linux-kernel - Re: [PATCH] kernel/range.c: subtract_range: return instead of continue to save some loops

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Date:	Mon, 18 Mar 2013 10:52:37 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Lin Feng <linfeng@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, bhelgaas@...gle.com, linux-mm@...ck.org,
	x86@...nel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/range.c: subtract_range: return instead of
 continue to save some loops

On Mon, Mar 18, 2013 at 3:21 AM, Lin Feng <linfeng@...fujitsu.com> wrote:
> If we fall into that branch it means that there is a range fully covering the
> subtract range, so it's suffice to return there if there isn't any other
> overlapping ranges.
>
> Also fix the broken phrase issued by printk.
>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Signed-off-by: Lin Feng <linfeng@...fujitsu.com>
> ---
>  kernel/range.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/range.c b/kernel/range.c
> index 9b8ae2d..223c6fe 100644
> --- a/kernel/range.c
> +++ b/kernel/range.c
> @@ -97,10 +97,10 @@ void subtract_range(struct range *range, int az, u64 start, u64 end)
>                                 range[i].end = range[j].end;
>                                 range[i].start = end;
>                         } else {
> -                               printk(KERN_ERR "run of slot in ranges\n");
> +                               printk(KERN_ERR "run out of slot in ranges\n");

maybe could change to pr_err at the same time.

>                         }
>                         range[j].end = start;
> -                       continue;
> +                       return;

We don't say that ranges can not be overlapped in the array.

Thanks

Yinghai
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