linux-kernel - Re: [PATCH 2/2] aoe: use min() to simplify the code

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Date:	Thu, 1 Aug 2013 21:13:40 -0400
From:	Ed Cashin <ecashin@...aid.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:	<linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] aoe: use min() to simplify the code

Thanks.

I agree that we could do that.  I'm not sure it increases readability to put this much stuff on one line, though.  What is the motivation?

On Aug 1, 2013, at 8:28 AM, Andy Shevchenko wrote:

> min() incorporates condition in it. In our case we could do assignment and
> make a choice at once.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> drivers/block/aoe/aoedev.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
> index db35ef6..92fadfa 100644
> --- a/drivers/block/aoe/aoedev.c
> +++ b/drivers/block/aoe/aoedev.c
> @@ -13,6 +13,7 @@
> #include <linux/kdev_t.h>
> #include <linux/moduleparam.h>
> #include <linux/string.h>
> +#include <linux/kernel.h>
> #include "aoe.h"
> 
> static void dummy_timer(ulong);
> @@ -248,10 +249,7 @@ user_req(char *s, size_t slen, struct aoedev *d)
> 	if (!d->gd)
> 		return 0;
> 	p = kbasename(d->gd->disk_name);
> -	lim = sizeof(d->gd->disk_name);
> -	lim -= p - d->gd->disk_name;
> -	if (slen < lim)
> -		lim = slen;
> +	lim = min(sizeof(d->gd->disk_name) - (p - d->gd->disk_name), slen);
> 
> 	return !strncmp(s, p, lim);
> }
> -- 
> 1.8.3.2
> 

-- 
  Ed Cashin
  ecashin@...aid.com


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