x86: warn of incorrect cpu_khz on AMD systems

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Impact: add debug check

If none of the perfctrs are free when calculating cpu_khz we default to
using ctr 3 (ie, we just choose 3).  This may lead to an incorrect tsc
freq value which can cause the system to be unstable.

To aid in future debugging, WARN the user of a potential problem.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Prarit Bhargava 2008-11-12 13:35:00 -05:00 • committed by Ingo Molnar

parent 6cf87efbc7

commit 8652cb4b0d

1 changed files with 2 additions and 0 deletions

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arch/x86/kernel/time_64.c

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