Re: [PATCH] riscv: compat: make __ARCH_WANT_COMPAT_FADVISE64_64 conditional

[Arnd Bergmann]

On Sun, Aug 7, 2022 at 7:28 PM Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
>
> When CONFIG_ADVISE_SYSCALLS is not set/enabled and CONFIG_COMPAT is
> set/enabled, the riscv compat_syscall_table references
> 'compat_sys_fadvise64_64', which is not defined:
>
> riscv64-linux-ld: arch/riscv/kernel/compat_syscall_table.o:(.rodata+0x6f8):
> undefined reference to `compat_sys_fadvise64_64'
>
> Only set __ARCH_WANT_COMPAT_FADVISE64_64 when CONFIG_ADVISE_SYSCALLS
> is set.
>
> Fixes: 59c10c52f573 ("riscv: compat: syscall: Add compat_sys_call_table implementation")
> Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
> Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
> Cc: linux-riscv@xxxxxxxxxxxxxxxxxxx
> Cc: Guo Ren <guoren@xxxxxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> ---
>  arch/riscv/include/asm/unistd.h |    2 ++
>  1 file changed, 2 insertions(+)
>
> --- a/arch/riscv/include/asm/unistd.h
> +++ b/arch/riscv/include/asm/unistd.h
> @@ -18,8 +18,10 @@
>  #define __ARCH_WANT_COMPAT_PWRITE64
>  #define __ARCH_WANT_COMPAT_SYNC_FILE_RANGE
>  #define __ARCH_WANT_COMPAT_READAHEAD
> +#ifdef CONFIG_ADVISE_SYSCALLS
>  #define __ARCH_WANT_COMPAT_FADVISE64_64
>  #endif
> +#endif

I think it's better to add this to kernel/sys_ni.c next to
COND_SYSCALL(fadvise64_64), to make it more consistent
with the other conditionally enabled syscalls.

        Arnd