Re: Patch to make the head.S-must-be-first-in-vmlinux order explicit

[Arjan van de Ven <arjan@linux.intel.com>]

Eric W. Biederman wrote:
> Andi Kleen <ak@suse.de> writes:
> 
>> On Thursday 23 February 2006 14:57, Arjan van de Ven wrote:
>>
>>>> (or at least
>>>> it shouldn't), but arch/x86_64/boot/compressed/head.S
>>>> seems to have the entry address hardcoded. Perhaps you can just change this
>>>> to pass in the right address?
>>> the issue is that the address will be a link time thing, which means 
>>> lots of complexity.
>> bzImage image should be only generated after vmlinux is done 
>> and then the address should be available with a simple grep in System.map
> 
> Andi it is more than that.  At least it was last I payed attention.
> There are symbols like stext that various things depend on being early,
> at least last time I looked.  So while it is doable it requires some
> careful looking.

_stext and such are very easy. That is actually not a real variable just 
a linker script thing, and since the reordering works on the linker 
script level that's already taken care of ;-)

I've looked some yesterday at generating this at runtime, and haven't 
found a clean enough solution yet (esp one that doesn't break kdump); 
I'll keep poking at it for a bit more though....