Re: [PATCH V6 11/20] riscv: compat: syscall: Add compat_sys_call_table implementation

Guo Ren
2022-02-24T10:30:48Z

On Thu, Feb 24, 2022 at 5:38 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Thu, Feb 24, 2022 at 9:54 AM <guoren@kernel.org> wrote:
> >
> > From: Guo Ren <guoren@linux.alibaba.com>
> >
> > Implement compat sys_call_table and some system call functions:
> > truncate64, ftruncate64, fallocate, pread64, pwrite64,
> > sync_file_range, readahead, fadvise64_64 which need argument
> > translation.
> >
> > Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> > Signed-off-by: Guo Ren <guoren@kernel.org>
> > Cc: Arnd Bergmann <arnd@arndb.de>
> > Cc: Palmer Dabbelt <palmer@dabbelt.com>
>
> Here, I was hoping you'd convert some of the other architectures to use
> the same code, but the changes you did do look correct.
>
> Please at least add the missing bit for big-endian architectures here:
>
> +#if !defined(compat_arg_u64) && !defined(CONFIG_CPU_BIG_ENDIAN)
> +#define compat_arg_u64(name) u32 name##_lo, u32 name##_hi
> +#define compat_arg_u64_dual(name) u32, name##_lo, u32, name##_hi
> +#define compat_arg_u64_glue(name) (((u64)name##_hi << 32) | \
> + ((u64)name##_lo & 0xffffffffUL))
> +#endif
>
> with the lo/hi words swapped. With that change:
Got it, I would change it in next version of patch.

>
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>

--
Best Regards
Guo Ren

ML: https://lore.kernel.org/linux-csky/