Linaro-mm-sig

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31 participants
6622 discussions

[PATCH v6] dma-buf: Fix silent overflow for phys vec to sgt

by David Hu

In case MMIO size is bigger than 4G and peer2peer DMA goes through host bridge, we trigger a code path that assigns the total linked IOVA (which is greater than 4G) to mapped_len. Previously, `mapped_len` was declared as 32-bit `unsigned int`. When accumulating `size_t` lengths, this leads to a silent wrap-around. This truncation causes truncated lengths to be passed to functions like `fill_sg_entry()`. Fix this by changing `mapped_len` to `size_t` (64-bit). While at it, fix similar potential overflow issues in `calc_sg_nents` by using `check_add_overflow()` for `nents` and using `unsigned int` for the loop iterator in `fill_sg_entry` to match. Fixes: 3aa31a8bb11e ("dma-buf: provide phys_vec to scatter-gather mapping routine") Cc: stable(a)vger.kernel.org Cc: iommu(a)lists.linux.dev Reviewed-by: Pranjal Shrivastava <praan(a)google.com> Reviewed-by: Kevin Tian <kevin.tian(a)intel.com> Signed-off-by: David Hu <xuehaohu(a)google.com> --- Changes in v6: - Used `check_add_overflow()` in `calc_sg_nents()` for safer accumulation (Leon). - Dropped explicit `!nents` check and added a comment noting that `sg_alloc_table` handles `nents == 0` (Leon). - Collected Reviewed-by from Kevin Tian. Changes in v5: - Removed WARN_ON_ONCE from calc_sg_nents() to avoid log noise (Jason). - Added explicit check for `!nents` in dma_buf_phys_vec_to_sgt() to cleanly return -EINVAL on overflow (Jason). Changes in v4: - Added WARN_ON_ONCE() to the nents overflow check to prevent silent failures (Claude Bot). Changes in v3: - Removed leftover sentence fragment from the commit message. - Kept `nents = 0` initialization (previously stated as removed in the v2 changelog) as it is strictly required for the `+=` accumulation loop in `calc_sg_nents()`. Changes in v2: - Fixed 'IVOA' -> 'IOVA' typo and expanded commit message (Claude Bot). - Added Reverse Xmas tree formatting (Pranjal). - Folded in extra bounds checking for calc_sg_nents() (Pranjal). - Folded in type consistency fix for fill_sg_entry() (Pranjal). - Collected Reviewed-by from Pranjal Shrivastava. drivers/dma-buf/dma-buf-mapping.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/dma-buf-mapping.c b/drivers/dma-buf/dma-buf-mapping.c index 794acff2546a..67a8ff52fb8f 100644 --- a/drivers/dma-buf/dma-buf-mapping.c +++ b/drivers/dma-buf/dma-buf-mapping.c @@ -5,12 +5,13 @@ */ #include <linux/dma-buf-mapping.h> #include <linux/dma-resv.h> +#include <linux/overflow.h> static struct scatterlist *fill_sg_entry(struct scatterlist *sgl, size_t length, dma_addr_t addr) { unsigned int len, nents; - int i; + unsigned int i; nents = DIV_ROUND_UP(length, UINT_MAX); for (i = 0; i < nents; i++) { @@ -40,8 +41,11 @@ static unsigned int calc_sg_nents(struct dma_iova_state *state, size_t i; if (!state || !dma_use_iova(state)) { - for (i = 0; i < nr_ranges; i++) - nents += DIV_ROUND_UP(phys_vec[i].len, UINT_MAX); + for (i = 0; i < nr_ranges; i++) { + unsigned int added = DIV_ROUND_UP(phys_vec[i].len, UINT_MAX); + if (check_add_overflow(nents, added, &nents)) + return 0; + } } else { /* * In IOVA case, there is only one SG entry which spans @@ -95,9 +99,10 @@ struct sg_table *dma_buf_phys_vec_to_sgt(struct dma_buf_attachment *attach, size_t nr_ranges, size_t size, enum dma_data_direction dir) { - unsigned int nents, mapped_len = 0; struct dma_buf_dma *dma; struct scatterlist *sgl; + size_t mapped_len = 0; + unsigned int nents; dma_addr_t addr; size_t i; int ret; @@ -133,6 +138,8 @@ struct sg_table *dma_buf_phys_vec_to_sgt(struct dma_buf_attachment *attach, } nents = calc_sg_nents(dma->state, phys_vec, nr_ranges, size); + + /* sg_alloc_table will cleanly fail and return -EINVAL if nents == 0 */ ret = sg_alloc_table(&dma->sgt, nents, GFP_KERNEL | __GFP_ZERO); if (ret) goto err_free_state; -- 2.54.0.1064.gd145956f57-goog

