[PATCH RFC v2 0/2] arm64: vdso: Implement __vdso_futex_robust_try_unlock()

[André Almeida]

Hi Sebastian,

Em 28/04/2026 08:00, Sebastian Andrzej Siewior escreveu:
> On 2026-04-24 15:55:59 [-0300], André Almeida wrote:
>> Hi folks,
> Hi,
> 
>> This is my take on implementing the new vDSO for unlocking a robust futex in
>> arm64. If you don't know what's that, Thomas wrote a good summary,
>> including the motivation for this work and the x86 implementation:
>>
>>     https://lore.kernel.org/lkml/878qb89g7b.ffs@tglx/
>>
>> There are some loose ends in my patchset so I'm sending as a RFC to ask
>> some questions:
>>
>>   - If the process is interrupted between the labels, we need to check the
>>   conditional flags and clear the op_pending address from the register. Using
>>   objdump I see that op_pending addr is being stored at x2, but I suspect that
>>   this isn't stable, so I need to figure out how to make sure that the address
>>   will always be stored in the same register.
>>   - So far I have implemented only the LL/SC version to make review easier, but I
>>   can do the LSE version as well.
> 
> I am a bit behind here. In the meantime, were you able to check it with
> 	https://lore.kernel.org/all/20260404093939.7XgeW_54@linutronix.de/
> ?
Sorry for my delay. Yes, I had to do some modifications for the test 
(will reply to your patch) and spot one error in my patch, and now the 
test passes, thanks! Will send a v3 for this soon.