Re: [patch 2.4 1/2] backport 2.6 x86 cpu capabilities
From: Jeff Garzik
Date: Fri Aug 08 2003 - 08:20:02 EST
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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