3 hours, 21 minutes

[PATCH v5] dma-buf: Fix silent overflow for phys vec to sgt

by David Hu

In case MMIO size is bigger than 4G and peer2peer DMA goes through host bridge, we trigger a code path that assigns the total linked IOVA (which is greater than 4G) to mapped_len. Previously, `mapped_len` was declared as 32-bit `unsigned int`. When accumulating `size_t` lengths, this leads to a silent wrap-around. This truncation causes truncated lengths to be passed to functions like `fill_sg_entry()`. Fix this by changing `mapped_len` to `size_t` (64-bit). While at it, fix similar potential overflow issues in `calc_sg_nents` by using `size_t` for `nents` and checking against `UINT_MAX` and using `unsigned int` for the loop iterator in `fill_sg_entry` to match. Fixes: 3aa31a8bb11e ("dma-buf: provide phys_vec to scatter-gather mapping routine") Cc: stable(a)vger.kernel.org Cc: iommu(a)lists.linux.dev Reviewed-by: Pranjal Shrivastava <praan(a)google.com> Signed-off-by: David Hu <xuehaohu(a)google.com> --- Changes in v5: - Removed WARN_ON_ONCE from calc_sg_nents() to avoid log noise (Jason). - Added explicit check for `!nents` in dma_buf_phys_vec_to_sgt() to cleanly return -EINVAL on overflow (Jason). Changes in v4: - Added WARN_ON_ONCE() to the nents overflow check to prevent silent failures (Claude Bot). Changes in v3: - Removed leftover sentence fragment from the commit message. - Kept `nents = 0` initialization (previously stated as removed in the v2 changelog) as it is strictly required for the `+=` accumulation loop in `calc_sg_nents()`. Changes in v2: - Fixed 'IVOA' -> 'IOVA' typo and expanded commit message (Claude Bot). - Added Reverse Xmas tree formatting (Pranjal). - Folded in extra bounds checking for calc_sg_nents() (Pranjal). - Folded in type consistency fix for fill_sg_entry() (Pranjal). drivers/dma-buf/dma-buf-mapping.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/dma-buf/dma-buf-mapping.c b/drivers/dma-buf/dma-buf-mapping.c index 794acff2546a..607b7998463d 100644 --- a/drivers/dma-buf/dma-buf-mapping.c +++ b/drivers/dma-buf/dma-buf-mapping.c @@ -10,7 +10,7 @@ static struct scatterlist *fill_sg_entry(struct scatterlist *sgl, size_t length, dma_addr_t addr) { unsigned int len, nents; - int i; + unsigned int i; nents = DIV_ROUND_UP(length, UINT_MAX); for (i = 0; i < nents; i++) { @@ -36,7 +36,7 @@ static unsigned int calc_sg_nents(struct dma_iova_state *state, struct phys_vec *phys_vec, size_t nr_ranges, size_t size) { - unsigned int nents = 0; + size_t nents = 0; size_t i; if (!state || !dma_use_iova(state)) { @@ -51,6 +51,9 @@ static unsigned int calc_sg_nents(struct dma_iova_state *state, nents = DIV_ROUND_UP(size, UINT_MAX); } + if (nents > UINT_MAX) + return 0; + return nents; } @@ -95,9 +98,10 @@ struct sg_table *dma_buf_phys_vec_to_sgt(struct dma_buf_attachment *attach, size_t nr_ranges, size_t size, enum dma_data_direction dir) { - unsigned int nents, mapped_len = 0; struct dma_buf_dma *dma; struct scatterlist *sgl; + size_t mapped_len = 0; + unsigned int nents; dma_addr_t addr; size_t i; int ret; @@ -133,6 +137,11 @@ struct sg_table *dma_buf_phys_vec_to_sgt(struct dma_buf_attachment *attach, } nents = calc_sg_nents(dma->state, phys_vec, nr_ranges, size); + if (!nents) { + ret = -EINVAL; + goto err_free_state; + } + ret = sg_alloc_table(&dma->sgt, nents, GFP_KERNEL | __GFP_ZERO); if (ret) goto err_free_state; -- 2.54.0.929.g9b7fa37559-goog

