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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martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev,
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llvm@lists.linux.dev
Subject: Re: [PATCH v10 2/9] riscv: add infrastructure for preemptible this_cpu operations
Date: Thu, 12 Nov 2026 12:02:48 +0000 [thread overview]
Message-ID: <20261112120248.5c8265e2@pumpkin> (raw)
In-Reply-To: <20261112104149.38589-3-cuiyunhui@bytedance.com>
On Thu, 12 Nov 2026 18:41:42 +0800
Yunhui Cui <cuiyunhui@bytedance.com> wrote:
> +/*
> + * Mark a region where the per-CPU offset and address registers may need to
> + * be rewritten by exception return after migration. The three registers
> + * must remain distinct for the whole region.
> + */
> +#define __PCPU_GPRS_BEGIN \
> + __DEFINE_ASM_GPR_NUMS \
> + __PCPU_GPRS_ASSERT_DISTINCT \
> + "li %[off], " __PCPU_GPRS_VALUE "\n" \
> + "sh %[off], %[gprs]\n" \
> + REG_L " %[off], %[pcpu_offset]\n" \
> + "add %[addr], %[pcp], %[off]\n"
> +
> +#define __PCPU_GPRS_END \
> + "sh zero, %[gprs]\n"
Those are quite nasty with all the hidden variable names.
It wouldn't do any harm to pass the names though.
David
next prev parent reply other threads:[~2026-11-12 12:02 UTC|newest]
Thread overview: 14+ 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 12:02 ` David Laight [this message]
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
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
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