From: David Laight <david.laight.linux@gmail.com>
To: Yunhui Cui <cuiyunhui@bytedance.com>
Cc: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
alex@ghiti.fr, dennis@kernel.org, tj@kernel.org, cl@gentwo.org,
oleg@redhat.com, ast@kernel.org, daniel@iogearbox.net,
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llvm@lists.linux.dev
Subject: Re: [PATCH v10 5/9] riscv: implement preemptible this_cpu add_return operations
Date: Thu, 12 Nov 2026 12:09:28 +0000 [thread overview]
Message-ID: <20261112120928.24145d44@pumpkin> (raw)
In-Reply-To: <20261112104149.38589-6-cuiyunhui@bytedance.com>
On Thu, 12 Nov 2026 18:41:45 +0800
Yunhui Cui <cuiyunhui@bytedance.com> wrote:
> Apply the recoverable per-CPU address handling to add-return operations.
>
> Native-width AMOs return the old value, so derive the new value required
> by the percpu API from the operand. Use Zabha for subword operations when
> available, or a masked LR/SC sequence that returns the updated field.
I can't help feeling that some of this code is the same as that for
normal atomic accesses.
Can they me merged?
David
next prev parent reply other threads:[~2026-11-12 12:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-12 10:41 [PATCH v10 0/9] riscv: optimize percpu access Yunhui Cui
2026-11-12 10:41 ` [PATCH v10 1/9] riscv: store percpu offset into thread_info Yunhui Cui
2026-11-12 10:41 ` [PATCH v10 2/9] riscv: add infrastructure for preemptible this_cpu operations Yunhui Cui
2026-11-12 11:05 ` sashiko-bot
2026-11-12 12:02 ` David Laight
2026-11-12 10:41 ` [PATCH v10 3/9] riscv: implement preemptible this_cpu read and write operations Yunhui Cui
2026-11-12 10:41 ` [PATCH v10 4/9] riscv: implement preemptible this_cpu void RMW operations Yunhui Cui
2026-11-12 10:41 ` [PATCH v10 5/9] riscv: implement preemptible this_cpu add_return operations Yunhui Cui
2026-11-12 11:30 ` bot+bpf-ci
2026-11-12 12:09 ` David Laight [this message]
2026-11-12 10:41 ` [PATCH v10 6/9] riscv: implement preemptible this_cpu xchg operations Yunhui Cui
2026-11-12 10:41 ` [PATCH v10 7/9] riscv: implement preemptible this_cpu cmpxchg operations Yunhui Cui
2026-11-12 10:41 ` [PATCH v10 8/9] riscv: implement preemptible this_cpu cmpxchg128 Yunhui Cui
2026-11-12 10:41 ` [PATCH v10 9/9] riscv: select HAVE_CMPXCHG_LOCAL Yunhui Cui
2026-11-12 11:30 ` bot+bpf-ci
2026-11-12 12:10 ` [PATCH v10 0/9] riscv: optimize percpu access Jisheng Zhang
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