7c5ccd2dce
The idea is to calibrate the LAPIC timer just once and only on boot, given that [at present] the timer constants are global and shared between all processors. My primary motivation is to fix a panic that can happen when dynamically switching to lapic timer. The panic is caused by a recursion on et_hw_mtx when printing the calibration results to console. See the review for the details of the panic. Also, the code should become slightly simpler and easier to read. The previous code was racy too. Multiple processors could start calibrating the global constants concurrently, although that seems to have been benign. Reviewed by: kib, mav, jhb MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D15422 |
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