linux-kernel - Re: SCSI errors on powerpc with 2.6.24-rc6-mm1

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Date:	Fri, 28 Dec 2007 13:05:39 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	linuxppc-dev@...abs.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: SCSI errors on powerpc with 2.6.24-rc6-mm1

FUJITA Tomonori wrote:
[snip]
> Thanks,
> 
> Can you try this?
> 
> 
> diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
> index e7d8544..495575a 100644
> --- a/lib/iommu-helper.c
> +++ b/lib/iommu-helper.c
> @@ -8,15 +8,20 @@
>  static unsigned long find_next_zero_area(unsigned long *map,
>  					 unsigned long size,
>  					 unsigned long start,
> -					 unsigned int nr)
> +					 unsigned int nr,
> +					 unsigned long align_mask)
>  {
>  	unsigned long index, end, i;
>  again:
>  	index = find_next_zero_bit(map, size, start);
> +
> +	/* Align allocation */
> +	index = (index + align_mask) & ~align_mask;
> +
>  	end = index + nr;
> -	if (end > size)
> +	if (end >= size)
>  		return -1;
> -	for (i = index + 1; i < end; i++) {
> +	for (i = index; i < end; i++) {
>  		if (test_bit(i, map)) {
>  			start = i+1;
>  			goto again;
> @@ -50,9 +55,8 @@ unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
>  {
>  	unsigned long index;
>  again:
> -	index = find_next_zero_area(map, size, start, nr);
> +	index = find_next_zero_area(map, size, start, nr, align_mask);
>  	if (index != -1) {
> -		index = (index + align_mask) & ~align_mask;
>  		if (is_span_boundary(index, nr, shift, boundary_size)) {
>  			/* we could do more effectively */
>  			start = index + 1;

This on top of -mm? Or on top of the reverted iommu patch.


-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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