From 09275d717d1b2d7d5ed91f2140bb34246514a1b4 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Wed, 19 Aug 2020 11:57:26 +1000 Subject: [PATCH] selftests/powerpc: Don't touch VMX/VSX on older CPUs If we're running on a CPU without VMX/VSX then don't touch them. This is fragile, the compiler could spill a VMX/VSX register and break the test anyway. But in practice it seems to work, ie. the test runs to completion on a system without VSX with this change. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200819015727.1977134-8-mpe@ellerman.id.au --- tools/testing/selftests/powerpc/benchmarks/context_switch.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/powerpc/benchmarks/context_switch.c b/tools/testing/selftests/powerpc/benchmarks/context_switch.c index d50cc05df495..96554e2794d1 100644 --- a/tools/testing/selftests/powerpc/benchmarks/context_switch.c +++ b/tools/testing/selftests/powerpc/benchmarks/context_switch.c @@ -481,6 +481,12 @@ int main(int argc, char *argv[]) else printf("futex"); + if (!have_hwcap(PPC_FEATURE_HAS_ALTIVEC)) + touch_altivec = 0; + + if (!have_hwcap(PPC_FEATURE_HAS_VSX)) + touch_vector = 0; + printf(" on cpus %d/%d touching FP:%s altivec:%s vector:%s vdso:%s\n", cpu1, cpu2, touch_fp ? "yes" : "no", touch_altivec ? "yes" : "no", touch_vector ? "yes" : "no", touch_vdso ? "yes" : "no");