linux-kernel - Re: [PATCH 02/10] [SG] Update block layer to use sg helpers

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Date:	Tue, 23 Oct 2007 07:13:16 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390@...r.kernel.org
Subject: Re: [PATCH 02/10] [SG] Update block layer to use sg helpers

On Mon, Oct 22, 2007 at 08:10:56PM +0200, Jens Axboe wrote:
> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
> ---
>  block/ll_rw_blk.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
> index 8025d64..61c2e39 100644
> --- a/block/ll_rw_blk.c
> +++ b/block/ll_rw_blk.c
> @@ -1354,8 +1354,9 @@ new_segment:
>  			else
>  				sg = sg_next(sg);
> 
> -			memset(sg, 0, sizeof(*sg));
> -			sg->page = bvec->bv_page;
> +			sg_dma_len(sg) = 0;
> +			sg_dma_address(sg) = 0;
> +			sg_set_page(sg, bvec->bv_page);
>  			sg->length = nbytes;
>  			sg->offset = bvec->bv_offset;
>  			nsegs++;
> @@ -1363,6 +1364,9 @@ new_segment:
>  		bvprv = bvec;
>  	} /* segments in rq */
> 
> +	if (sg)
> +		__sg_mark_end(sg);
> +
>  	return nsegs;
>  }

Hmm.... this breaks s390:

  CC      block/ll_rw_blk.o
block/ll_rw_blk.c: In function 'blk_rq_map_sg':
block/ll_rw_blk.c:1357: error: implicit declaration of function 'sg_dma_len'
block/ll_rw_blk.c:1357: error: lvalue required as left operand of assignment
block/ll_rw_blk.c:1358: error: implicit declaration of function 'sg_dma_address'
block/ll_rw_blk.c:1358: error: lvalue required as left operand of assignment
make[1]: *** [block/ll_rw_blk.o] Error 1

Missing macros and no appropriate members in struct scatterlist since we
don't have DMA. How to fix?
-
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