linux-kernel - Re: [PATCH-RFC 5/7] arm: convert to generic builtin command line

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Date:	Tue, 20 Oct 2015 12:54:52 -0700
From:	Daniel Walker <danielwa@...co.com>
To:	Rob Herring <robh@...nel.org>
Cc:	xe-kernel@...ernal.cisco.com,
	Russell King <linux@....linux.org.uk>,
	Daniel Walker <dwalker@...o99.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH-RFC 5/7] arm: convert to generic builtin command line

On 10/07/2015 02:48 PM, Rob Herring wrote:
>>   #ifndef MEM_SIZE
>> >  #define MEM_SIZE       (16*1024*1024)
>> >@@ -125,16 +126,9 @@ __tagtable(ATAG_REVISION, parse_tag_revision);
>> >
>> >  static int __init parse_tag_cmdline(const struct tag *tag)
>> >  {
>> >-#if defined(CONFIG_CMDLINE_EXTEND)
>> >-       strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
>> >         strlcat(default_command_line, tag->u.cmdline.cmdline,
>> >                 COMMAND_LINE_SIZE);
> Just do this here:
>
> cmdline_add_builtin(boot_command_line, tag->u.cmdline.cmdline,
> COMMAND_LINE_SIZE);
>
> and remove everything from setup_machine_tags.
>
> Also, I don't think there is any reason to have cmd_line and copy
> boot_command_line to it in setup.c.
>

I don't think this function runs if there's no cmdline atag, so if the 
code is here then without a atag for cmdline you wouldn't get the 
builtin command line either which I don't think make sense. We should 
get the builtin regardless of this atag appearing, or if there's a DT 
bootargs.

Daniel
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