linux-kernel - Re: [PATCH 2/2] selftests/nolibc: add sizeof test for the new 64bit data types

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Date:   Tue, 30 May 2023 11:18:45 +0200
From:   Thomas Weißschuh <thomas@...ch.de>
To:     Zhangjin Wu <falcon@...ylab.org>
Cc:     w@....eu, arnd@...db.de, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 2/2] selftests/nolibc: add sizeof test for the new 64bit
 data types

On 2023-05-30 14:42:56+0800, Zhangjin Wu wrote:
> These test cases are required to make sure the new added data types are
> really 64bit based.
> 
> Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
> ---
>  tools/testing/selftests/nolibc/nolibc-test.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
> index 20d184da9a2b..43ce4d34b596 100644
> --- a/tools/testing/selftests/nolibc/nolibc-test.c
> +++ b/tools/testing/selftests/nolibc/nolibc-test.c
> @@ -721,6 +721,14 @@ int run_stdlib(int min, int max)
>  #else
>  # warning "__SIZEOF_LONG__ is undefined"
>  #endif /* __SIZEOF_LONG__ */
> +		CASE_TEST(sizeof_time_t);           EXPECT_EQ(1, 8,                sizeof(time_t)); break;
> +		CASE_TEST(sizeof_timespec);         EXPECT_EQ(1, 16,               sizeof(struct timespec)); break;
> +#ifdef NOLIBC
> +		CASE_TEST(sizeof_itimerspec);       EXPECT_EQ(1, 32,               sizeof(struct itimerspec)); break;
> +#endif
> +		CASE_TEST(sizeof_timeval);          EXPECT_EQ(1, 16,               sizeof(struct timeval)); break;
> +		CASE_TEST(sizeof_itimerval);        EXPECT_EQ(1, 32,               sizeof(struct itimerval)); break;
> +		CASE_TEST(sizeof_off_t);            EXPECT_EQ(1, 8,                sizeof(off_t)); break;

These will break on 32bit glibc configurations.
(At least on x86)

>  		case __LINE__:
>  			return ret; /* must be last */
>  		/* note: do not set any defaults so as to permit holes above */
> -- 
> 2.25.1
>