linux-kernel - Re: [PATCH 3/3] drivers/s390/block/dcssblk.c: Fix Unlikely(x) != y

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Date:	Sun, 17 Feb 2008 10:12:33 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	schwidefsky@...ibm.com, linux390@...ibm.com,
	linux-s390@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] drivers/s390/block/dcssblk.c: Fix Unlikely(x) != y

On Sat, Feb 16, 2008 at 05:16:26PM +0100, Roel Kluin wrote:
> The patch below was not yet tested. If it's correct as it is, please comment.
> ---
> Fix Unlikely(x) != y
> 
> Signed-off-by: Roel Kluin <12o3l@...cali.nl>
> ---
> diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
> index 3faf053..e6c94db 100644
> --- a/drivers/s390/block/dcssblk.c
> +++ b/drivers/s390/block/dcssblk.c
> @@ -666,7 +666,7 @@ dcssblk_make_request(struct request_queue *q, struct bio *bio)
>  		page_addr = (unsigned long)
>  			page_address(bvec->bv_page) + bvec->bv_offset;
>  		source_addr = dev_info->start + (index<<12) + bytes_done;
> -		if (unlikely(page_addr & 4095) != 0 || (bvec->bv_len & 4095) != 0)
> +		if (unlikely((page_addr & 4095) != 0) || (bvec->bv_len & 4095) != 0)
>  			// More paranoia.
>  			goto fail;
>  		if (bio_data_dir(bio) == READ) {

Your patch is correct, thank you! At least it wasn't a real bug. Will be applied.
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