linux-kernel - Re: [PATCH] Fix missing 'cnt' in ?: in dmatest

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Message-ID: <20110821011240.GG2203@ZenIV.linux.org.uk>
Date:	Sun, 21 Aug 2011 02:12:40 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"Dr. David Alan Gilbert" <linux@...blig.org>
Cc:	linux-kernel@...r.kernel.org, nicolas.ferre@...el.com,
	dan.j.williams@...el.com, akpm@...ux-foundation.org
Subject: Re: [PATCH] Fix missing 'cnt' in ?: in dmatest

On Sun, Aug 21, 2011 at 01:50:31AM +0100, Dr. David Alan Gilbert wrote:

> (WTH is x=y?:z legal C anyway?)

gccism.  It's not legal C; it's a gcc extension, and not a pretty one at
that.  It's almost definitely a bug in this case - what used to be in the
tree is equivalent to cnt > 0 ? cnt > 0 : 0, i.e. cnt > 0 ? 1 : 0, i.e.
cnt > 0.  AFAICS, after your patch it does make sense.

> Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
> 
> ---
> diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
> index 765f5ff..1b0ec9d 100644
> --- a/drivers/dma/dmatest.c
> +++ b/drivers/dma/dmatest.c
> @@ -572,7 +572,7 @@ static int dmatest_add_channel(struct dma_chan *chan)
>  	}
>  	if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
>  		cnt = dmatest_add_threads(dtc, DMA_PQ);
> -		thread_count += cnt > 0 ?: 0;
> +		thread_count += cnt > 0 ? cnt : 0;
>  	}
>  
>  	pr_info("dmatest: Started %u threads using %s\n",
> 
> -- 
>  -----Open up your eyes, open up your mind, open up your code -------   
> / Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
> \ gro.gilbert @ treblig.org |                               | In Hex /
>  \ _________________________|_____ http://www.treblig.org   |_______/
> --
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