linux-kernel - Re: [PATCH] selftests/vDSO: fix ABI selftest on riscv

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Date:   Thu, 04 Feb 2021 23:06:37 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     tklauser@...tanz.ch, shuah@...nel.org
CC:     Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
        vincenzo.frascino@....com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject:     Re: [PATCH] selftests/vDSO: fix ABI selftest on riscv

On Thu, 04 Feb 2021 06:50:42 PST (-0800), tklauser@...tanz.ch wrote:
> Only older versions of the RISC-V GCC toolchain define __riscv__. Check
> for __riscv as well, which is used by newer GCC toolchains. Also set
> VDSO_32BIT based on __riscv_xlen.
>
> Before (on riscv64):
>
> $ ./vdso_test_abi
> [vDSO kselftest] VDSO_VERSION: LINUX_4
> Could not find __vdso_gettimeofday
> Could not find __vdso_clock_gettime
> Could not find __vdso_clock_getres
> clock_id: CLOCK_REALTIME [PASS]
> Could not find __vdso_clock_gettime
> Could not find __vdso_clock_getres
> clock_id: CLOCK_BOOTTIME [PASS]
> Could not find __vdso_clock_gettime
> Could not find __vdso_clock_getres
> clock_id: CLOCK_TAI [PASS]
> Could not find __vdso_clock_gettime
> Could not find __vdso_clock_getres
> clock_id: CLOCK_REALTIME_COARSE [PASS]
> Could not find __vdso_clock_gettime
> Could not find __vdso_clock_getres
> clock_id: CLOCK_MONOTONIC [PASS]
> Could not find __vdso_clock_gettime
> Could not find __vdso_clock_getres
> clock_id: CLOCK_MONOTONIC_RAW [PASS]
> Could not find __vdso_clock_gettime
> Could not find __vdso_clock_getres
> clock_id: CLOCK_MONOTONIC_COARSE [PASS]
> Could not find __vdso_time
>
> After (on riscv32):
>
> $ ./vdso_test_abi
> [vDSO kselftest] VDSO_VERSION: LINUX_4.15
> The time is 1612449376.015086
> The time is 1612449376.18340784
> The resolution is 0 1
> clock_id: CLOCK_REALTIME [PASS]
> The time is 774.842586182
> The resolution is 0 1
> clock_id: CLOCK_BOOTTIME [PASS]
> The time is 1612449376.22536565
> The resolution is 0 1
> clock_id: CLOCK_TAI [PASS]
> The time is 1612449376.20885172
> The resolution is 0 4000000
> clock_id: CLOCK_REALTIME_COARSE [PASS]
> The time is 774.845491269
> The resolution is 0 1
> clock_id: CLOCK_MONOTONIC [PASS]
> The time is 774.849534200
> The resolution is 0 1
> clock_id: CLOCK_MONOTONIC_RAW [PASS]
> The time is 774.842139684
> The resolution is 0 4000000
> clock_id: CLOCK_MONOTONIC_COARSE [PASS]
> Could not find __vdso_time
>
> Signed-off-by: Tobias Klauser <tklauser@...tanz.ch>
> ---
>  tools/testing/selftests/vDSO/vdso_config.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/vDSO/vdso_config.h b/tools/testing/selftests/vDSO/vdso_config.h
> index 6a6fe8d4ff55..6188b16827d1 100644
> --- a/tools/testing/selftests/vDSO/vdso_config.h
> +++ b/tools/testing/selftests/vDSO/vdso_config.h
> @@ -47,10 +47,12 @@
>  #elif defined(__x86_64__)
>  #define VDSO_VERSION		0
>  #define VDSO_NAMES		1
> -#elif defined(__riscv__)
> +#elif defined(__riscv__) || defined(__riscv)
>  #define VDSO_VERSION		5
>  #define VDSO_NAMES		1
> +#if __riscv_xlen == 32
>  #define VDSO_32BIT		1
> +#endif
>  #else /* nds32 */
>  #define VDSO_VERSION		4
>  #define VDSO_NAMES		1

Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>

Not sure if you want this through the RISC-V tree, so I'm leaving it out for
now and assuming it'll go through a kselftest tree.

Thanks!