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

[Randy Dunlap]

On 8/13/22 10:03, Conor.Dooley at microchip.com wrote:
> 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.

It's in Andrew's mm-hotfixes-unstable branch AFAIK.

Thanks.

>>
>> 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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-- 
~Randy