linux-kernel - Re: [PATCH v2 11/13] riscv: cpu_relax: switch to riscv_has_extension

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Date:   Mon, 5 Dec 2022 08:52:18 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Andrew Jones <ajones@...tanamicro.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 11/13] riscv: cpu_relax: switch to riscv_has_extension_likely()

Reviewed-by: Guo Ren <guoren@...nel.org>

On Mon, Dec 5, 2022 at 1:57 AM Jisheng Zhang <jszhang@...nel.org> wrote:
>
> Switch cpu_relax() from statich branch to the new helper
> riscv_has_extension_likely()
>
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> Reviewed-by: Heiko Stuebner <heiko@...ech.de>
> ---
>  arch/riscv/include/asm/vdso/processor.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/vdso/processor.h b/arch/riscv/include/asm/vdso/processor.h
> index fa70cfe507aa..edf0e25e43d1 100644
> --- a/arch/riscv/include/asm/vdso/processor.h
> +++ b/arch/riscv/include/asm/vdso/processor.h
> @@ -10,7 +10,7 @@
>
>  static inline void cpu_relax(void)
>  {
> -       if (!static_branch_likely(&riscv_isa_ext_keys[RISCV_ISA_EXT_KEY_ZIHINTPAUSE])) {
> +       if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZIHINTPAUSE)) {
>  #ifdef __riscv_muldiv
>                 int dummy;
>                 /* In lieu of a halt instruction, induce a long-latency stall. */
> --
> 2.37.2
>


-- 
Best Regards
 Guo Ren