linux-kernel - Re: [PATCH 1/1 linux-next] exofs: convert simple

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Date:	Thu, 30 Apr 2015 14:06:51 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	fabf@...net.be, ooo@...ctrozaur.com
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1 linux-next] exofs: convert simple_str to kstr

>   case Opt_pid:
> + {
> + int rc;
> +
>   if (0 == match_strlcpy(str, &args[0], sizeof(str)))
>   return -EINVAL;
> - opts->pid = simple_strtoull(str, NULL, 0);
> + rc = kstrtoull(str, 0, &opts->pid);
> + if (rc)
> + return rc;

kstrto*() functions were designed for proc/sysfs/sysctl/debugfs/...
files accepting 1 value from shell:

  echo 42 >/proc/foo

To keep this simplest usecase simple kstrto*() functions accept
one optional newline character before mandatory NUL.
But in mount option parsing newlines aren't supposed to be.

I'll resend parse_integer() shortly which is better suited for such code
http://marc.info/?l=linux-kernel&m=142876674416451&w=4
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