linux-kernel - Re: [PATCH v6 6/9] futex: Wire up get_robust

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Message-ID: <87jyzgikla.ffs@tglx>
Date: Sun, 23 Nov 2025 21:02:09 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Arnd Bergmann <arnd@...db.de>, kernel test robot <lkp@...el.com>,
 André
 Almeida <andrealmeid@...lia.com>, Ingo Molnar <mingo@...hat.com>, Peter
 Zijlstra <peterz@...radead.org>, Darren Hart <dvhart@...radead.org>,
 Davidlohr Bueso <dave@...olabs.net>, Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>, Waiman Long <longman@...hat.com>, Ryan Houdek
 <Sonicadvance1@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, linux-api@...r.kernel.org,
 kernel-dev@...lia.com
Subject: Re: [PATCH v6 6/9] futex: Wire up get_robust_list2 syscall

On Sun, Nov 23 2025 at 20:19, Arnd Bergmann wrote:
> On Sun, Nov 23, 2025, at 19:47, Thomas Gleixner wrote:
>> On Sat, Nov 22 2025 at 14:49, kernel test robot wrote:
>>> kernel test robot noticed the following build warnings:
>>>
>>> [auto build test WARNING on c42ba5a87bdccbca11403b7ca8bad1a57b833732]
>>>
>>> url:    https://github.com/intel-lab-lkp/linux/commits/Andr-Almeida/futex-Use-explicit-sizes-for-compat_robust_list-structs/20251122-135406
>>> base:   c42ba5a87bdccbca11403b7ca8bad1a57b833732
>>> patch link:    https://lore.kernel.org/r/20251122-tonyk-robust_futex-v6-6-05fea005a0fd%40igalia.com
>>> patch subject: [PATCH v6 6/9] futex: Wire up get_robust_list2 syscall
>>> config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20251122/202511221454.rsysOoSt-lkp@intel.com/config)
>>> compiler: arc-linux-gcc (GCC) 15.1.0
>>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251122/202511221454.rsysOoSt-lkp@intel.com/reproduce)
>>>
>>> If you fix the issue in a separate patch/commit (i.e. not just a new version of
>>> the same patch/commit), kindly add following tags
>>> | Reported-by: kernel test robot <lkp@...el.com>
>>> | Closes: https://lore.kernel.org/oe-kbuild-all/202511221454.rsysOoSt-lkp@intel.com/
>>>
>>> All warnings (new ones prefixed by >>):
>>>
>>>>> <stdin>:1627:2: warning: #warning syscall get_robust_list2 not implemented [-Wcpp]
>>> --
>>>>> <stdin>:1627:2: warning: #warning syscall get_robust_list2 not implemented [-Wcpp]
>>
>> Lacks a COND_SYSCALL()
>
> No, it's actually
>
> scripts/syscall.tbl
>
> that is missing, which means that the newer architectures
> are missing the update. This used to be include/uapi/asm/unistd.h,
> which still exists but is now unused.

So it's both. That syscall depends on CONFIG_FUTEX, which means
COND_SYCALL() is required and it's actually added in patch 9/9 while 5/9
which adds the set() variant adds it right away :)

Thanks,

        tglx