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Alexander Leidinger
2cfd82f747
Exercise a process-mode counting PMC whose accumulated count crosses, or already exceeds, the range of the underlying hardware counter. Before the previous commit, the first context switch after the hardware counter wrapped panicked INVARIANTS kernels with "negative increment" and silently corrupted the accumulated count on other kernels. The tests need a hardware counting event backed by a counter narrower than 64 bits and skip where none is available (hwpmc(4) not loaded, or a VM without a vPMU). Reviewed by: adrian MFC after: 2 weeks Assisted-by: Claude Code (Fable 5) Differential Revision: https://reviews.freebsd.org/D58341