Re: [PATCH 10/15] csky, hexagon: fix broken sys_sync_file_range

[Guo Ren <guoren@kernel.org>]

On Fri, Jun 21, 2024 at 12:24 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> Both of these architectures require u64 function arguments to be
> passed in even/odd pairs of registers or stack slots, which in case of
> sync_file_range would result in a seven-argument system call that is
> not currently possible. The system call is therefore incompatible with
> all existing binaries.
>
> While it would be possible to implement support for seven arguments
> like on mips, it seems better to use a six-argument version, either
> with the normal argument order but misaligned as on most architectures
> or with the reordered sync_file_range2() calling conventions as on
> arm and powerpc.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/csky/include/uapi/asm/unistd.h    | 1 +
>  arch/hexagon/include/uapi/asm/unistd.h | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/arch/csky/include/uapi/asm/unistd.h b/arch/csky/include/uapi/asm/unistd.h
> index 7ff6a2466af1..e0594b6370a6 100644
> --- a/arch/csky/include/uapi/asm/unistd.h
> +++ b/arch/csky/include/uapi/asm/unistd.h
> @@ -6,6 +6,7 @@
>  #define __ARCH_WANT_SYS_CLONE3
>  #define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_TIME32_SYSCALLS
> +#define __ARCH_WANT_SYNC_FILE_RANGE2
For csky part.
Acked-by: Guo Ren <guoren@kernel.org>

>  #include <asm-generic/unistd.h>
>
>  #define __NR_set_thread_area   (__NR_arch_specific_syscall + 0)
> diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h
> index 432c4db1b623..21ae22306b5d 100644
> --- a/arch/hexagon/include/uapi/asm/unistd.h
> +++ b/arch/hexagon/include/uapi/asm/unistd.h
> @@ -36,5 +36,6 @@
>  #define __ARCH_WANT_SYS_VFORK
>  #define __ARCH_WANT_SYS_FORK
>  #define __ARCH_WANT_TIME32_SYSCALLS
> +#define __ARCH_WANT_SYNC_FILE_RANGE2
>
>  #include <asm-generic/unistd.h>
> --
> 2.39.2
>


-- 
Best Regards
 Guo Ren