform.rs | 4 ++-- > rust/kernel/usb.rs | 2 +- > 7 files changed, 16 insertions(+), 14 deletions(-)

17 hours, 26 minutes

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