kexec won't --load-panic a 2.6.22 relocatable kernel?

[Vivek Goyal]

On Mon, Mar 24, 2008 at 11:22:59AM -0400, Mike Snitzer wrote:
> On Mon, Mar 24, 2008 at 10:18 AM, Mike Snitzer <snitzer at gmail.com> wrote:
> >
> > On Mon, Mar 24, 2008 at 4:29 AM, Simon Horman <horms at verge.net.au> wrote:
> >  >
> >  > On Fri, Mar 21, 2008 at 02:32:36PM +0900, Simon Horman wrote:
> >  >  > On Wed, Mar 19, 2008 at 02:05:46AM -0400, Mike Snitzer wrote:
> >  >  > > I'm building a x86_64 2.6.22 kernel with the following options set:
> >  >  > >
> >  >  > > CONFIG_KEXEC=y
> >  >  > > CONFIG_CRASH_DUMP=y
> >  >  > > CONFIG_RELOCATABLE=y
> >  >  > > CONFIG_PHYSICAL_START=0x200000
> >  >  > >
> >  >  > > If I try to load the kernel with the following I get:
> >  >  > >
> >  >  > > ./kexec --args-linux -p '--command-line=ro root=LABEL=/1 rhgb quiet
> >  >  > > irqpoll maxcpus=1' --initrd=/boot/initrd-2.6.22.19.img
> >  >  > > /boot/vmlinuz-2.6.22.19
> >  >  > >
> >  >  > > ./kexec: unrecognized option `--args-linux'
> >  >  > > kexec-tools-testing 20080318-rc released 18th March 2008
> >  >  > > Usage: kexec [OPTION]... [kernel]
> >  >  > > ...
> >  >  > > Cannot load /boot/vmlinuz-2.6.22.19
> >  >  >
> >  >  > Hi Mike,
> >  >  >
> >  >  > that looks a lot like a problem with kexec-tools parsing command line
> >  >  > arguments to me. However I'm not having much luck reproducing it here.
> >  >  > I'll poke a bit more.
> >  >  >
> >  >  > Did you get kexec-tools-testing 20080318-rc as a tarball from
> >  >  > kernel.org? I just want to make sure we are looking at the same code.
> >  >
> >  >  Sorry for being a bit slow, I have managed to reproduce the problem,
> >  >  which is that --args-linux can't be used if the image is a bzImage.
> >  >  Could you try with a vmlinux image instead?
> >
> >  Interesting, makes sense.
> >
> >  Sure enough RedHat's image is a "ELF 64-bit LSB shared object" and a
> >  vmlinux is "ELF 64-bit LSB executable".
> >
> >  I wonder how RedHat gets their kernel image to be an ELF image?
> 
> RedHat includes the following (which never made it upstream):
> http://lkml.org/lkml/2006/8/14/203
> 

Yep. Andrew Morton's one machine with lilo boot-loader did not
boot with ELF header for bzImage and we did not know what was
wrong. So above patch never made upstream.

Anyway, it was not a necessary patch though..

Thanks
Vivek