linux-kernel - Re: [PATCH 04/13] selftests/nolibc: syscall_args: use __NR

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Date:   Fri, 26 May 2023 11:21:02 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Zhangjin Wu" <falcon@...ylab.org>, "Willy Tarreau" <w@....eu>
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        "Palmer Dabbelt" <palmer@...belt.com>,
        "Paul Walmsley" <paul.walmsley@...ive.com>, thomas@...ch.de
Subject: Re: [PATCH 04/13] selftests/nolibc: syscall_args: use __NR_statx for rv32

On Wed, May 24, 2023, at 19:48, Zhangjin Wu wrote:

> 
> +static int test_syscall_args(void)
> +{
> +#ifdef __NR_fstat
> +	return syscall(__NR_fstat, 0, NULL);
> +#elif defined(__NR_statx)
> +	return syscall(__NR_statx, 0, NULL, 0, 0, NULL);
> +#else
> +#error Neither __NR_fstat nor __NR_statx defined, cannot implement 
> syscall_args test
> +#endif
> +}

Does this need to work on old kernels? My impression was that
this is only intended to be used with the kernel that ships the
copy, so you can just rely on statx to be defined and drop
the old fallbacks (same as for pselect6_time64 as I commented).

      Arnd