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The API looks like: `mb(Ordering)`/`smp_mb(Ordering)`/`dma_mb(Ordering)`, where `Ordering` is one of `Full`, `Read`, `Write`. I retain the use of generics to avoid duplicating `CONFIG_SMP` check (but also retaining the ability to easily add `Acquire` and `Release` ordering in the future). A user of these introduced API is included in patch 3, which is a concurrency bug that exists in Nova code today due to missing barriers. Signed-off-by: Gary Guo --- Changes in v2: - Dropped `Acquire` and `Release` aliases of `Full` (Joel) - Use macros to implement most `MemoryBarrier` - Split Nova change to GSP->CPU commit and CPU->GSP commit (Joel) - Link to v1: https://patch.msgid.link/20260402152443.1059634-2-gary@kernel.org To: Miguel Ojeda To: Boqun Feng To: Gary Guo To: Björn Roy Baron To: Benno Lossin To: Andreas Hindborg To: Alice Ryhl To: Trevor Gross To: Danilo Krummrich To: Will Deacon To: Peter Zijlstra To: Mark Rutland To: Alexandre Courbot To: David Airlie To: Simona Vetter Cc: Alan Stern Cc: Andrea Parri Cc: Nicholas Piggin Cc: David Howells Cc: Jade Alglave Cc: Luc Maranget Cc: "Paul E. McKenney" Cc: Akira Yokosawa Cc: Daniel Lustig Cc: Joel Fernandes Cc: rust-for-linux@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: nova-gpu@lists.linux.dev Cc: dri-devel@lists.freedesktop.org Cc: lkmm@lists.linux.dev --- Gary Guo (4): rust: sync: add helpers for mb, dma_mb and friends rust: sync: generic memory barriers gpu: nova-core: fix barrier usage in CPU->GSP messaging path gpu: nova-core: fix barrier usage in GSP->CPU messaging path drivers/gpu/nova-core/gsp/cmdq.rs | 18 ++++++ drivers/gpu/nova-core/gsp/fw.rs | 12 ---- rust/helpers/barrier.c | 30 +++++++++ rust/kernel/sync/atomic/ordering.rs | 2 +- rust/kernel/sync/barrier.rs | 123 ++++++++++++++++++++++++++++-------- 5 files changed, 144 insertions(+), 41 deletions(-) --- base-commit: a87737435cfa134f9cdcc696ba3080759d04cf72 change-id: 20260609-rust-barrier-63078ea76216 Best regards, -- Gary Guo