linux-kernel - Re: [PATCH] pinctrl: Avoid kasprintf/kfree

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Message-ID: <CACRpkdYxDu-vZLpc3Ef-2q1B3wpHqnuJofRwhA332Qw4pw39vg@mail.gmail.com>
Date:	Mon, 24 Feb 2014 10:49:53 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Mark Brown <broonie@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Mark Brown <broonie@...aro.org>
Subject: Re: [PATCH] pinctrl: Avoid kasprintf/kfree

On Thu, Jan 30, 2014 at 9:37 PM, Joe Perches <joe@...ches.com> wrote:

> Avoid an unnecessary allocation/free by using stack instead.
>
> Signed-off-by; Joe Perches <joe@...ches.com>

Hm.

> +       char propname[9 + sizeof(int) * 2 + 4] = "pinctrl-";

If you absolutely want to do this you have to

#define PINCTRL_PREFIX "pinctrl-"

char propname[strlen(PINCTRL_PREFIX) + sizeof(int)*2 + 4] = PINCTRL_PREFIX;

Then add a comment above stating why you add 4.

> This allocation seems unnecessary and the kasprintf isn't
> checked for non-null, so maybe this is better.

Another option would be to just add a NULL-check? This is
definately not on a performance-critical path.

Yours,
Linus Walleij
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