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Use npxdrop in cpu_thread_exit to save some cycles.

Description

Use npxdrop in cpu_thread_exit to save some cycles.
Clear FPU pcb flags for new upcall thread, these flags needn't
be inherited, the new thread should start from clean FPU status.

Details

Provenance
David Xu <davidxu@FreeBSD.org>Authored on Oct 19 2003, 12:57 AM
Parents
rG93227805ffb6: Before trying to restart/stop the MTA or MSP queue runner, make sure
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