linux-kernel - Re: [PATCH v5 3/4] x86, kdump: Change crashkernel

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Date:	Mon, 15 Apr 2013 09:20:55 +0900
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, WANG Chao <chaowang@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/4] x86, kdump: Change crashkernel_high/low= to crashkernel=,high/low

(2013/04/12 15:54), Yinghai Lu wrote:
<cut>
> Index: linux-2.6/kernel/kexec.c
> ===================================================================
> --- linux-2.6.orig/kernel/kexec.c
> +++ linux-2.6/kernel/kexec.c
> @@ -1368,35 +1368,114 @@ static int __init parse_crashkernel_simp
>   	return 0;
>   }
>   
> +#define SUFFIX_HIGH 0
> +#define SUFFIX_LOW  1
> +#define SUFFIX_NULL 2
> +static __initdata char *suffix_tbl[] = {
> +	[SUFFIX_HIGH] = ",high",
> +	[SUFFIX_LOW]  = ",low",
> +	[SUFFIX_NULL] = NULL,
> +};
> +
>   /*
> - * That function is the entry point for command line parsing and should be
> - * called from the arch-specific code.
> + * That function parses "suffix"  crashkernel command lines like
> + *
> + *	crashkernel=size,[high|low]
> + *
> + * It returns 0 on success and -EINVAL on failure.
>    */
> +static int __init parse_crashkernel_suffix(char *cmdline,
> +					   unsigned long long	*crash_size,
> +					   unsigned long long	*crash_base,
> +					   const char *suffix)
> +{
> +	char *cur = cmdline;
> +
> +	*crash_size = memparse(cmdline, &cur);
> +	if (cmdline == cur) {
> +		pr_warn("crashkernel: memory value expected\n");
> +		return -EINVAL;
> +	}
> +
> +	/* check with suffix */
> +	if (strncmp(cur, suffix, strlen(suffix))) {
> +		pr_warn("crashkernel: unrecognized char\n");
> +		return -EINVAL;
> +	}
> +	cur += strlen(suffix);
> +	if (*cur != ' ' && *cur != '\0') {
> +		pr_warn("crashkernel: unrecognized char\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}

Thanks, looks good to me.

-- 
Thanks.
HATAYAMA, Daisuke

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