linux-kernel - Re: [RFC][PATCH] x86: introduce parse_early_param_alone() to parse param early (Was Re: linux-next: reservetop fix disables mem= )

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Message-ID: <4A9F5C74.1040805@cn.fujitsu.com>
Date:	Thu, 03 Sep 2009 14:04:36 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Zachary Amsden <zach@...are.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] x86: introduce parse_early_param_alone() to parse
 param early (Was Re: linux-next: reservetop fix disables mem= )



Américo Wang wrote:

>> +#ifdef CONFIG_CMDLINE_BOOL
>> +#ifdef CONFIG_CMDLINE_OVERRIDE
>> +	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> +#else
>> +	if (builtin_cmdline[0]) {
>> +		/* append boot loader cmdline to builtin */
>> +		strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
>> +		strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
>> +		strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> +	}
>> +#endif
>> +#endif
> 
> 
> This seems ugly.
> 
> CMDLINE_OVERRIDE depends on CMDLINE_BOOL, right? So the outer #ifdef
> can be removed. :)
> 

Thanks for your review, but I think we can't do that.

Yeah, CMDLINE_OVERRIDE depends on CMDLINE_BOOL, but we don't know whether 
CONFIG_CMDLINE_BOOL is defined if CONFIG_CMDLINE_OVERRIDE is not defined,
like below:

#ifdef CONFIG_CMDLINE_OVERRIDE
	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
#else
	/* There have two cases:
	 * 1: if CONFIG_CMDLINE_BOOL is defined, it's OK 
	 * 2: if CONFIG_CMDLINE_BOOL is not defined, builtin_cmdline
	 * is not defined, so, the compiler will complain with it
	 */
	if (builtin_cmdline[0]) {
		/* append boot loader cmdline to builtin */
		strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
		strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
		strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
	}
#endif

Thanks,
Xiao

> 
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