Re: [PATCH 7/8] riscv: cpu_relax: switch to riscv_has_extension_likely()

Andrew Jones
2022-10-06T13:37:40Z

On Thu, Oct 06, 2022 at 03:08:17PM +0800, Jisheng Zhang wrote:
> Switch cpu_relax() from statich branch to the new helper
> riscv_has_extension_likely()
>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> ---
> 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 1e4f8b4aef79..fb30480f36a0 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
>

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>