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