Re: [PATCH v3 11/13] riscv: cpu_relax: switch to riscv_has_extension_likely()

[Conor Dooley]

On Thu, Jan 12, 2023 at 01:10:25AM +0800, Jisheng Zhang wrote:
> Switch cpu_relax() from static branch to the new helper
> riscv_has_extension_likely()
> 
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
> Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
> Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>
> Reviewed-by: Guo Ren <guoren@xxxxxxxxxx>

With the same caveat here as with fpu, may as well join the
posse once more...
Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

> ---
>  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. */
> -- 
> 2.38.1
> 
> 
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