Re: [PATCH RFC v3 2/8] syscalls: Create unified partial table for all archs

["André Almeida" <andrealmeid@igalia.com>]

Em 07/08/2026 17:40, Arnd Bergmann escreveu:
> On Fri, Aug 7, 2026, at 21:34, André Almeida wrote:
>> To take advantage of the subset of syscall numbers that are guaranteed to
>> be shared, create a new table and adapt generation scripts to use it. In
>> that way, every new syscall can be added to a single file.
>>
>> Create special ABIs in order to make the table work for different archs:
>>
>>   - `memfd_secret` for archs that implements it
> 
> This was already there, so it's not really a new addition. We could
> also avoid this entirely and just rely on the stub implementation
> from kernel/sys_ni.c for those architectures that don't need it.
> They still get the macro definition, but it should be fine to define
> that for everyone.
> 
>>   - `cln3` for archs that use the common clone3 entry
>>   - `__cln3` for archs that use their own special entry point
> 
> I guess that's one way to do it. I would probably use the full
> clone3/__clone3 name here for consistency.
> 
>> Some archs only care about the native entry point and have no compat, so
>> create a option to never generate __SYSCALL_WITH_COMPAT() and always
>> generate __SYSCALL().
> 
> I don't see the purpose of this and would prefer to not add that
> extra option if the scripts works fine without it.
> 

Some archs don't define __SYSCALL_WITH_COMPAT() (see x86_64 for 
instance), so that's why I have added this option. But I can define 
__SYSCALL_WITH_COMPAT() as SYSCALL(nr, native) for those archs.

>>   usage() {
>> -	echo >&2 "usage: $0 [--abis ABIS] [--emit-nr] [--offset OFFSET]
>> [--prefix PREFIX] INFILE OUTFILE" >&2
>> +	echo >&2 "usage: $0 [--abis ABIS] [--emit-nr] [--offset OFFSET]
>> [--prefix PREFIX] [--common-tbl] INFILE OUTFILE" >&2
> 
> This needs to be changed to include the argument of common-tbl
> 
>> diff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh
>> index c4b1f85c2dd6..c0fd6af2d892 100755
>> --- a/scripts/syscalltbl.sh
>> +++ b/scripts/syscalltbl.sh
>> @@ -16,18 +16,23 @@
>>   set -e
>>
>>   usage() {
>> -	echo >&2 "usage: $0 [--abis ABIS] INFILE OUTFILE" >&2
>> +	echo >&2 "usage: $0 [--abis ABIS] [--common-tbl] [--no-compat] INFILE
> 
> same here
> 
>       Arnd