linux-kernel - Re: [PATCH v2] fuse: uapi: use UAPI types

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Message-ID: <97ed3c52-ca12-4edb-8a3a-acc99c23857c@bsbernd.com>
Date: Thu, 8 Jan 2026 23:14:39 +0100
From: Bernd Schubert <bernd@...ernd.com>
To: Arnd Bergmann <arnd@...db.de>,
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fuse: uapi: use UAPI types



On 1/5/26 13:09, Arnd Bergmann wrote:
> On Mon, Jan 5, 2026, at 09:50, Bernd Schubert wrote:
>> On 1/5/26 09:40, Thomas Weißschuh wrote:
>>> On Sat, Jan 03, 2026 at 01:44:49PM +0100, Bernd Schubert wrote:
>>>
>>>>> libfuse3.so.3.19.0.p/fuse_uring.c.o -c
>>>>> ../../../home/runner/work/libfuse/libfuse/lib/fuse_uring.c
>>>>> ../../../home/runner/work/libfuse/libfuse/lib/fuse_uring.c:197:5: error:
>>>>> format specifies type 'unsigned long' but the argument has type '__u64'
>>>>> (aka 'unsigned long long') [-Werror,-Wformat]
>>>>>   196 |                 fuse_log(FUSE_LOG_DEBUG, "    unique: %" PRIu64
>>>>> ", result=%d\n",
>>>>>       |                                                       ~~~~~~~~~
>>>>>   197 |                          out->unique, ent_in_out->payload_sz);
>>>>>       |                          ^~~~~~~~~~~
>>>>> 1 error generated.
>>>>>
>>>>>
>>>>> I can certainly work it around in libfuse by adding a cast, IMHO,
>>>>> PRIu64 is the right format.
>>>
>>> PRIu64 is indeed the right format for uint64_t. Unfortunately not necessarily
>>> for __u64. As the vast majority of the UAPI headers to use the UAPI types,
>>> adding a cast in this case is already necessary for most UAPI users.
> 
> Which target did the warning show up on? I would expect the patch
> to not have changed anything for BSD, since not defining __linux__
> makes it use the stdint types after all.

Sorry for late reply, default Ubuntu x86_64 target.