Commit 314ff527 authored Jul 27, 2011 by David S. Miller

sparc: Don't do expensive hypervisor PCR write unless necessary.



The hypervisor call is only necessary if hypervisor events are
being requested.

So if we're not tracking hypervisor events, simply do a direct
register write.

Signed-off-by: David S. Miller <davem@davemloft.net>

parent 15e3608d

arch/sparc/kernel/pcr.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -80,9 +80,12 @@ static void n2_pcr_write(u64 val)
		{
		unsigned long ret;

		if (val & PCR_N2_HTRACE) {
		ret = sun4v_niagara2_setperf(HV_N2_PERF_SPARC_CTL, val);
		if (ret != HV_EOK)
		write_pcr(val);
		} else
		write_pcr(val);
		}

		static const struct pcr_ops n2_pcr_ops = {