linux-kernel - Re: [PATCH 09/13] tools/nolibc: sys_poll: riscv: use __NR_ppoll

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Date:   Sun, 28 May 2023 12:29:47 +0200
From:   Willy Tarreau <w@....eu>
To:     Zhangjin Wu <falcon@...ylab.org>
Cc:     arnd@...db.de, thomas@...ch.de, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-riscv@...ts.infradead.org,
        palmer@...belt.com, paul.walmsley@...ive.com
Subject: Re: [PATCH 09/13] tools/nolibc: sys_poll: riscv: use
 __NR_ppoll_time64 for rv32

Hi Zhangjin,

On Sun, May 28, 2023 at 04:25:09PM +0800, Zhangjin Wu wrote:
> Just a status update ...
> 
> I'm working on the pure time64 and 64bit off_t syscalls support, it almost
> worked (tested on rv32/64, arm32/64), thanks very much for your suggestions.
> 
> It includes:
> 
> * Based on linux/types.h and
>     * Use 64bit off_t
>     * Use 64bit time_t
>     * the new std.h looks like this
> 
>     typedef uint32_t __kernel_dev_t;
>     
>     typedef __kernel_dev_t          dev_t;
>     typedef __kernel_ulong_t        ino_t;
>     typedef __kernel_mode_t         mode_t;
>     typedef __kernel_pid_t          pid_t;
>     typedef __kernel_uid32_t        uid_t;
>     typedef __kernel_gid32_t        gid_t;
>     typedef __kernel_loff_t         off_t;
>     typedef __kernel_time64_t       time_t;
>     typedef uint32_t                nlink_t;
>     typedef uint64_t                blksize_t;
>     typedef uint64_t                blkcnt_t;
> 
> * Use __kernel_timespec as timespec
> * Use 64bit time_t based struct timeval
>     * Disable gettimeofday syscall completely for 32bit platforms
>         * And disable the gettimeofday_bad1/2 test case too

When you say "disable", you mean "remap", right ? Or do you mean
"break in 2023 code that was expected to break only in 2038 after
the hardware supporting it no longer exists" ?

Thanks,
Willy