Bruce Evans
94ca32a3f5
Don't switch from fast interrupt handlers to normal interrupt
handlers if interrupts are nested more than a few (3) deep. This only reduces the maximum nesting level by 1 with the standard drivers unless there is a related bug somewhere, but can't hurt much (the worst case is returning to hoggish interrupt handler like wdintr(), but such interrupt handlers hurt anyway). Fixed a previously harmless race incrementing the interrupt nesting level. This should be in 2.1.6 and 2.2.
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freebsd kernel with SKQ
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