Re: COMMAND_LINE_SIZE increasing in 2.6.11-rc1-bk6

[Eric W. Biederman]

Werner Almesberger <wa@xxxxxxxxxxxxxxx> writes:

> Andi Kleen wrote:
> > It's dependent on the architecture already. I would like to enable
> > it on i386/x86-64 because the kernel command line is often used
> > to pass parameters to installers, and having a small limit there
> > can be awkward.
> 
> Something to keep in mind when extending the command line is that
> we'll probably need a mechanism for passing additional (and
> possibly large) data blocks from the boot loader soon.
> 
> The reason for this is that, if booting through kexec, it would be
> attractive to pass device scan results, so that the second kernel
> doesn't have to repeat the work. As an obvious extension, anyone
> who wants to boot *quickly* could also pass such data from
> persistent storage without actually performing the device scan at
> all when the machine is booted.
> 
> The command line may be suitable for this, but to allow for passing
> a lot of data, its place in memory should perhaps just be reserved,
> at least until the system has passed initialization, without trying
> to copy it to a "safe" place early in kernel startup.

Actually this is trivial to do by using a file in initramfs.
If we need something in a well defined format anyway.

Eric
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