RFC: let x86_64 no longer define X86

[Adrian Bunk <bunk@stusta.de>]

I'd like to send a patch after 2.6.10 that removes the following from 
arch/x86_64/Kconfig:

  config X86
        bool
        default y

Additionally, I'll also check all current X86 uses to prevent breakages.


Why?

X86 is _the_ symbol to identify the i386 architecture, but the x86_64 
port hijacked it. Kernel-wise, x86_64 is mostly simply a new port like 
e.g. ia64.


Where is the problem?

To say "X86", you currently have to write "(X86 && !X86_64)" in the 
Kconfig file. This is not intuitive.

Why is e.g. CONFIG_LBD available on x86_64 and even enabled in 
defconfig?


Isn't this an incompatible change?

Yes it is.
But according to the current development model, such changes are allowed 
in 2.6 .

And if you want to support both older and more recent kernels, the 
following dependencies will be correct both before and after this 
change:
- (X86 && !X86_64)
- (X86 && X86_64)


cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed