From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>
Cc: vladimir.murzin@arm.com, ryan.roberts@arm.com,
usama.anjum@arm.com, Will Deacon <will@kernel.org>,
peterz@infradead.org, catalin.marinas@arm.com,
david.laight.linux@gmail.com, stable@vger.kernel.org,
ruanjinjie@huawei.com, james.morse@arm.com,
yang@os.amperecomputing.com, cl@gentwo.org, maz@kernel.org,
david@kernel.org, ljs@kernel.org, kernel-team@android.com,
ardb@kernel.org
Subject: Re: [PATCH v4 00/21] Preemptible this_cpu_*() operations
Date: Fri, 11 Sep 2026 14:44:10 +0100 [thread overview]
Message-ID: <178912994348.2451035.18388822109867455442.b4-ty@kernel.org> (raw)
In-Reply-To: <20260908151741.394589-1-mark.rutland@arm.com>
On Tue, 08 Sep 2026 16:17:20 +0100, Mark Rutland wrote:
> This series reworks arm64's this_cpu_*() operations such that they do
> not need to disable preemption. The scheme is described in detail in patch 13,
> and is similar to the approach Heiko Carstens applied to s390 [1], which
> inspired this series.
>
> This scheme should build and function in all kernel configurations (e.g.
> regardless of KPTI, SW PAN, CNP, VA BITS), and has no dependency on new
> architectural features. The fixup logic should "just work" with kprobes,
> etc, and I don't expect that this will need to become more complicated.
>
> [...]
Applied first three fixes to arm64 (for-next/fixes), thanks!
[01/21] arm64: percpu: Fix this_cpu_write() casting
https://git.kernel.org/arm64/c/885bff055a0f
[02/21] arm64: percpu: Fix this_cpu_and() mask generation
https://git.kernel.org/arm64/c/44274c657256
[03/21] arm64: percpu: Fix LSE operations on {8,16}-bit types
https://git.kernel.org/arm64/c/8cf2093f5372
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
prev parent reply other threads:[~2026-09-11 13:44 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-08 15:17 [PATCH v4 00/21] Preemptible this_cpu_*() operations Mark Rutland
2026-09-08 15:17 ` [PATCH v4 01/21] arm64: percpu: Fix this_cpu_write() casting Mark Rutland
2026-09-10 10:56 ` Lorenzo Stoakes (ARM)
2026-09-08 15:17 ` [PATCH v4 02/21] arm64: percpu: Fix this_cpu_and() mask generation Mark Rutland
2026-09-08 15:17 ` [PATCH v4 03/21] arm64: percpu: Fix LSE operations on {8,16}-bit types Mark Rutland
2026-09-10 15:18 ` Vladimir Murzin
2026-09-08 15:17 ` [PATCH v4 04/21] arm64: cmpxchg: LL/SC: Avoid redundant extension Mark Rutland
2026-09-08 15:17 ` [PATCH v4 05/21] arm64: cmpxchg128: LSE: Remove redundant operands Mark Rutland
2026-09-10 10:06 ` Vladimir Murzin
2026-09-11 11:43 ` Mark Rutland
2026-09-08 15:17 ` [PATCH v4 06/21] arm64: preempt: Simplify and optimize __preempt_count_dec_and_test() Mark Rutland
2026-09-08 15:17 ` [PATCH v4 07/21] arm64: preempt: Treat should_resched() as unlikely Mark Rutland
2026-09-08 15:17 ` [PATCH v4 08/21] arm64: ptrace: Always inline pt_regs_[read,write}_reg() Mark Rutland
2026-09-11 10:20 ` Vladimir Murzin
2026-09-08 15:17 ` [PATCH v4 09/21] arm64: percpu: Factor out percpu offset asm Mark Rutland
2026-09-11 12:39 ` Vladimir Murzin
2026-09-08 15:17 ` [PATCH v4 10/21] arm64: gpr-num: Add wxN aliases for wN registers Mark Rutland
2026-09-11 12:43 ` Vladimir Murzin
2026-09-08 15:17 ` [PATCH v4 11/21] arm64: gpr-num: add __GPR_NUM() helper Mark Rutland
2026-09-10 14:24 ` Vladimir Murzin
2026-09-08 15:17 ` [PATCH v4 12/21] arm64: entry: sdei: Restore all clobberable GPRs Mark Rutland
2026-09-11 12:47 ` Vladimir Murzin
2026-09-08 15:17 ` [PATCH v4 13/21] arm64: entry: sdei: Make 'tsk' available Mark Rutland
2026-09-10 13:06 ` Vladimir Murzin
2026-09-08 15:17 ` [PATCH v4 14/21] arm64: percpu: Add infrastructure for preemptible this_cpu_*() ops Mark Rutland
2026-09-08 15:17 ` [PATCH v4 15/21] arm64: percpu: Implement preemptible read/write ops Mark Rutland
2026-09-08 15:17 ` [PATCH v4 16/21] arm64: percpu: Implement preemptible void RMW ops Mark Rutland
2026-09-08 15:17 ` [PATCH v4 17/21] arm64: percpu: Implement preemptible return " Mark Rutland
2026-09-08 15:17 ` [PATCH v4 18/21] arm64: percpu: Implement preemptible XCHG ops Mark Rutland
2026-09-08 15:17 ` [PATCH v4 19/21] arm64: percpu: Implement preemptible CMPXCHG ops Mark Rutland
2026-09-08 15:17 ` [PATCH v4 20/21] arm64: percpu: Implement preemptible CMPXCHG128 ops Mark Rutland
2026-09-08 15:17 ` [PATCH v4 21/21] arm64: percpu: Remove _pcp_protect*() wrappers Mark Rutland
2026-09-11 13:44 ` Will Deacon [this message]
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