On 01/21/2012 08:18 PM, Larry Finger wrote:
I recently discovered that an ancient laptop built by Mtech and containing an AMD K6 450/2 CPU was generating errors when using the Cardbus versions of Broadcom cards using either b43 of b43legacy. Expecting some change in those drivers or ssb, I found a kernel old enough to work without the error, and did a bisection. I was very surprised when "x86: merge tsc calibration", which is commit bfc0f5947afa5e3a13e55867f4478c8a92c11dca (dated July 1, 2008), turned out to be the source of the regression. It was verified by generating a reversion patch. One main difference is that the bad code gets a processor speed of 214.398 MHz, whereas reverting the commit yields 428.845 MHz, which is more in keeping with the stated frequency of 450 MHz. As the machine is more than 10 years old, the clock may have drifted considerably.
The newest kernel that was running on this laptop was 3.2-rc4. When I updated to 3.3-rc1, the problem above was fixed, thus nothing needs to be done.
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