[PATCH 2/9] riscv: Fix riscv_online_cpu_vec

[Alexandre Ghiti]

On 07/02/2025 17:19, Andrew Jones wrote:
> We shouldn't probe when we already know vector is unsupported and
> we should probe when we see we don't yet know whether it's supported.
> Furthermore, we should ensure we've set the access type to
> unsupported when we don't have vector at all.
>
> Fixes: e7c9d66e313b ("RISC-V: Report vector unaligned access speed hwprobe")
> Signed-off-by: Andrew Jones <ajones at ventanamicro.com>
> ---
>   arch/riscv/kernel/unaligned_access_speed.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c
> index b7a8ff7ba6df..161964cf2abc 100644
> --- a/arch/riscv/kernel/unaligned_access_speed.c
> +++ b/arch/riscv/kernel/unaligned_access_speed.c
> @@ -367,10 +367,12 @@ static void check_vector_unaligned_access(struct work_struct *work __always_unus
>   
>   static int riscv_online_cpu_vec(unsigned int cpu)
>   {
> -	if (!has_vector())
> +	if (!has_vector()) {
> +		per_cpu(vector_misaligned_access, cpu) = RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED;
>   		return 0;
> +	}
>   
> -	if (per_cpu(vector_misaligned_access, cpu) != RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED)
> +	if (per_cpu(vector_misaligned_access, cpu) != RISCV_HWPROBE_MISALIGNED_VECTOR_UNKNOWN)
>   		return 0;
>   
>   	check_vector_unaligned_access_emulated(NULL);


Reviewed-by: Alexandre Ghiti <alexghiti at rivosinc.com>

Thanks,

Alex