linux-kernel - Re: [PATCH v3 -mm 9/9] netconsole: Support dynamic reconfiguration using configfs

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Date:	Tue, 31 Jul 2007 06:10:21 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Keiichi Kii <k-keiichi@...jp.nec.com>,
	Netdev <netdev@...r.kernel.org>,
	Joel Becker <joel.becker@...cle.com>,
	Matt Mackall <mpm@...enic.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v3 -mm 9/9] netconsole: Support dynamic reconfiguration
 using configfs



On Mon, 30 Jul 2007, Andrew Morton wrote:

> On Mon, 30 Jul 2007 08:19:10 +0530
> Satyam Sharma <satyam@...radead.org> wrote:
> 
> > +/*
> > + * Wrapper over simple_strtol (base 10) with sanity and range checking.
> > + * We return (signed) long only because we may want to return errors.
> > + * Do not use this to convert numbers that are allowed to be negative.
> > + */
> > +static long strtol10_check_range(const char *cp, long min, long max)
> > +{
> > +	long ret;
> > +	char *p = (char *) cp;
> > +
> > +	WARN_ON(min < 0);
> > +	WARN_ON(max < min);
> > +
> > +	ret = simple_strtol(p, &p, 10);
> > +
> > +	if (*p && (*p != '\n')) {
> > +		printk(KERN_ERR "netconsole: invalid input\n");
> > +		return -EINVAL;
> > +	}
> > +	if ((ret < min) || (ret > max)) {
> > +		printk(KERN_ERR "netconsole: input %ld must be between "
> > +				"%ld and %ld\n", ret, min, max);
> > +		return -EINVAL;
> > +	}
> > +
> > +	return ret;
> > +}
> 
> There's probably other code around the place which does this.  It might
> be worth making this function a general-purpose thing.

Probably, yes, I thought along similar lines.

[ BTW somewhere in the 9/9 patch I remember having to define a
  __U16_MAX as well. That could be pushed out to some generic
  or appropriate header as well, possibly. ]


Satyam
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