linux-kernel - Re: [PATCH 04/10] xen/swiotlb: Move the nr_tbl determination in its own function.

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Message-ID: <alpine.DEB.2.02.1209141708300.29232@kaball.uk.xensource.com>
Date:	Fri, 14 Sep 2012 17:08:35 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [PATCH 04/10] xen/swiotlb: Move the nr_tbl determination in its
 own function.

On Mon, 10 Sep 2012, Konrad Rzeszutek Wilk wrote:
> Moving the function out of the way to prepare for the late
> SWIOTLB init.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>


Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>

>  drivers/xen/swiotlb-xen.c |   21 +++++++++++----------
>  1 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index 1afb4fb..a2aad6e 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -144,25 +144,26 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
>  	} while (i < nslabs);
>  	return 0;
>  }
> +static unsigned long xen_set_nslabs(unsigned long nr_tbl)
> +{
> +	if (!nr_tbl) {
> +		xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
> +		xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
> +	} else
> +		xen_io_tlb_nslabs = nr_tbl;
>  
> +	return xen_io_tlb_nslabs << IO_TLB_SHIFT;
> +}
>  void __init xen_swiotlb_init(int verbose)
>  {
>  	unsigned long bytes;
>  	int rc = -ENOMEM;
> -	unsigned long nr_tbl;
>  	char *m = NULL;
>  	unsigned int repeat = 3;
>  
> -	nr_tbl = swiotlb_nr_tbl();
> -	if (nr_tbl)
> -		xen_io_tlb_nslabs = nr_tbl;
> -	else {
> -		xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
> -		xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
> -	}
> +	xen_io_tlb_nslabs = swiotlb_nr_tbl();
>  retry:
> -	bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
> -
> +	bytes = xen_set_nslabs(xen_io_tlb_nslabs);
>  	/*
>  	 * Get IO TLB memory from any location.
>  	 */
> -- 
> 1.7.7.6
> 
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