linux-kernel - Re: [PATCH 1/4] x86/mm, pat: Convert pat tree to generic interval tree

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Date:   Wed, 20 Nov 2019 19:05:52 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Davidlohr Bueso <dave@...olabs.net>
cc:     mingo@...nel.org, peterz@...radead.org, bp@...en8.de,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 1/4] x86/mm, pat: Convert pat tree to generic interval
 tree

On Mon, 21 Oct 2019, Davidlohr Bueso wrote:
>  int rbt_memtype_check_insert(struct memtype *new,
>  			     enum page_cache_mode *ret_type)
>  {
>  	int err = 0;
>  
>  	err = memtype_rb_check_conflict(&memtype_rbroot, new->start, new->end,
> -						new->type, ret_type);
> -
> -	if (!err) {
> -		if (ret_type)
> -			new->type = *ret_type;
> -
> -		new->subtree_max_end = new->end;
> -		memtype_rb_insert(&memtype_rbroot, new);
> -	}
> +					new->type, ret_type);
> +	if (err)
> +		goto done;

Please return err here. That goto is pointless.

> +
> +	if (ret_type)
> +		new->type = *ret_type;
> +	memtype_interval_insert(new, &memtype_rbroot);
> +done:
>  	return err;
>  }

Other than that.

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>