linux-kernel - Re: [PATCH] x86: kernel/early_printk.c simple

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Date:	Sun, 27 May 2012 13:51:12 -0700
From:	Joe Perches <joe@...ches.com>
To:	shuahkhan@...il.com
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: kernel/early_printk.c simple_strtoul cleanup

On Sun, 2012-05-27 at 10:48 -0600, Shuah Khan wrote:
> Change early_serial_init() to call kstrtoul() instead of calling obsoleted
> simple_strtoul().
[]
> diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
[]
> @@ -119,22 +119,27 @@ static __init void early_serial_init(char *s)
>  	unsigned char c;
>  	unsigned divisor;
>  	unsigned baud = DEFAULT_BAUD;
> -	char *e;
> +	unsigned long val;
> +	ssize_t ret;
>  
>  	if (*s == ',')
>  		++s;
>  
>  	if (*s) {
> -		unsigned port;
> +		unsigned port = 0;
>  		if (!strncmp(s, "0x", 2)) {
> -			early_serial_base = simple_strtoul(s, &e, 16);
> +			ret = kstrtoul(s, 16, &val);
> +			if (!ret)
> +				early_serial_base = val;

I believe none of the kstrto<foo> calls set
the value in the pointer unless successful so
you don't need a temporary and can simply use:

		ret = kstrtoint(s, 16, &early_serial_base)
		if (ret)

etc...


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