Kexec command line length

Bernhard Walle bwalle at
Thu Jan 31 02:16:25 EST 2008

* Vivek Goyal <vgoyal at> [2008-01-30 22:45]:
> No. 2.04 is really old. As per boot.txt, it was introduced in 2.6.14.
> Anyway, thinking about it more, Large command lines were introduced in
> 2.6.21 kernel (for both i386 and x86_64). cmdline_size was introduced
> in 2.6.22 (for both i386 and x86_64). So how about following test
> condition for both the arch.
> if (boot_protocol >= 2.06)
> 	error message based on cmdline_size field
> else
> 	Warn user if command line is more than 256 but continue to work.
>   	Let the user know that it is not known if kernel being loaded
> 	supports command line size greater than 256. Command line will
> 	be truncated by destination kernel if it does not support large
> 	command lines. User is taking a chance

Yes, I also think that's sufficient.


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