Re: [PATCH v3 13/15] livepatch: change to a per-task consistency model

[Miroslav Benes]

> @@ -740,6 +809,14 @@ int klp_register_patch(struct klp_patch *patch)
>  		return -ENODEV;
>  
>  	/*
> +	 * Architectures without reliable stack traces have to set
> +	 * patch->immediate because there's currently no way to patch kthreads
> +	 * with the consistency model.
> +	 */
> +	if (!klp_have_reliable_stack() && !patch->immediate)
> +		return -ENOSYS;
> +

I think an error message (pr_err) would be appropriate here. 

$ insmod patch_1.ko
insmod: ERROR: could not insert module patch_1.ko: Function not implemented

is not helpful much :)

Miroslav