[PATCH v2] kernel/sys_ni: add compat entry for fadvise64_64

[Conor.Dooley at microchip.com]

On 07/08/2022 23:09, Randy Dunlap 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'
> 
> Add 'fadvise64_64' to kernel/sys_ni.c as a conditional COMPAT function
> so that when CONFIG_ADVISE_SYSCALLS is not set, there is a fallback
> function available.

Is this in a 6.0 destined tree somewhere that I've missed?
Bumped into it while looking at an unrelated LKP randconfig error.
FWIW:
Tested-by: Conor Dooley <conor.dooley at microchip.com>
Thanks,
Conor.

> 
> Fixes: d3ac21cacc24 ("mm: Support compiling out madvise and fadvise")
> Signed-off-by: Randy Dunlap <rdunlap at infradead.org>
> Suggested-by: Arnd Bergmann <arnd at arndb.de>
> Cc: Josh Triplett <josh at joshtriplett.org>
> Cc: Paul Walmsley <paul.walmsley at sifive.com>
> Cc: Palmer Dabbelt <palmer at dabbelt.com>
> Cc: Albert Ou <aou at eecs.berkeley.edu>
> Cc: linux-riscv at lists.infradead.org
> Cc: Arnd Bergmann <arnd at arndb.de>
> Cc: linux-api at vger.kernel.org
> Cc: Andrew Morton <akpm at linux-foundation.org>
> Cc: linux-mm at kvack.org
> ---
> v2: patch kernel/sys_ni.c (for any arch) instead of arch/riscv's
>     unistd.h (Arnd)
> 
>  kernel/sys_ni.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> --- a/kernel/sys_ni.c
> +++ b/kernel/sys_ni.c
> @@ -277,6 +277,7 @@ COND_SYSCALL(landlock_restrict_self);
>  
>  /* mm/fadvise.c */
>  COND_SYSCALL(fadvise64_64);
> +COND_SYSCALL_COMPAT(fadvise64_64);
>  
>  /* mm/, CONFIG_MMU only */
>  COND_SYSCALL(swapon);
> 
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