4 hours, 9 minutes

[PATCH v19 0/4] Rust bindings for gem shmem

by Lyude Paul

Most of this patch series has already been pushed upstream, this is just the second half of the patch series that has not been pushed yet + some additional changes which were required to implement changes requested by the mailing list. This patch series is originally from Asahi, previously posted by Daniel Almeida. The previous version of the patch series can be found here: https://patchwork.freedesktop.org/series/164580/ Branch with patches applied available here: https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem This patch series applies on top of drm-rust-next Patch-series wide changes since V15: * Fix some major rebasing errors I somehow didn't notice :( * Drop the dependency on LazyInit, use the trick that Alice suggested instead. * Fix dependency ordering so that Tyr can get the vmap stuff first without the other bits. Patch-series wide changes since V16: * Fix ordering one more time (SetOnce::reset() doesn't need to come before adding vmap functions) * Rebase against the latest DeviceContext changes from me that got pushed. Lyude Paul (4): rust: drm: gem: shmem: Add DmaResvGuard helper rust: drm: gem: shmem: Add vmap functions rust: faux: Allow retrieving a bound Device rust: drm: gem: Introduce shmem::Object::sg_table() rust/kernel/drm/gem/shmem.rs | 524 ++++++++++++++++++++++++++++++++++- rust/kernel/faux.rs | 16 +- 2 files changed, 524 insertions(+), 16 deletions(-) base-commit: fea3a2dd7d3fc1936211ced5f84420e610435730 -- 2.54.0

4 hours, 14 minutes

Re: [PATCH v18 1/4] rust: drm: gem: shmem: Add DmaResvGuard helper

by lyude＠redhat.com

I think I have just been defaulting to always for anything that seems like it should be unquestionably inlined - should I be defaulting to #[inline] instead? On Sun, 2026-06-07 at 13:22 +0100, Gary Guo wrote: > > +impl<'a, T: DriverObject, C: DeviceContext> DmaResvGuard<'a, T, C> > > { > > + #[inline(always)] > > Why `always` here? > > Best, > Gary

