}
			arena.checkmarks = bitmap
		} else {
			// Otherwise clear the existing bitmap.
			clear(bitmap.b[:])
		}
	}
	// Enable checkmarking.
	useCheckmark = true
}

// endCheckmarks ends the checkmarks phase.
func endCheckmarks() {
	if gcMarkWorkAvailable(nil) {
		throw("GC work not flushed")
	}
	useCheckmark = false
}

// setCheckmark throws if marking object is a checkmarks violation,

			// concurrent mark process.
			startCheckmarks()
			gcResetMarkState()
			gcw := &getg().m.p.ptr().gcw
			gcDrain(gcw, 0)
			wbBufFlush1(getg().m.p.ptr())
			gcw.dispose()
			endCheckmarks()
		}

		// marking is complete so we can turn the write barrier off
		setGCPhase(_GCoff)
		stwSwept = gcSweep(work.mode)
	})

	mp.traceback = 0
	casgstatus(curgp, _Gwaiting, _Grunning)