Re: [patch 2.4 1/2] backport 2.6 x86 cpu capabilities

[Jeff Garzik]

Mikael Pettersson wrote:
> On Thu, 7 Aug 2003 22:54:30 -0400, Jeff Garzik wrote:
>
> > (hopefully destined for 2.4.23-pre1)
> >
> > #
> > #	include/asm-i386/msr.h	1.8     -> 1.9    
> > #	include/asm-i386/cpufeature.h	1.5     -> 1.6    
> > #	arch/i386/kernel/setup.c	1.70    -> 1.71   
> > #
>
> ...
>
> > -#define NCAPINTS	4	/* Currently we have 4 32-bit words worth of info */
> > +#define NCAPINTS	6	/* Currently we have 6 32-bit words worth of info */
>
>
> If you change NCAPINTS you also have to change the hardcoded
> struct offset X86_VENDOR_ID in arch/i386/kernel/head.S. Otherwise
> nasty stuff happen at boot since boot_cpu_data gets broken.


hmmm, reality doesn't seem to bear that out...  I made the same change 
to 2.6, without touching head.S, and life continues without "nasty 
stuff" AFAICS.

Do both 2.4 and 2.6 need this change?  And, why didn't 2.6 break?

	Jeff



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