5 hours, 54 minutes

Re: [PATCH net-next 2/4] udmabuf: emit one sg entry per pinned folio

by Christian König

On 6/8/26 15:55, Bobby Eshleman wrote: > > On Sun, Jun 7, 2026 at 11:42 PM Christian König <christian.koenig(a)amd.com <mailto:christian.koenig@amd.com>> wrote: > > On 6/5/26 20:44, Bobby Eshleman wrote: > > On Fri, Jun 05, 2026 at 11:30:07AM +0200, Christian König wrote: > >> On 6/4/26 02:42, Bobby Eshleman wrote: > >>> From: Bobby Eshleman <bobbyeshleman(a)meta.com <mailto:bobbyeshleman@meta.com>> > >>> > >>> get_sg_table() emitted one PAGE_SIZE sg entry per page even when the > >>> underlying folio was larger. > >>> > >>> Instead, walk folios[] and emit one sg entry per folio. When folios > >>> represent large pages (as is for MFD_HUGETLB), each sg entry is a large > >>> page. Normal PAGE_SIZE sg tables are unchanged. > >>> > >>> Required by net/core/devmem to support rx-buf-size > PAGE_SIZE with > >>> udmabuf. > >> > >> That doesn't explain why this is required. > > > > Sure, can definitely add. Devmem currently requires dmabuf sg entries to > > be length and size aligned when it allocates niovs for NIC page pools. > > Though udmabuf is not violating any dmabuf contract by emitting > > PAGE_SIZE entries and the above restriction is probably more a > > shortfalling of devmem, by emitting a single entry per folio this patch > > allows udmabuf to be used by devmem for large pages. > > > >> > >> Please note that accessing the pages/folio of an sg-table returned by DMA-buf is illegal and strictly forbidden! > >> > >> Regards, > >> Christian. > > > > It seems both devmem and io_uring zcrx at least introspect through to > > the sg-table to build NIC page pools (not accessing the memory itself, > > however). Is there a better way? > > That's an absolute NO-GO! We need to stop that immediately. > > Touching the underlying struct page of an DMA-buf exported sg-table is strictly forbidden. > > We even have code to wrap the sg_table and hide the struct pages on debug builds to catch those issues, see function dma_buf_wrap_sg_table(). > > My last status is that the NIC page pools are build directly from the DMA addresses exposed by the sg_table. > > Was there any change I'm not aware of? > > Regards, > Christian. > > > Oh no change, your mental model is still current. > They just go through each sg and use sg_dma_address() on each. Ah, thanks! That was a near heart attack :D Yeah that is perfectly correct, question is do you then still really need this udmabuf change? I mean the DMA API usually merges together contiguous DMA addresses. Regards, Christian. > > Best, > Bobby > > > > > > Best, > > Bobby > > > >> > >>> Signed-off-by: Bobby Eshleman <bobbyeshleman(a)meta.com <mailto:bobbyeshleman@meta.com>> > >>> --- > >>> drivers/dma-buf/udmabuf.c | 47 ++++++++++++++++++++++++++++++++++++++++++----- > >>> 1 file changed, 42 insertions(+), 5 deletions(-) > >>> > >>> diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c > >>> index 94b8ecb892bb..f28dd3788ada 100644 > >>> --- a/drivers/dma-buf/udmabuf.c > >>> +++ b/drivers/dma-buf/udmabuf.c > >>> @@ -141,26 +141,63 @@ static void vunmap_udmabuf(struct dma_buf *buf, struct iosys_map *map) > >>> vm_unmap_ram(map->vaddr, ubuf->pagecount); > >>> } > >>> > >>> +/* Return the number of contiguous pages backed by the folio at @i. > >>> + * A udmabuf may map only part of a folio, or reference the same folio > >>> + * in multiple non-contiguous runs, so folio_nr_pages() can't be used. > >>> + */ > >>> +static pgoff_t udmabuf_folio_nr_pages(struct udmabuf *ubuf, pgoff_t i) > >>> +{ > >>> + struct folio *f = ubuf->folios[i]; > >>> + pgoff_t j; > >>> + > >>> + for (j = 1; i + j < ubuf->pagecount; j++) { > >>> + if (ubuf->folios[i + j] != f) > >>> + break; > >>> + /* Same folio, but not a sequential offset within it. */ > >>> + if (ubuf->offsets[i + j] != ubuf->offsets[i] + j * PAGE_SIZE) > >>> + break; > >>> + } > >>> + return j; > >>> +} > >>> + > >>> +/* Count the contiguous folio runs in @ubuf, one sg entry per run. */ > >>> +static unsigned int udmabuf_sg_nents(struct udmabuf *ubuf) > >>> +{ > >>> + unsigned int nents = 0; > >>> + pgoff_t i; > >>> + > >>> + for (i = 0; i < ubuf->pagecount; i += udmabuf_folio_nr_pages(ubuf, i)) > >>> + nents++; > >>> + return nents; > >>> +} > >>> + > >>> static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, > >>> enum dma_data_direction direction) > >>> { > >>> struct udmabuf *ubuf = buf->priv; > >>> - struct sg_table *sg; > >>> struct scatterlist *sgl; > >>> - unsigned int i = 0; > >>> + struct sg_table *sg; > >>> + pgoff_t i, run; > >>> + unsigned int nents; > >>> int ret; > >>> > >>> + nents = udmabuf_sg_nents(ubuf); > >>> + > >>> sg = kzalloc_obj(*sg); > >>> if (!sg) > >>> return ERR_PTR(-ENOMEM); > >>> > >>> - ret = sg_alloc_table(sg, ubuf->pagecount, GFP_KERNEL); > >>> + ret = sg_alloc_table(sg, nents, GFP_KERNEL); > >>> if (ret < 0) > >>> goto err_alloc; > >>> > >>> - for_each_sg(sg->sgl, sgl, ubuf->pagecount, i) > >>> - sg_set_folio(sgl, ubuf->folios[i], PAGE_SIZE, > >>> + sgl = sg->sgl; > >>> + for (i = 0; i < ubuf->pagecount; i += run) { > >>> + run = udmabuf_folio_nr_pages(ubuf, i); > >>> + sg_set_folio(sgl, ubuf->folios[i], run << PAGE_SHIFT, > >>> ubuf->offsets[i]); > >>> + sgl = sg_next(sgl); > >>> + } > >>> > >>> ret = dma_map_sgtable(dev, sg, direction, 0); > >>> if (ret < 0) > >>> > >>> -- > >>> 2.53.0-Meta > >>> > >> >

