[PATCH v11 22/40] arm64/sme: Implement ptrace support for streaming mode SVE registers

[Catalin Marinas]

On Mon, Feb 07, 2022 at 03:20:51PM +0000, Mark Brown wrote:
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index 2242c14a5a05..8b111b7f2006 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -645,14 +645,19 @@ static void __fpsimd_to_sve(void *sst, struct user_fpsimd_state const *fst,
>   */
>  static void fpsimd_to_sve(struct task_struct *task)
>  {
> -	unsigned int vq;
> +	unsigned int vq, vl;
>  	void *sst = task->thread.sve_state;
>  	struct user_fpsimd_state const *fst = &task->thread.uw.fpsimd_state;
>  
>  	if (!system_supports_sve())
>  		return;
>  
> -	vq = sve_vq_from_vl(task_get_sve_vl(task));
> +	if (thread_sm_enabled(&task->thread))
> +		vl = task_get_sme_vl(task);
> +	else
> +		vl = task_get_sve_vl(task);

I saw this construct in the signal patches as well. Can we have a
function/macro that checks the SM enabled and returns the proper vl?

Otherwise,

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>