x86: quick TSC calibration, improve



- make sure the final TSC timestamp is reliable too

Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 6ac40ed0

arch/x86/kernel/tsc.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -316,6 +316,12 @@ static unsigned long quick_pit_calibrate(void)
		}
		t2 = get_cycles();

		/*
		* Make sure we can rely on the second TSC timestamp:
		*/
		if (!pit_expect_msb(--expect))
		goto failed;

		/*
		* Ok, if we get here, then we've seen the
		* MSB of the PIT decrement QUICK_PIT_ITERATIONS