7 hours, 55 minutes

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Living a Thousand Lives: Exploring the Quirky World of BitLife

by vast.stoat.yach＠hidingmail.net

Have you ever wondered what your life would look like if you made entirely different choices? Life simulation games have always been a fascinating genre for gamers, but few capture the unpredictable, hilarious, and sometimes chaotic nature of existence quite like Bitlife. Instead of relying on heavy 3D graphics, it is a text-based simulator that focuses entirely on the ripple effects of your decisions. It’s perfect for casual gaming sessions, so let's dive into how to play and get the most out of this quirky experience. https://bitlifefree.io/ Gameplay: Growing Up, One Year at a Time The premise of the game is incredibly simple but highly addictive. You are born with a random set of basic stats—Happiness, Health, Smarts, and Looks—in a random country to random parents. From there, you control your character's life year by year simply by tapping the "Age" button. In your early years, your choices are understandably limited to things like interacting with your parents, going to the doctor, or playing with pets. But as you grow into a teenager and an adult, the world completely opens up. You can choose to study hard, drop out, date, travel the world, buy real estate, or even turn to a life of crime. Every year, the game throws random scenarios at you: a classmate might insult you, you might be offered a questionable substance at a party, or you might find a wallet on the street. How you react directly impacts your stats and future opportunities. You might even have to pass mini-games, like navigating a maze for your driving test or escaping from prison. The ultimate goal is simply to live your life until your character passes away, leaving behind a unique legacy and a tombstone summarizing your deeds. Tips for a Great Experience If you are just starting out, here are a few tips to make your virtual life more successful—or at least more entertaining: Keep an eye on your core stats: Your Health and Happiness are crucial. If they drop too low, your character might face early health issues. Go to the gym, meditate, go to the movies, or spend time with family to keep these bars in the green. Education pays off (usually): If you want a high-paying, stable career like a doctor, judge, or CEO, use the "Study harder" option every year during school. Read books at the library to passively boost your Smarts stat. Hunt for Ribbons: At the end of every life, you are awarded a ribbon based on how you lived (e.g., "Hero," "Scandalous," "Lazy," or "Rich"). Trying to collect all the different ribbons is a great way to give yourself specific goals. Don't be afraid of the absurd: The real charm of the game is in its wild unpredictability. Sometimes, making terrible choices, trying to become a famous actor, or buying a crazy exotic pet leads to the most memorable playthroughs. Don't always play it safe! Conclusion Ultimately, the beauty of this simulator lies in its endless replayability. Every time you hit the button to start a new life, it is a completely blank slate. You can be a saint in one lifetime and an absolute menace to society in the next. Whether you have five minutes to kill on a bus commute or an hour to craft a sprawling, multi-generational family dynasty, diving into Bitlife offers a fun, lighthearted escape into a world where you pull all the strings. Give it a try, and see exactly where your choices take you!

