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

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Date:	Fri, 02 Aug 2013 12:15:11 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Ed Cashin <ecashin@...aid.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

On Thu, 2013-08-01 at 21:13 -0400, Ed Cashin wrote: 
> 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?

Motivation is to explicitly show that that operation is to calculate a
minimum of two the slen parameter and the length of last part of the
disk_name.

It seems matter of taste, so, I'm okay with current piece of code.

> > 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
> > 
> 

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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