linux-kernel - Re: [PATCH 01/28] c6x: use boot_command_line instead of private c6x_command

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Message-ID: <1379511332.1817.45.camel@deneb.redhat.com>
Date:	Wed, 18 Sep 2013 09:35:32 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Aurelien Jacquiot <a-jacquiot@...com>,
	linux-c6x-dev@...ux-c6x.org
Subject: Re: [PATCH 01/28] c6x: use boot_command_line instead of private
 c6x_command_line

On Mon, 2013-09-16 at 18:08 -0500, Rob Herring wrote:
> From: Rob Herring <rob.herring@...xeda.com>
> 
> Save some pointless copying of the kernel command line and just use
> boot_command_line instead.
> 
> Also remove default_command_line as it is not referenced anywhere, and
> the DT code already handles the default command line.
> 

The default_command_line is leftover cruft from the kernel before it was
upstreamed. It was a mechanism to place the commandline at a known fixed
offset in the Image. It was needed for simple (serial eeprom based)
loaders which didn't know about DT. Anyway, bits of that support are
missing, so I don't see a reason to keep it around. If anyone complains
we can add it back in as a completely functional patch. There is also
a fragment of arch/c6x/kernel/vmlinux.lds.S which should also be
removed:

diff --git a/arch/c6x/kernel/vmlinux.lds.S b/arch/c6x/kernel/vmlinux.lds.S
index 279d807..5a6e141 100644
--- a/arch/c6x/kernel/vmlinux.lds.S
+++ b/arch/c6x/kernel/vmlinux.lds.S
@@ -37,12 +37,6 @@ SECTIONS
 		_vectors_end = .;
 	}
 
-	. = ALIGN(0x1000);
-	.cmdline :
-	{
-		*(.cmdline)
-	}
-
 	/*
 	 * This section contains data which may be shared with other
 	 * cores. It needs to be a fixed offset from PAGE_OFFSET


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