14 hours, 36 minutes

Re: [PATCH net-next 2/4] udmabuf: emit one sg entry per pinned folio

by Christian König

On 6/5/26 20:44, Bobby Eshleman wrote: > On Fri, Jun 05, 2026 at 11:30:07AM +0200, Christian König wrote: >> On 6/4/26 02:42, Bobby Eshleman wrote: >>> From: Bobby Eshleman <bobbyeshleman(a)meta.com> >>> >>> get_sg_table() emitted one PAGE_SIZE sg entry per page even when the >>> underlying folio was larger. >>> >>> Instead, walk folios[] and emit one sg entry per folio. When folios >>> represent large pages (as is for MFD_HUGETLB), each sg entry is a large >>> page. Normal PAGE_SIZE sg tables are unchanged. >>> >>> Required by net/core/devmem to support rx-buf-size > PAGE_SIZE with >>> udmabuf. >> >> That doesn't explain why this is required. > > Sure, can definitely add. Devmem currently requires dmabuf sg entries to > be length and size aligned when it allocates niovs for NIC page pools. > Though udmabuf is not violating any dmabuf contract by emitting > PAGE_SIZE entries and the above restriction is probably more a > shortfalling of devmem, by emitting a single entry per folio this patch > allows udmabuf to be used by devmem for large pages. > >> >> Please note that accessing the pages/folio of an sg-table returned by DMA-buf is illegal and strictly forbidden! >> >> Regards, >> Christian. > > It seems both devmem and io_uring zcrx at least introspect through to > the sg-table to build NIC page pools (not accessing the memory itself, > however). Is there a better way? That's an absolute NO-GO! We need to stop that immediately. Touching the underlying struct page of an DMA-buf exported sg-table is strictly forbidden. We even have code to wrap the sg_table and hide the struct pages on debug builds to catch those issues, see function dma_buf_wrap_sg_table(). My last status is that the NIC page pools are build directly from the DMA addresses exposed by the sg_table. Was there any change I'm not aware of? Regards, Christian. > > Best, > Bobby > >> >>> Signed-off-by: Bobby Eshleman <bobbyeshleman(a)meta.com> >>> --- >>> drivers/dma-buf/udmabuf.c | 47 ++++++++++++++++++++++++++++++++++++++++++----- >>> 1 file changed, 42 insertions(+), 5 deletions(-) >>> >>> diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c >>> index 94b8ecb892bb..f28dd3788ada 100644 >>> --- a/drivers/dma-buf/udmabuf.c >>> +++ b/drivers/dma-buf/udmabuf.c >>> @@ -141,26 +141,63 @@ static void vunmap_udmabuf(struct dma_buf *buf, struct iosys_map *map) >>> vm_unmap_ram(map->vaddr, ubuf->pagecount); >>> } >>> >>> +/* Return the number of contiguous pages backed by the folio at @i. >>> + * A udmabuf may map only part of a folio, or reference the same folio >>> + * in multiple non-contiguous runs, so folio_nr_pages() can't be used. >>> + */ >>> +static pgoff_t udmabuf_folio_nr_pages(struct udmabuf *ubuf, pgoff_t i) >>> +{ >>> + struct folio *f = ubuf->folios[i]; >>> + pgoff_t j; >>> + >>> + for (j = 1; i + j < ubuf->pagecount; j++) { >>> + if (ubuf->folios[i + j] != f) >>> + break; >>> + /* Same folio, but not a sequential offset within it. */ >>> + if (ubuf->offsets[i + j] != ubuf->offsets[i] + j * PAGE_SIZE) >>> + break; >>> + } >>> + return j; >>> +} >>> + >>> +/* Count the contiguous folio runs in @ubuf, one sg entry per run. */ >>> +static unsigned int udmabuf_sg_nents(struct udmabuf *ubuf) >>> +{ >>> + unsigned int nents = 0; >>> + pgoff_t i; >>> + >>> + for (i = 0; i < ubuf->pagecount; i += udmabuf_folio_nr_pages(ubuf, i)) >>> + nents++; >>> + return nents; >>> +} >>> + >>> static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, >>> enum dma_data_direction direction) >>> { >>> struct udmabuf *ubuf = buf->priv; >>> - struct sg_table *sg; >>> struct scatterlist *sgl; >>> - unsigned int i = 0; >>> + struct sg_table *sg; >>> + pgoff_t i, run; >>> + unsigned int nents; >>> int ret; >>> >>> + nents = udmabuf_sg_nents(ubuf); >>> + >>> sg = kzalloc_obj(*sg); >>> if (!sg) >>> return ERR_PTR(-ENOMEM); >>> >>> - ret = sg_alloc_table(sg, ubuf->pagecount, GFP_KERNEL); >>> + ret = sg_alloc_table(sg, nents, GFP_KERNEL); >>> if (ret < 0) >>> goto err_alloc; >>> >>> - for_each_sg(sg->sgl, sgl, ubuf->pagecount, i) >>> - sg_set_folio(sgl, ubuf->folios[i], PAGE_SIZE, >>> + sgl = sg->sgl; >>> + for (i = 0; i < ubuf->pagecount; i += run) { >>> + run = udmabuf_folio_nr_pages(ubuf, i); >>> + sg_set_folio(sgl, ubuf->folios[i], run << PAGE_SHIFT, >>> ubuf->offsets[i]); >>> + sgl = sg_next(sgl); >>> + } >>> >>> ret = dma_map_sgtable(dev, sg, direction, 0); >>> if (ret < 0) >>> >>> -- >>> 2.53.0-Meta >>> >>

