Dynamic kernel command-line

Hello,

This is take 3 of submission, I submit this patch once in a few monthes to collect some more signatures :) Until now, I got three:
- avr32
- sh
- sh64

I know this is not one of major priorities, but it should be simple enough to be reviewed and included.

I will also be happy to get a REJECT response, so I stop trying to get it included. Any suggestions of how to push this farward will also be appreciated.

Current implementation stores a static command-line buffer allocated to COMMAND_LINE_SIZE size. Most architectures stores two copies of this buffer, one for future reference and one for parameter parsing.

Current kernel command-line size for most architecture is much too small for module parameters, video settings, initramfs paramters and much more. The problem is that setting COMMAND_LINE_SIZE to a grater value, allocates static buffers.

In order to allow a greater command-line size, these buffers should be dynamically allocated or marked as init disposable buffers, so unused memory can be released.

This patch renames the static saved_command_line variable into boot_command_line adding __initdata attribute, so that it can be disposed after initialization. This rename is required so applications that use saved_command_line will not be affected by this change.

It reintroduces saved_command_line as dynamically allocated buffer to match the data in boot_command_line.

It also mark secondary command-line buffer as __initdata, and copies it to dynamically allocated static_command_line buffer components may hold reference to it after initialization.

This patch is for linux-2.6.19 and is divided to target each architecture. I could not check this in any architecture so please forgive me if I got it wrong.

The per-architecture modification is very simple, use boot_command_line in place of saved_command_line. The common code is the change into dynamic command-line.

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