From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0264E36B07E for ; Fri, 31 Jul 2026 20:30:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785529842; cv=none; b=P+VeDjIR/0wkFQNIMg6Ct96Dld7li+R/x2KA4M6M4o8h3enc3QUT8stouTAdXwOpQeQI/iWERPop9+vO0SMcSw++OHX9Ne0M0EypyL02zH2N0HJPcJWI5X7CNxxhPgExiPwdBkoGUx8Sqm0wqcJroEtNkrZMstSx5VcPSxdjIck= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785529842; c=relaxed/simple; bh=4BkVH0/j/Gwh34+8M3f7Tf2d6QCZi99x/X2fObTdrXo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=HGNf7ulc9Mhn3Um1L0rAbbysE7LUlHaY803wP3L56ifcULEjphXDQrX1DWuaSUDahyw474fCATpufv0Oy2kYcCBtHzbGM3EO0prT3cNBeQ5+wD6eslhlvS0PXhM3yXP7JM3GJ097YRQS0mD6COcTGfAABb6K0lXHMu6oMwR1/8M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WmE5Y5nb; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WmE5Y5nb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C09C1F00ACF; Fri, 31 Jul 2026 20:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785529840; bh=fQ4AaC8H0CX0x0IrCa68P6L0DHE1akOk2IAMbYKQ2xI=; h=From:To:Cc:Subject:Date; b=WmE5Y5nbjMS4lZ+NQnVUkN4qJMqHRdNBCokV1Gh48zoNFACdD1Tv186SsL8eyK7Mb O75uiEwEk0Knd8BDnzDDk5z9HvAU6iv9XChQoD7JTKHMpFF0d6bqC9p74WYz9TEwkN TRCvi+hEmUK/qCeFbeulRPfq3VaNgTr2VsytDfmBO1INwNV3PvST/uPpETchmVoBn3 G7cVc22o3paS3IPICkPnBolSnGQL7gnlYjPNbFknsXmQDCgwaa313mcG3GzFtoMbC1 IHQ0YwAZlTQl+zUasJAQTbvQ3MA8HoRAv2w+2Vo1tWC/rW+BbRy4Sk+W8UziselNP/ uMDICUZGs/Ilg== Received: from phl-compute-03.internal (phl-compute-03.internal [10.202.2.43]) by mailfauth.phl.internal (Postfix) with ESMTP id 5174AF40077; Fri, 31 Jul 2026 16:30:39 -0400 (EDT) Received: from phl-frontend-04 ([10.202.2.163]) by phl-compute-03.internal (MEProxy); Fri, 31 Jul 2026 16:30:39 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: dmFkZTEd4/pmsDuZlwvEyfWP1meg6cHnYCF2dXuUGa6l8w8IY0R74pPF6Ji56vm7lwMe4e wc755Qkaf/+LUMByk+RmBGNqoNJy820EjsB/M03QpZO9FyNJMZweSomkoCieWs4nqP+2IU kOu8y1079cg+uga0ZazhoCnF+S5ezHTwnwZG2L7YP6iA3k+Rou9onwUeMZ4heXpUoyhmgu qjvRZWRZE3pMEjRplJfD72B+py/OGAmQPpXsuav8wVU+8D0AkT2G+/dPMoePYojg19VOJb 58VUcUkiVZrVY97rDl1jKSehuh7PfWsovWTFd2OgW+me6gGLKTgxolf5geP/sYQo1I0eMg VdYAIwopldjeWgA5wQUW+ZpHFJf6oT24HfAPEXt1XHdRca5I0PXdDgNBMBNYVefwUtIivy N3WymnetCcu8G4exL1jPUJOmRLbZyeO7Vpuk5iqUUM1g4IhMgNVNaaPDM1WojKajN4aKT8 MXeLEOQ8BX0UZBdJPCfnNr87neoNZA2HjRwuEptWH+r8HtxkfguJ2gLVbTR8epHd0u0ki2 0Obxzok6969HZzurmj/U7bPj6FErfPpvQXALqBZosr0pw2m8tq1ZdmClL4zAGB6Vjptt9K NMXOy9UXcOwOw1CcepyFtg1ZCRSrIG4iwDP6GEfyW0RZaAoThUnQNpSOBI3g X-ME-Proxy: Feedback-ID: i8dbe485b:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Fri, 31 Jul 2026 16:30:38 -0400 (EDT) From: Boqun Feng To: Peter Zijlstra Cc: "Ingo Molnar" , "Will Deacon" , "Boqun Feng" , "Waiman Long" , "Gary Guo" , "Alice Ryhl" , "Lyude Paul" , "Daniel Almeida" , =?UTF-8?q?Onur=20=C3=96zkan?= , "Miguel Ojeda" , "Danilo Krummrich" , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org Subject: [GIT PULL] [PATCH 00/24] Rust synchronization changes for v7.3 Date: Fri, 31 Jul 2026 13:30:01 -0700 Message-ID: <20260731203031.13679-1-boqun@kernel.org> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Peter, Please pull this Rust synchronization changes for v7.3 into tip. The major changes are the introduction of preempt_count backed interrupt disabling level tracking, i.e. the local_interrupt_{enable, disable}(), along with the user (the Rust SpinLockIrq). This should unblock a few drivers in Rust. For other changes, please refer the following change log. The following changes since commit 5e601ab3615c86be7c4068ce992f94654693a032: futex: Optimise the size check get_futex_key() (2026-07-29 13:17:52 +0200) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git tags/rust-sync.20260731a for you to fetch changes up to 93ff5657a5f1d0d8577b58e66bc116a1e0f38a87: rust: revocable: Use LKMM atomics instead of Rust atomics (2026-07-30 13:38:53 -0700) ---------------------------------------------------------------- Rust synchronization changes for v7.3: * Safe SpinLockIrq - Introduce refcounted interrupt disabling and corresponding spinlock primitives, which tracks the interrupt disabling "level" in preempt_count, as a result, this set of primitives can automatically restore the interrupt disabling