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

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Message-Id: <326957b0-fbce-4850-a8fb-8eed90fc4fae@app.fastmail.com>
Date: Sun, 23 Nov 2025 20:19:23 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Thomas Gleixner" <tglx@...utronix.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 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.

     Arnd