16 hours, 22 minutes

Re: [PATCH v18 0/4] Rust bindings for gem shmem

by Miguel Ojeda

On Sun, Jun 7, 2026 at 2:17 PM Gary Guo <gary(a)garyguo.net> wrote: > > IMO we really shouldn't use Clippy to generate code. We spent too much effort in > fixing codegen issues that are only present when driven by clippy. > > We should just run a check phase with clippy to get the lints only, and then use > rustc to generate actual code. Yeah, given the trouble it is giving, I think that will probably be a better approach medium term. I don't love it, because the original idea was to avoid such an extra phase, but it is definitely better vs. random source code changes... We could also increase the symbol size-related variables (`KSYM_NAME_LEN`, `SZ` in `modpost`...) only for Clippy builds to a ludicrous value. The extra phase approach would avoid surprises more generally though, so I like it in that sense, and has the implicit advantage of avoiding someone using a Clippy kernel in production by mistake. Ok, I can take a look at that. For now, I will pick the other patch. Cheers, Miguel

1 day, 8 hours

Re: [PATCH v18 0/4] Rust bindings for gem shmem

by Miguel Ojeda

On Sun, Jun 7, 2026 at 4:08 AM Alexandre Courbot <acourbot(a)nvidia.com> wrote: > > This is fixed by [1]. Maybe we should merge that one patch separately > and before the rest? I seem to be seeing these long symbol problems more > often recently. > > [1] https://lore.kernel.org/all/20260605-nova-exports-v4-1-e948c287407c@nvidia.… I can take that one via `rust-next` unless someone shouts -- Ack's appreciated. Cheers, Miguel

1 day, 11 hours

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