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SubjectRe: [ANNOUNCE] HotPlug CPU patch against 2.5.0

As you mentioned, CPU online caused panic when MTRR was on
on my system. I've only tested with no MTRR configuration. :-(
I'll investigate the problem but I'm not sure I can find
a resolution. (I know nothing about MTRR... )
Does anybody have an idea for the problem?


On Tue, 18 Dec 2001 18:29:30 -0800 (PST)
"Randy.Dunlap" <> wrote:

> Hi,
> I applied this patch to Linux 2.5.0 and tried to use it on
> a 2-way x86 system with dual Intel Pentium III's (1 GHz).
> Results:
> echo 0 > /proc/sys/kernel/cpu/1/online
> seems to work: "top" stops reporting about the second CPU.
> However,
> echo 1 > /proc/sys/kernel/cpu/1/online
> results in an Oops in set_mtrr_var_range_testing().
> (same oops that I had encountered when I ported the 2.4.5
> patch to 2.4.13)
> Does this work for you? I can connect a serial console to
> it and provide you with a complete oops report if you want
> that, and I'm available to help work on it.
> In linux/arch/i386/kernel/mtrr.c, the functions
> set_mtrr_var_range_testing() and
> set_mtrr_fixed_testing()
> need to have the "__init" removed from them, but this
> doesn't fix the oops problem.
> Thanks,
> --
> ~Randy

Kimio Suganuma <>

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