Commit 5d7ead00 authored Jul 13, 2013 by Michael Ellerman Committed by Benjamin Herrenschmidt Jul 24, 2013

powerpc/perf: Set PPC_FEATURE2_EBB when we register the power8 PMU



The presence or absence of EBB is advertised to userspace via the presence
or absence of PPC_FEATURE2_EBB in cpu_user_features2.

Because the kernel can be built without PMU support, we should only add
PPC_FEATURE2_EBB to cpu_user_features2 when we successfully register the
power8 PMU support.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent 97645154

arch/powerpc/perf/power8-pmu.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -621,10 +621,19 @@ static struct power_pmu power8_pmu = {

		static int __init init_power8_pmu(void)
		{
		int rc;

		if (!cur_cpu_spec->oprofile_cpu_type \|\|
		strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8"))
		return -ENODEV;

		return register_power_pmu(&power8_pmu);
		rc = register_power_pmu(&power8_pmu);
		if (rc)
		return rc;

		/* Tell userspace that EBB is supported */
		cur_cpu_spec->cpu_user_features2 \|= PPC_FEATURE2_EBB;

		return 0;
		}
		early_initcall(init_power8_pmu);