Re: [RFC PATCH v2 14/15] unwind_user/backchain: Introduce back chain user space unwinding

[Josh Poimboeuf]

On Fri, Dec 05, 2025 at 06:14:45PM +0100, Jens Remus wrote:
> @@ -159,6 +165,10 @@ static int unwind_user_next(struct unwind_user_state *state)
>  			if (!unwind_user_next_fp(state))
>  				return 0;
>  			continue;
> +		case UNWIND_USER_TYPE_BACKCHAIN:
> +			if (!unwind_user_next_backchain(state))
> +				return 0;
> +			continue;		/* Try next method. */
>  		default:
>  			WARN_ONCE(1, "Undefined unwind bit %d", bit);
>  			break;
> @@ -187,6 +197,8 @@ static int unwind_user_start(struct unwind_user_state *state)
>  		state->available_types |= UNWIND_USER_TYPE_SFRAME;
>  	if (IS_ENABLED(CONFIG_HAVE_UNWIND_USER_FP))
>  		state->available_types |= UNWIND_USER_TYPE_FP;
> +	if (IS_ENABLED(CONFIG_HAVE_UNWIND_USER_BACKCHAIN))
> +		state->available_types |= UNWIND_USER_TYPE_BACKCHAIN;

Any reason not to just use the existing CONFIG_HAVE_UNWIND_USER_FP hook
here rather than create the new BACKCHAIN one?

-- 
Josh