linux-kernel - Re: [PATCH 05/12] swiotlb-xen: suppress certain init retries

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Date:   Fri, 10 Sep 2021 16:18:20 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Jan Beulich <jbeulich@...e.com>
cc:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 05/12] swiotlb-xen: suppress certain init retries

On Tue, 7 Sep 2021, Jan Beulich wrote:
> Only on the 2nd of the paths leading to xen_swiotlb_init()'s "error"
> label it is useful to retry the allocation; the first one did already
> iterate through all possible order values.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>

Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>


> ---
> I'm not convinced of the (lack of) indentation of the label, but I made
> the new one matzch the existing one.
> 
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -184,7 +184,7 @@ retry:
>  		order--;
>  	}
>  	if (!start)
> -		goto error;
> +		goto exit;
>  	if (order != get_order(bytes)) {
>  		pr_warn("Warning: only able to allocate %ld MB for software IO TLB\n",
>  			(PAGE_SIZE << order) >> 20);
> @@ -214,6 +214,7 @@ error:
>  		pr_info("Lowering to %luMB\n", bytes >> 20);
>  		goto retry;
>  	}
> +exit:
>  	pr_err("%s (rc:%d)\n", xen_swiotlb_error(m_ret), rc);
>  	return rc;
>  }
>