[PATCH v2 2/4] kselftest/arm64: Validate vector lengths are set in sve-probe-vls

[Dave Martin]

On Wed, Jul 28, 2021 at 05:33:16PM +0100, Mark Brown wrote:
> Currently sve-probe-vls does not verify that the vector lengths reported
> by the prctl() interface are actually what is reported by the architecture,
> use the rdvl_sve() helper to validate this.
> 
> Signed-off-by: Mark Brown <broonie at kernel.org>

Reviewed-by: Dave Martin <Dave.Martin at arm.com>

> ---
>  tools/testing/selftests/arm64/fp/Makefile        | 2 +-
>  tools/testing/selftests/arm64/fp/sve-probe-vls.c | 5 +++++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/arm64/fp/Makefile b/tools/testing/selftests/arm64/fp/Makefile
> index ed62e7003b96..fa3a0167db2d 100644
> --- a/tools/testing/selftests/arm64/fp/Makefile
> +++ b/tools/testing/selftests/arm64/fp/Makefile
> @@ -13,7 +13,7 @@ fpsimd-test: fpsimd-test.o
>  	$(CC) -nostdlib $^ -o $@
>  rdvl-sve: rdvl-sve.o rdvl.o
>  sve-ptrace: sve-ptrace.o sve-ptrace-asm.o
> -sve-probe-vls: sve-probe-vls.o
> +sve-probe-vls: sve-probe-vls.o rdvl.o
>  sve-test: sve-test.o
>  	$(CC) -nostdlib $^ -o $@
>  vlset: vlset.o
> diff --git a/tools/testing/selftests/arm64/fp/sve-probe-vls.c b/tools/testing/selftests/arm64/fp/sve-probe-vls.c
> index 76e138525d55..a24eca7a4ecb 100644
> --- a/tools/testing/selftests/arm64/fp/sve-probe-vls.c
> +++ b/tools/testing/selftests/arm64/fp/sve-probe-vls.c
> @@ -13,6 +13,7 @@
>  #include <asm/sigcontext.h>
>  
>  #include "../../kselftest.h"
> +#include "rdvl.h"
>  
>  int main(int argc, char **argv)
>  {
> @@ -38,6 +39,10 @@ int main(int argc, char **argv)
>  
>  		vl &= PR_SVE_VL_LEN_MASK;
>  
> +		if (rdvl_sve() != vl)
> +			ksft_exit_fail_msg("PR_SVE_SET_VL reports %d, RDVL %d\n",
> +					   vl, rdvl_sve());
> +
>  		if (!sve_vl_valid(vl))
>  			ksft_exit_fail_msg("VL %d invalid\n", vl);
>  		vq = sve_vq_from_vl(vl);
> -- 
> 2.20.1
> 
> 
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