Messages in this thread | | | Subject | Re: [PATCH -tip] x86: cpu/proc.c adding extended_cpuid_level for /proc/cpuinfo | From | Andi Kleen <> | Date | Wed, 13 May 2009 10:03:39 +0200 |
| |
Andrew Morton <akpm@linux-foundation.org> writes:
> On Tue, 12 May 2009 12:44:42 +0530 Jaswinder Singh Rajput <jaswinder@kernel.org> wrote: > >> + "ext cpuid level\t: 0x%x\n" > > It's unobvious what "ext" means. External? > > Can we make it "extended cpuid level"? > > One would hope that google(extended cpuid level) tells you what an > extended cpuid level is, but alas, unclear.
AMD has an own cpuid range in 0x8000_0000+. But it's only useful if you actually access it using cpuid. Everyone who needs it already needs to call cpuid and if they do that they can as well retrieve it by themselves.
Without accessing CPUID it has no value at whatsoever. It would also seem pretty dumb to spend a few thousand cycles getting it from the kernel when you can as well get it directly from CPUID and you need to have that code anyways.
The useful information in 8000_0000+ is all reported by the kernel anyways.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
| |