linux-kernel - Re: [PATCH v3 11/15] livepatch: use kstrtobool() in enabled

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Date:   Fri, 16 Dec 2016 17:55:55 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Jessica Yu <jeyu@...hat.com>, Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        Vojtech Pavlik <vojtech@...e.com>, Jiri Slaby <jslaby@...e.cz>,
        Chris J Arges <chris.j.arges@...onical.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 11/15] livepatch: use kstrtobool() in enabled_store()

On Thu 2016-12-08 12:08:36, Josh Poimboeuf wrote:
> The sysfs enabled value is a boolean, so kstrtobool() is a better fit
> for parsing the input string since it does the range checking for us.
> 
> Suggested-by: Petr Mladek <pmladek@...e.com>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  kernel/livepatch/core.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index 6a137e1..8ca8a0e 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -408,26 +408,23 @@ static ssize_t enabled_store(struct kobject *kobj, struct kobj_attribute *attr,
>  {
>  	struct klp_patch *patch;
>  	int ret;
> -	unsigned long val;
> +	bool enabled;
>  
> -	ret = kstrtoul(buf, 10, &val);
> +	ret = kstrtobool(buf, &enabled);
>  	if (ret)
>  		return -EINVAL;

I would return "ret" here. It is -EINVAL as well but... ;-)

Anyway, feel free to use:

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr