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| author | Michael Ellerman <mpe@ellerman.id.au> | 2020-08-19 04:57:26 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-09-08 15:24:10 +0300 |
| commit | 09275d717d1b2d7d5ed91f2140bb34246514a1b4 (patch) | |
| tree | 0bb54e127e62c3834d8224fd3ef9b7d4ad2c1702 /tools/testing/selftests/powerpc/benchmarks/context_switch.c | |
| parent | 4871a10b7b5f6b0632bff229884dad1cb1e8dc37 (diff) | |
| download | linux-09275d717d1b2d7d5ed91f2140bb34246514a1b4.tar.xz | |
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 <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200819015727.1977134-8-mpe@ellerman.id.au
Diffstat (limited to 'tools/testing/selftests/powerpc/benchmarks/context_switch.c')
| -rw-r--r-- | tools/testing/selftests/powerpc/benchmarks/context_switch.c | 6 |
1 files changed, 6 insertions, 0 deletions
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"); |