status when the outermost critical section exits. - Based on the above, a SpinLockIrq is introduced on the Rust side, the guard of which will automatically restore the interrupt disabling status when dropped. This avoid playing unsafe games when using irq disabled spinlocks. * Add synchronize_rcu() safe abstraction. * Generic memory barrier: this extends our Rust barrier primitives to include more barriers for DMA as well. * Replace the atomic usage in Revocable with LKMM atomics. -----BEGIN PGP SIGNATURE----- iQFhBAABCABLFiEEj5IosQTPz8XU1wRHSXnow7UH+rgFAmptA2MbFIAAAAAABAAO bWFudTIsMi41KzEuMTIsMCwzERxib3F1bkBrZXJuZWwub3JnAAoJEEl56MO1B/q4 UBAH/108a8dCkDaK3MUuS0SeuqY57EPwLCTE/k4gJK35XlF0fCpEPfFtqfEs6xkG E0rMhSx3bDmtfccEo16LOkmbcrSx3NSsc9KlSRiYRywptT+CRld5FPqmJqDd2nCh mYYUsNppEXFd4rUiGfKAcVeLHD+PCio0/ElNN7X3TCfQgtWUuDp4pcB23m9t6ste Re4idhKoTmqeKTX3N8AuQ0QMsr1FNNLu0ESpUv1n6/DrEB1g8XevF1J2PKYr9fxt aahCMk2qQF3vDCi4Ydh9o9AWqSkinU2yIW64ZBWRC2S7QBVRIrPAEtX4V/n7d/n+ 2irbb1ZuVu5zFD0/CyNkgyQM/og= =DzLT -----END PGP SIGNATURE----- Regards, Boqun ---------------------------------------------------------------- Boqun Feng (10): preempt: Introduce HARDIRQ_DISABLE_BITS preempt: Introduce __preempt_count_{sub, add}_return() irq & spin_lock: Add counted interrupt disabling/enabling locking: Switch to _irq_{disable,enable}() variants in cleanup guards sched: Remove the unused preempt_offset parameter of __cant_sleep() sched: Avoid signed comparison of preempt_count() in __cant_migrate() preempt: Introduce HAS_SEPARATE_PREEMPT_RESCHED_BITS arm64: sched/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS irq: Optimize reschedule check in local_interrupt_enable() rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers Gary Guo (3): rust: sync: Add helpers for mb, dma_mb and friends rust: sync: Add generic memory barriers rust: revocable: Use LKMM atomics instead of Rust atomics Heiko Carstens (1): s390/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS Joel Fernandes (1): preempt: Track NMI nesting to separate per-CPU counter Lyude Paul (6): openrisc: Include in smp.h irq: Add KUnit test for refcounted interrupt enable/disable rust: Introduce interrupt module rust: sync: use super::* in spinlock.rs rust: sync: Add SpinLockIrq rust: sync: Introduce SpinLockIrq::lock_with() and friends Philipp Stanner (3): rust: sync: Add abstraction for synchronize_rcu() rust: revocable: Use safe synchronize_rcu() abstraction rust: sync: Use safe synchronize_rcu() abstraction in poll arch/arm64/Kconfig | 1 + arch/arm64/include/asm/preempt.h | 18 ++ arch/openrisc/include/asm/smp.h | 2 + arch/s390/Kconfig | 1 + arch/s390/include/asm/lowcore.h | 13 +- arch/s390/include/asm/preempt.h | 49 ++-- arch/x86/Kconfig | 1 + arch/x86/include/asm/preempt.h | 61 +++-- arch/x86/kernel/cpu/common.c | 2 +- include/asm-generic/preempt.h | 14 ++ include/linux/hardirq.h | 41 ++- include/linux/interrupt_rc.h | 76 ++++++ include/linux/kernel.h | 4 +- include/linux/preempt.h | 35 ++- include/linux/spinlock.h | 35 ++- include/linux/spinlock_api_smp.h | 41 +++ include/linux/spinlock_api_up.h | 16 ++ include/linux/spinlock_rt.h | 18 ++ kernel/Kconfig.preempt | 4 + kernel/irq/Makefile | 1 + kernel/irq/refcount_interrupt_test.c | 109 ++++++++ kernel/locking/spinlock.c | 29 +++ kernel/sched/core.c | 18 +- kernel/softirq.c | 22 +- lib/locking-selftest.c | 2 +- rust/helpers/barrier.c | 30 +++ rust/helpers/helpers.c | 1 + rust/helpers/interrupt.c | 18 ++ rust/helpers/spinlock.c | 15 ++ rust/helpers/sync.c | 5 + rust/kernel/interrupt.rs | 89 +++++++ rust/kernel/lib.rs | 1 + rust/kernel/revocable.rs | 28 ++- rust/kernel/sync.rs | 9 +- rust/kernel/sync/atomic/ordering.rs | 2 +- rust/kernel/sync/barrier.rs | 127 +++++++--- rust/kernel/sync/lock/global.rs | 3 + rust/kernel/sync/lock/spinlock.rs | 331 ++++++++++++++++++++++++- rust/kernel/sync/poll.rs | 10 +- rust/kernel/sync/rcu.rs | 16 ++ tools/testing/selftests/bpf/bpf_experimental.h | 7 +- 41 files changed, 1184 insertions(+), 121 deletions(-) create mode 100644 include/linux/interrupt_rc.h create mode 100644 kernel/irq/refcount_interrupt_test.c create mode 100644 rust/helpers/interrupt.c create mode 100644 rust/kernel/interrupt.rs