From: Michael Ellerman <michael@ellerman.id.au>
To: <linuxppc-dev@ozlabs.org>
Cc: azanella@linux.vnet.ibm.com
Subject: [PATCH] powerpc/perf: Set PPC_FEATURE2_EBB when we register the power8 PMU
Date: Sat, 13 Jul 2013 12:53:40 +1000 [thread overview]
Message-ID: <1373684020-19203-1-git-send-email-michael@ellerman.id.au> (raw)
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>
---
arch/powerpc/perf/power8-pmu.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/perf/power8-pmu.c b/arch/powerpc/perf/power8-pmu.c
index 96a64d6..09def19 100644
--- a/arch/powerpc/perf/power8-pmu.c
+++ b/arch/powerpc/perf/power8-pmu.c
@@ -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);
--
1.7.10.4
reply other threads:[~2013-07-13 2:53 UTC|newest]
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